The left ventricle in mammals is more muscular than the right ventricle because
A. the right ventricle only pumps blood into the right atrium.
B. the left ventricle has to pump blood throughout the body at high pressure.
C. the left ventricle pumps more total blood than the right ventricle.
D. the left ventricle is always contracting to maintain a systemic blood pressure.
E. the left ventricle pumps blood with a higher hematocrit than the blood that leaves the right ventricle.
Clarify Question
What is the key concept addressed by the question?
What type of thinking is required?
Gather Content
What do you already know about the mammalian heart? What other information is related to the question?
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
B. the left ventricle has to pump blood throughout the body at high pressure.
Clarify Question
What is the key concept addressed by the question?
· This question is asking about the asymmetry of the ventricles of a mammalian heart.
What type of thinking is required?
· Apply level:
o You are being asked to take what you already know and use, or apply, it to the size difference of the right ventricle and left ventricle of a mammalian heart.
Gather Content
What do you already know about the mammalian heart? What other information is related to the question?
· Deoxygenated blood returns to the right atrium of the heart.
· The right atrium forces blood into the right ventricle.
· The right ventricle pumps deoxygenated blood to the lungs, where it can receive oxygen.
· Oxygenated blood returns to the left atrium of the heart.
· The left atrium pumps blood into the left ventricle.
· The left ventricle pumps oxygenated blood to the tissues of the body.
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
· The force that is required to pump blood to the lungs is much less than the force needed to pump blood to the extremities of the body.
· The left ventricle has a much thicker muscle layer because it pumps blood a much greater distance.
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
· Apply level:
o Answering this question correctly depended on your ability to use the mammalian heart in a new situation. If you got an incorrect answer, did you remember that the right side of the heart pumps blood to the lungs, or that the left side of the heart pumps blood much further, to the extremities of the body? Did you have trouble extending the mammalian heart to determine the correct answer?
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