All hormones
a. are regulated by the hypothalamus.
b. initiate synthesis of new proteins.
c. are secreted by endocrine glands through ducts into the blood.
d. must combine with specific receptors on the target cells in order to exert their effects.
e. are produced in a gland and target cells in different tissues.
E
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Conduction of a nerve impulse would be the fastest in which of the following?
A. A large diameter myelinated fiber B. A small diameter myelinated fiber C. A large unmyelinated fiber D. A small unmyelinated fiber E. A small fiber with multiple Schwann cells
Which of the following is not a component of a reflex arc?
A. Somatic receptors B. Afferent nerve fibers C. Integrating center D. Motor neurons in the cerebral cortex E. Efferent nerve fibers
Mesangial cells help keep the basement membrane clean by
A. secreting emulsifying agents that dissolve trapped particles. B. engulfing macromolecules caught in its basement membrane. C. secreting antibodies that attack the molecules caught in the endothelium. D. opening larger pores in the membrane so that trapped particles move across.
An isometric contraction is described as
A. action potential frequency is high enough that no relaxation of muscle fibers occurs. B. a muscle produces constant tension during contraction. C. a muscle produces an increasing tension as the length remains constant. D. a muscle produces increasing tension as it shortens. E. a muscle produces tension, but the length of the muscle is increasing.