What would be the physiological effect of an increase in the venous return to the heart?
A. increased stroke volume
B. decreased cardiac output
C. increased sympathetic stimulation of the heart
D. increased secretion of ADH (vasopressin)
E. decreased secretion of atrial natriuretic hormone
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 blood return to the 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?
A. increased stroke volume
Clarify Question
What is the key concept addressed by the question?
· This question is asking you to describe the effect of increased return of blood to the heart.
What type of thinking is required?
· Apply level (sample phrases, or use your own):
o You are being asked to take what you already know and use, or apply, it to the consequences of an increased return load of blood to the heart.
Gather Content
What do you already know about blood return to the heart? What other information is related to the question?
· The right atrium receives deoxygenated blood from the body.
· Cardiac output (CO) is the amount of blood pumped by a ventricle in one minute.
· CO increases with exercise.
· CO = stroke volume (in ml) x beats per minute
· Stroke volume is equal to the amount of blood that is moved by one ventricular contraction.
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
· Secretion of atrial natriuretic hormone increases with increased blood volume.
· ADH secretion increases when blood volume is low.
· Cardiac output is directly proportional to venous return.
· As more blood returns to the heart, more blood is available to be moved in each ventricular contraction. This is an increase in stroke volume.
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 blood return to the heart in a new situation. If you got an incorrect answer, did you remember that stroke volume is a measure of the blood pumped by a ventricle, or that the blood returning to the heart is directly proportional to stroke volume? Did you have trouble extending blood return to the heart to determine the correct answer?
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