The structural and functional unit of nervous tissue is the
A) dendrite.
B) axon.
C) neuron.
D) nerve.
Answer: C
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What is the primary function of the transverse tubules?
A. Conduct action potentials from the surface of the muscle fiber to internal regions near myofibrils. B. Act as a channel for Ca2+ ions during excitation-contraction coupling. C. Form cross-bridges between actin and myosin during muscle contraction. D. Attach troponin to tropomyosin. E. Attach muscle fibers to skeletal elements to exert force.
What are the characteristics of hemoglobin? Check all that apply.
_____ It is a large protein. _____ It has four subunits. _____ It binds four O2 molecules cooperatively. _____ O2 is bound to the heme group that contains an iron atom. _____ It has an O2 binding group that includes a copper atom.
The occurrence of an action potential can best be compared to a
a. switch to turn a lamp on and off. b. volume control on a stereo. c. door to a classroom. d. room light dimmer switch. e. gradually inclined ramp.
The extreme loss of genetic diversity that has occurred in cheetah populations due to overhunting is the result of
A) coevolution. B) a population bottleneck. C) genetic drift. D) the founder effect. E) natural selection.