Chapter 49 – The Circulatory System
24. What is true about the lymphatic system?
25. The cells that normally lack a nucleus and have a relatively short life span in humans are
26. Under what circumstance would your body experience an increase in erythropoietin
secretion?
Chapter 49 – The Circulatory System
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 erythropoietin? 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?
Chapter 49 – The Circulatory System
27. What class of sensory receptors directly affects the activity of the cardiac center in
the medulla oblongata?
28. Scientists believe that the heart of the common (chordate) ancestor of all vertebrates
29. When submerged, frogs receive most of their O2 from capillaries within the skin. What
structure would contain blood with the highest O2 concentration in a submerged frog, which is
not able to breathe using its lungs?
Chapter 49 – The Circulatory System
49–24
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 path of blood through an amphibian? 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?
Chapter 49 – The Circulatory System
30. The left ventricle in mammals is more muscular than the right ventricle because
Chapter 49 – The Circulatory System
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?
Chapter 49 – The Circulatory System
31. What would happen if your SA node and AV node fired at same time?
Chapter 49 – The Circulatory System
49–28
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 SA and AV nodes? What other information is related
to the question?
Choose Answer
Chapter 49 – The Circulatory System
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?
Chapter 49 – The Circulatory System
32. Refer to the diagram below.
What is the correct order of structures in the electrical excitation pathway that generates a
normal heartbeat?
Chapter 49 – The Circulatory System
33. The blood pressure in your brachial artery is at its lowest during
34. Which secreted molecule is LEAST likely to effect a significant change in blood
pressure?
35. What animal group is mismatched with its circulation system type (open or closed)?
Chapter 49 – The Circulatory System
36. What is true about about mammalian red blood cells?
37. In the blood clotting cascade mechanism, which specific enzyme catalyzes the conversion
of fibrinogen to fibrin?
38. One mechanism that some animals use to limit heat loss in cold environments is
Chapter 49 – The Circulatory System
39. Edema is a result of increased interstitial fluid in various tissues of the body. All of the
following are causes of edema EXCEPT
40. The greatest metabolic advantage of a fish’s two-chambered heart is
Chapter 49 – The Circulatory System
49–34
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 effect of exercise on heart rate? 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?