11|1175275919|1. there are different phases to the fetal heart's development. at first, the heart is just a tube. as it grows, it needs more space, so it bends and twists. |Courtney T|basicallymee@yahoo.com|no|
21|1175603850|What are the major structural differences between the fetal and the adult human heart? ~nl~~nl~During the first weeks of conception the fetal heart occupies most of the mid section. The ratio of heart to body size is nine to one. The heart than moves down to occupy the lower chest cavity. It starts out as a tube that then bends and twist back forming the recognizable shape. First two artria begin to form and there is one large ventricle. Then the artria sepertate and the one ventricle splits into two. This forms the fetal heart. ~nl~~nl~~nl~~nl~ How do these structures alter the circulation of blood? ~nl~Why is the pulmonary circulation reduced in the human fetus? ~nl~Are heart rates of 130 to 160 normal in a human fetus? |Madhav Chopra||no|
7|1175275618|Since a human fetus is not breathing like a baby outside of the womb, the circulation of blood to and from the lungs is reduced.~nl~~nl~The main structural difference between the fetal and adult heart is the thickness of the ventricular walls. In a fetus, the right ventricular wall is thicker than the left because the right ventricle has been working harder, but after birth, the left wall becomes stronger due to a change in workload. Also, the walls of the pulmonary arteries in a fetus’ heart are thicker than an adults because the walls thin as the lungs expand for the first few times.~nl~~nl~A fetus’s heart rate is unusually above 120 beats per minute, so a rate between 130 and 160 is perfectly normal. A baby’s blood pressure drops once the placenta ceases to supply the baby with its nutrients.~nl~|Kristin F|IreLe3@aol.com|yes|
2|1175103455|Fetal hearts start off as just a tube that is all twisted up. There is also the umbilical chord that runs blood in from the mother. In adult hearts blood froms from atrium to ventricle. The pulmonary circulation in a human fetus is reduced because the lungs are collapsed. Heart rates are much higher in a human fetus than in an adult, almost double. 130-160 is normal.|Kristen S. ||yes|
17|1175519303|1. The right and left artiums pump blood to eachother through the foramen ovale. The right and left ventricle arr not fully developed yet. Blood is blocked from flowing through the pulmonary veins.~nl~~nl~2. The fetus doesn't breathe oxygen yet so the lungs are not used. So blood doesn't get pumped through the pulmonary veins and into the lungs.~nl~~nl~3. Yes|Sam||yes|
22|1175604427|The Fetal Heart starts out as a tube and then twists and bends back. It then has two atria and one large ventricle. Then the atria split and the ventricle splits as well. The two feature that a fetal heart has is the Ooval foramen which allows oxygenated blood from the placenta to enter the left atrium. There is also the ductus arteriosis which is a bypass so deoxygenated blood doesn't go to the lungs but rather to the placenta. In duct dependent heart disease closing the duct may cause bluenesses due to a lack of oxygen.                                                     ~nl~Pulmonary circulation is reduce because a fetuses lungs don't function because it is dependent on the moter for oxygen. ~nl~~nl~The average heart rate for a fetus is 120 beats a minute this slows down to 90 for children and about 70 for adults at 18.   |Madhav Chopra||no|
1|1175102193|1. The difference is fetal hearts have the foramen ovale which lets blood flow directly from the right atrium to the left atrium during fetal development, but it also closes after birth. So the ductus arteriosus and the foramen ovale are part of the fetal circulatory system before birth but disappear soon after birth. This alters the flow of blood by not after fetal stage haveing the blood flow from the right atrium to the left atrium directly.~nl~2. In the fetus, there is an opening between the right and left atrium (the foramen ovale), and most of the blood flows from the right into the left atrium, thus bypassing pulmonary circulation.~nl~3. Norm heart rates in a human fetus is usually 120-160.|Charles S||yes|
18|1175520200|1. The fetal heart does not have to pump blood to the lungs for oxygen when inside the mother and adults do.  Thus resulting in a lack of seperate aorta and pulmonary artery.~nl~2. Because transfer of oxygen comes from the mothers placenta to the baby through the umbilical cord, the pulmonary artery is bypassed and blood is shunted to the aorta through the ductus arteriosus.~nl~3. Yes they are fairly normal. Usual heart rate is about 130-160 so they are fine.|Andy||yes|
