You are taking a lab practical exam, and one station has pins in various internal structures of a bisected mammalian heart. You can orient yourself without picking up and examining the exterior of the heart because
A. the width of the external wall of the right ventricle is thicker than all the other chamber walls.
B. the width of the external wall of the left ventricle is thicker than all the other chamber walls.
C. the width of the external wall of the left atrium is thicker than all the other chamber walls.
D. the width of the external wall of the right atrium is thicker than all the other chamber walls.
E. the ascending aorta exits from 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 structure of 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 width of the external wall of the left ventricle is thicker than all the other chamber walls.
Clarify Question
What is the key concept addressed by the question?
· This question is asking about the cause of the asymmetry of the 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 external appearance of the heart.
Gather Content
What do you already know about the structure of the mammalian heart? What other information is related to the question?
· The heart of a mammal has three layers.
· The most variable layer is the middle layer, which composed of muscle.
· The heart of a mammal has four chambers.
· The upper chambers are the atria.
· The atria push blood into the ventricles.
· The lower chambers are the ventricles.
· The right side of the heart pumps blood to the lungs and back.
· The left side of the heart pumps blood to the extremities and back.
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
· Since the atria on the left and right side of the heart do the same thing, their size is similar.
· The aorta exits from the left ventricle, not the right ventricle.
· The left ventricle is much thicker than the right ventricle, which can be seen externally and can be used to identify the sides of the heart.
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 structure of a mammalian heart in a new situation. If you got an incorrect answer, did you remember that the left side of the heart sends blood to the tissues of the body, or that doing so requires a thicker layer of muscle? Did you have trouble extending the structure of the mammalian heart to determine the correct answer?
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