Muscle spindles
A. originate in the spinal cord.
B. are specialized nerve cells.
C. are innervated by alpha motor neurons.
D. are found encapsulated in nerve endings.
E. are innervated by gamma motor neurons.
Answer: E
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Capillary beds are composed of two types of blood vessels: ________ and ________.
A. arterioles; venules B. a vascular shunt; true capillaries C. tunica media; tunica externa D. lumens; valves
The primary role of the carbonic acid-bicarbonate buffer system is to
A) buffer stomach acid. B) buffer carbonic acid formed by carbon dioxide. C) limit pH changes caused by organic and fixed acids. D) buffer the urine. E) increase ventilation.
Accelerated closure of the epiphyseal plates could be caused by
A) high levels of vitamin D. B) too much calcium in the diet. C) elevated levels of estrogen. D) too little thyroxine. E) an excess of growth hormone.
Which of the following statements is/are true?
A. Pennate muscles are capable of producing more tension per unit of cross-sectional area than parallel muscles. B. Parallel muscles are capable of producing more range of motion than pennate muscles. C. Both A and B are true. D. Neither A nor B is true.