23|1175613069|Beginning from a group of mesodermal cells, the fetal heart is not as physically developed in comparision to the adult heart. Twisting together and combining, the cells create a basic heart, composed of the aorta, pulmonary vein, atriums, and ventricles. But, one must understand these are weak and not yet completely sectioned off to independently pump blood through the body. Without th einterventricular septum and interatrial septum to form walls between atriums and ventricles, the fetus must rely on the mother to stay alive. Through her ambilical cord, the child is connected with not only food supply, but also blood as well.~nl~~nl~The pulmonary circulation is reduced in the fetus due to the lack of complete blood flow. The entire heart is not yet fully developed to handle the deoxygenated blood, because the baby is not breathing in oxygen. They are living in the womb of the mother, floating around in her bodily fluids, not yet breathing, and therefore not need to oxygenate the blood.~nl~~nl~It is normal for fetuses to have a heart rate of 100-160.|Sam K|sammyjo44@sbcglobal.net|no|
13|1175275987|1. In the human heart, the chambers are more developed; opposed to the fetal heart which instead starts as tubes. In the adult the blood flow goes through the pulmonary artery - however in the fetal heart there is a valve.~nl~~nl~2. The circulation in the fetus is reduced because the lungs are not developed yet - thus it has to find another way to pulmonary circuit.~nl~~nl~3. Nope - normal is 120|Tracy|trisaliti@neo.rr.com|yes|
16|1175301205|1. As seen in the answer to question two, there is an opening between the left and right atrium that the blood goes through. The hole is called foraman ovale. This cuts down on the circulation. This changes after birth. Other differences are a different type of hemoglobin and structural differences such as ductus venosus, and other branches. All these change after birth.~nl~~nl~2.Because of the placenta and umbilical cord, the circulatory system is different for a fetus. The blood flows by the umbilical cord and to the different parts of the heart. The difference that changes the pulmonary circulation is that in the fetus, there is an opening between the right and left atrium and most of the blood flows from the right into the left atrium, and bypasses pulmonary circulation. So it is greatly reduced.~nl~~nl~3.The range is kind of high, but okay. The heart actually has several ranges as it forms. It starts beating 21 days after conception and beats at a rate near the mother's rate. The rate then accelerates to 165-185 beats per minutes during the early seventh week. The rate peaks about 10 weeks after conception. It then decreases to about 150 BPM and by the time of this situation the heart rate would be about 145, give or take 25 beats per minutes. So this range is reasonable.~nl~|Teale||yes|
25|1176778069|Foramen ovale and ductus arteriosus...~nl~The foramen ovale lets the blood go from the right atrium to the left and then ductus arteriosus allows the blood to go from pulmonary atery to aorta.~nl~They bypass the pulmonary artery because they do not need own supply of oxygen.~nl~Yes- the normal heart rate for a fetus is usually between 110 and 160 beats per minute|Kelsey M||no|
6|1175275444|#1 the adult heart has more developed chambers than the fetal heart. The fetal heart starts as tubes then develops into chambers as age progesses. A fetal heart contains fewer chambers for blood to flow through than in an adult heart. ~nl~_____________________________~nl~#2 In an adult blood flows from the right atrium to the right ventricle then through the pulmonary arteries to the lungs but in a fetus the lungs are nonfunctional so it bypasses them.~nl~_____________________________~nl~#3 no |mel ||yes|
3|1175186750|1. The heartsize to bodysize ratio is nine times greater in the fetus than in the baby. It starts out looking like a tube, then becomes two-chambered, then three-chambered, and eventually a four-chambered normal sized heart.  In a fetal heart, the lungs are not in use.  The baby gets oxygen and nutrients from the placenta of its mother.  In an adult heart, blood vessels connect to the top of the heart and it flows in two cycles all throughout the body.~nl~~nl~2. In the fetus, there is an opening between the right and left atrium, and most of the blood flows from the right into the left atrium, thus bypassing pulmonary circulation.~nl~~nl~3. Yes- the normal heart rate is between 120 and 160 in a fetus.|Kara||yes|
