The structural and functional unit of nervous tissue is the

A) dendrite.
B) axon.
C) neuron.
D) nerve.


Answer: C

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology