Which neuronal structure has the greatest density of voltage-gated Na+ channels, resulting in the lowest threshold
potential along a neuron?
a. dendrites
b. cell body
c. axon hillock
d. axon
e. axon terminals
ANSWER: c
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Air movement to the mammalian respiratory surfaces can be reduced when smooth muscle in the walls of the ____
a. epiglottis b. bronchioles c. large bronchi d. trachea e. aorta
Define the following terms: • Estuary • Tidal flat • Salt-wedge estuary
What will be an ideal response?
These joints have bones joined by stiff fibers of connective tissue and are essentially immobile
a. synovial joints b. cartilaginous joints c. fibrous joints d. non-synovial joints e. non-fibrous joints
The semen from a man who has had a vasectomy would include each of the following except ________
A) sperm B) secretions from the prostate gland C) secretions from the bulbourethral glands D) secretions from the seminal vesicles