9|1175275634|1. In the womb, the fetus heart is very large compared to the body itself.  It first lies high in the chest, and then drops lower.  The human heart is the size of a fist.  A child's heart rate is high, because they need more oxygen to develope(120-160 in infancy).  As you get older, you heart rate decreases to about 70 bpm at 18 yrs.  ~nl~2. Pulmonary circulation is the cirlce of blood leaving the heart, going to the lungs, and coming back to the heart. The fetal lungs are collapsed, and blood passes from the right atrium directly into the left atrium through the foramen ovale.  When the lungs expand, the blood goes from the right atrium to the right ventricle and through the puliminary circut.  Then, the foramen ovale closes as the child grows.~nl~3. The normal heart rate for a fetus is 120-160 beats per minute.~nl~|Liz P.||yes|
12|1175275947|What are the major structural differences between the fetal and the adult human heart? . ~nl~~nl~1. Ductus arteriosus ~nl~… protects lungs against circulatory overload~nl~… allows the right ventricle to strengthen ~nl~… high pulmonary vascular resistance, low pulmonary blood flow~nl~… carries mostly med oxygen saturated blood~nl~~nl~2. Ductus venosus ~nl~… fetal blood vessel connecting the umbilical vein to the IVC~nl~… blood flow regulated via sphincter~nl~… carries mostly hi oxygenated blood~nl~~nl~3. Foramen ovale~nl~… shunts highly oxygenated blood from right atrium to left atrium ~nl~~nl~How do these structures alter the circulation of blood? ~nl~~nl~The Ductus venosus regulates blood from the umbilical cord to the inferior vena cava.  This supplies all of the fetus' blood. ~nl~The foramen ovale and the ductus venosus all blood to pass from the right atrium to the left atrium.  This needs to be done because the blood is bypassing the pulmonary arteries and veins.  This is the mechanism that allows that.~nl~~nl~Why is the pulmonary circulation reduced in the human fetus?~nl~~nl~   Blood flow is reduced because the only blood that needs to go to the lungs is blood to support those cells.  On the contrary, in a breathing human all of the blood needs to go to the lungs to pick up oxygen for the rest of the body.~nl~~nl~Are heart rates of 130 to 160 normal in a human fetus? ~nl~~nl~   Yes, a normal fetal heart rate is 120-160 beats per minute.|Vince F|vince.frascello@gmail.com|yes|
20|1175572061|1. The fetal heart takes up most of the mid section of the fetus, whereas the adult heart is only in the thoracic cavity. ~nl~The fetal heart begins as a tube, but bends and twists around into the shape it eventually takes that is recognizeable in adult hearts.~nl~The ventricles of the heart are not separated, but when they do, the human heart is finally formed. ~nl~2. The pulmonary circulation of the fetus is reduced because the blood flows much more slowly through the ventricles. Only a little bit of blood is aloud to enter certain parts of the heart, unlike the adult heart. ~nl~3. Yes, the normal heart rate for a fetus is usually between 110 and 160 beats per minute. |Drew |DBole36988@aol.com|yes|
14|1175276173|1.) During the first few weeks after conception, the fetal heart occupies most of the fetus' mid-section. During those first few weeks, the fetal heart lies high in the chest. Soon, it moves down to occupy its position in the chest cavity. The circulation of blood is faster in the fetal heart than in the adult heart. The average adult heart is about the size of a clenched fist and weighs about 11 ounces.~nl~2.) When the lungs expand at birth, the pulmonary pressure drops and blood is drawn from the right atrium into the right ventricle and through the pulmonary circuit. The small size of the fetal heart is responsible for the reduced pulmonary circulation. It is also due to the fact that the fetal heart is still in development.~nl~3.) From about 110- 160 is the normal fetal heart rate, so yes, 130-160 is normal. |Mike R. ||yes|
15|1175283281|1. the human heart is about the size of that human's heart. even at birth, an infant's fist is about the same size as it's heart. in the womb however, the fetal heart goes through stages of growing. it begins as a tubelike structure but as it grows it bends and twists forming what their will actually look like. in the nest stage, the two atria are partly separate and there is one big ventricle. then, the two atria are completely separate and the ventricles begin to separate. then the ventricles separate completely and the heart is fully developed. while still in the womb, the circulation of blood will bypass pulmonary circulation. the blood passes right into each atrium. in an adult human heart, there are four cavities inside the heart that fill with blood. two of the chambers are called atria and the other two are ventricles. the aorta is what mostly circulates blood through the body.~nl~~nl~2. there is an opening between the right and left atrium where most of the blood flows from the right atrium and into the left atrium. which means they skip pulmonary circulation.~nl~~nl~3. the heart rate of a fetus depends on what stage of development they are in. by stage 18 their heart rate can be up to 130 beats per minute and continues to increase as it grows.|Courtney T|basicallymee@yahoo.com|yes|
