The metabolic pathways of cardiac muscle make it
A. somewhat susceptible to heart attack, because it has so few mitochondria.
B. relatively resistant to heart attack, because it uses exclusively anaerobic metabolism.
C. somewhat susceptible to heart attack, because it relies so exclusively on aerobic metabolism.
D. relatively resistant to heart attack, because it has a great capacity to accrue oxygen debt.
E. extremely susceptible to heart attack, because it uses such a variety of fuel sources.
Answer: C
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A. cancer of the lung. B. decreased number of respiratory capillaries. C. backflow of capillary fluids into the alveoli. D. constriction of the bronchioles.
What is NOT part of the endomembrane system?
A) Golgi apparatus B) peroxisome C) lysosome D) endoplasmic reticulum
The respiratory system is important to the movement of blood, but not the movement of lymph.
Answer the following statement true (T) or false (F)
Blood volume represents about ________ percent of a person's body weight
A) 7 B) 15 C) 2 D) 25 E) 42