In mammals, heart size tends to be proportional to body weight while heart rate is inversely proportional to body weight. What is the most probable explanation for pygmy shrews having unusually large hearts but an unusually slow heart rate?
a. Pygmy shrews are very active so they need large hear...
In mammals, heart size tends to be proportional to body weight while heart rate is inversely
proportional to body weight. What is the most probable explanation for pygmy shrews having
unusually large hearts but an unusually slow heart rate?
a. Pygmy shrews are very active so they need large hearts.
b. It is possible that the heart rate of shrews has reached its absolute limitation, so a large heart can
pump more blood with each beat.
c. Since pygmy shrews are tiny, their heart size differs from other mammals and their heart rate is
slow when they are at rest.
d. The heart size of pygmy shrews varies, depending on latitude. - ANSWERb. It is possible that the
heart rate of shrews has reached its absolute limitation, so a large heart can pump more blood with
each beat.
Which of the following is NOT one of the essential components of a circulatory system?
a. a pump
b. a system of tubes
c. a fluid
d. oxygen - ANSWERd. oxygen
Which of the following fluids is NOT circulated by the cardiovascular system?
a. plasma
b. blood
c. hemolymph
, d. lymph - ANSWERd. lymph
How does the dorsal blood vessel of the earthworm pump blood?
a. contractile skeletal muscle surrounding the vessel
b. peristalsis
c. contractile chamber
d. It doesn't pump blood. Blood flow is positive. - ANSWERb. peristalsis
How many hearts does an octopus have?
a. 1
b. 2
c. 3
d. 4 - ANSWERc. 3
The general term for blood vessels that carry blood away from the heart is:
a. aorta.
b. artery.
c. vein.
d. atrium. - ANSWERb. artery.
Tetrapods have two circulatory circuits within their circulatory system. The one that pushes blood
through the lungs is called the:
a. pulmonary circuit.
b. systemic circuit.
c. capillary circuit.
d. aortic circuit. - ANSWERa. pulmonary circuit.
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