8|1175275626|1.In fetus the foramen ovale allows most blood entering the right atrium to pass into the left atrium, after birth the foramen ovale closes. Blood flow is from the right atrium to the left atrium due to the fact that the lungs within a fetus are not used, instead it flows from the right atrium through the foramen ovale into the left atrium.~nl~2.The blood flows from the right atrium through the foramen ovale to the left atrium bypassing the ventricles and the lungs. The circulation is reduced because the blood is not being taken through the lungs to gain oxygen, and instead of moving through four chambers in a fetus the blood is only moving through two.~nl~3.Yes, normal heart rate in a fetus is 120-160.|Katrina||yes|
4|1175258739|There are several key structural differences between the fetal and adult human heart.  One of these differences is that a fetus' heart has only two chambers while an adult heart has the traditional 4 chambers in the heart.  Another difference is that after birth, the pulmonary arteries are the only arteries that carry deoxygenated blood.  The different heart structures alter the circulation of blood because in a prenatal fetus, the fetus obtains oxygen and nutrients from and eliminates carbon dioxide and other wastes into the maternal blood.  In a human heart (adult) circulation is done using the organs such as lungs, kidneys, and gastrointestinal organs that have not developed until birth.  The pulmonary circulation carries deoxygenated blood from the right ventricle to the air sacs within the lungs  and returns  oxygenated blood from the air sacs to the left atrium.    ~nl~~nl~The pulmonary circulation is reduced in the human fetus because it has half the chambers the adult heart contains.  The adult heart contains 4 chambers while a fetus only has two chambers.~nl~~nl~Yes, normal heart rates for a human fetus range from 110-160 beats per minute.|Mark||yes|
24|1175698801|The fetus heart has a different structure compared to the heart of an adult due to theblood circulation.  Due to the fetus's underdeveloped lungs, blood isn't as needed as usual. The Foramen ovale allows blood to flow from the right atrium to the left atrium. The Ductus arteriosus allows blood to flow from the pulmonary artery to the aorta. Due to the small size of the unborn fetus, the heart has to do more work than normal so the heart rate of 130-160 is quite normal.~nl~~nl~~nl~|Chaz||no|
10|1175275688|One major structural difference is the foramen ovale; which allows blood to move from the left to the right atrium; avoiding the lungs because the human fetus does not breathe.  The cirulation of the blood then travels in the heart from one atrium to the other and then to the capillaries and blood vessels and back to the heart (only the atriums).~nl~~nl~Because of the foramen ovale, the blood does not travel into the ventricals and is reduced in the pulmonary veins and arteries because the baby does not breathe and therefore the blood does not collect oxygen from the lungs as in an adult.~nl~~nl~A normal human fetus heartbeat is anywhere from 120-160 beats per minute (usually around 100 in the mother's).  There is no real difference of heartbeats between a male fetus and a female fetus.  |Mandi ||yes|
19|1175523962|1. There are 4 chambers in an adult human heart, but in and infant there are different stages where the heart grows from having just one tube and one chamber like a fish to two chambers like a frog heart and then grows to three chambers such as a turtles heart before it reaches the final stage of 4 chambers.  This alters the circulation of blood in the fetus because their heart is so much simpler and isnt as complex yet. ~nl~2. They bypass the pulmonary artery since they do not need to supply their own oxygen.~nl~3. heart rates of 130 to 160 are normal in a fetus.|Mike T||yes|
5|1175275190|1. the fetal heart is has less developed chambers than the adult heart. Starting as tubes, it develops into actual chambers as a person ages. In a fetus, there are less chambers to flow through than in and adult heart. ~nl~~nl~2. In an adult, blood flows from the right atrium to the right ventricle then through the pulmonary arteries to the lungs but in a fetus the lungs are nonfunctional so it bypasses them.~nl~~nl~3. no |tara a||yes|