When the summed total of postsynaptic potentials rises above threshold, creation of action potentials occurs
a) in the synaptic cleft.
b) in the dendrites.
c) at the trigger zone.
d) in the neuron nucleus.
e) in the neuroplasm.
c
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If insufficient oxygen is available for the anaerobic breakdown of pyruvate, it is converted to _________
Fill in the blank with correct word.
While sitting at your desk, you drop your pencil onto the floor. You bend over to pick up the pencil. In order to straighten up and continue your exam, you must use which of the following muscles?
A. Tibialis anterior B. Erector spinae C. