volcanoes
EXPLORATION AND DISSECTION OF A MAMMALIAN HEART In this experiment, we obtained a fresh heart and dissected it to examine andobserve the different parts of the heart, as well as studying how they function and workProblem: How can we study the heart through dissection? The most basic function of the circulatory system is to move the blood. Theorgan that provides the force to push the blood through the vessels is the heart. Themammalian heart is composed of four chambers to which large blood vessels areconnected. The walls of these chambers are made of cardiac muscle tissue. It is the contraction of these muscular walls in a synchronized manner that moves the bloodthrough this pump and its connected vessels. Valves are present in several locations,where they function to maintain a indirectional flow of blood. By doing this experiment, we will gain an understanding of the complexity of a
This blood iscoming back from the body tissues. 7) Why is it essential to the function of the cuspid valves that the muscles attached tothem be so well developed? These valves must prevent back-flow of blood in the heart. Thiscontracts also and makes the blood flow out of the left ventricle, into the aorta, whileblood flows into the pulmonary artery from the right ventricle. 10) What actually occurs in the heart that results in a myocardial infarction (heartattack)? A large deposit of fatty material in the artery largely reduces the size of the spacewhere blood flows through, and so blood cannot flow naturally through. The blood that is returning from the lungs entersthe left atrium. Materials: mammalian heart, glass probe, dissecting pan, single-edged razor blade,dissecting needle, scalpel, absorbent paper towelProcedure & Results: Refer to lab sheets!Discussion Questions: 1) Describe the function of each of the four heart chambers. The atria contracts, and causes the ventricles to fill with blood. During systole, the atrioventricular valves are closed as a result of thecontraction of the ventricles, while the semilunar valves are open. 11) Trace the path of a blood cell from the time it enters the heart from the vena cavauntil it leaves through the aorta. Bibliography blood cells-1992 by herman doy. This controls the blood flow in and out of the heart. The cuspid valves close, andthe semilunar valves open, when systole begins. We will also learn about our own hearts, because besides the size, mammalian hearts are all very similar. From there, it can reach all parts of thebody. 6) How is the pulse related to ventricular contraction (systole)? The pulse is caused by the constant flexing.
Common topics in this essay:
Discussion Questions,
HEART Abstract,
mammalian heart,
Results Refer,
blood flow,
cuspid valves,
blood cell enters,
blood flows,
ventricular contraction systole,
cell enters,
contraction ventricles,
heart chambers,
simultaneous contraction,
chambers blood,
vena cava,
|
Acceptance Essays
