Movement of nutrients, wastes, and organelles between the cell body and axon terminals is called
A) osmosis.
B) diffusion.
C) axonal transport.
D) axoplasmic transport.
E) neurofibular contraction.
D) axoplasmic transport.
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Eyebrow hairs are always shorter than hairs on your head because ________
A) eyebrow follicles are only active for a few months B) hormones in the eyebrow follicle switch the growth off after it has reached a predetermined length C) they grow much slower D) the vascular supply of the eyebrow follicle is one-tenth that of the head hair follicle
Which of the following hormones is important in the regulation of sodium ion concentrations in the extracellular fluid?
A) antidiuretic hormone B) erythropoietin C) aldosterone D) renin
Metabolism is defined as _____
A) the taking in of nutrients B) all the chemical reactions occurring in an organism that support life C) the breakdown of substances into simpler forms D) the removal of wastes produced by chemical reactions
The sensitivity of the muscle spindle is maintained by ________.
A. alpha motor neurons B. gamma motor neurons C. a stretch reflex D. secondary afferent (group II) fibers E. anulospiral endings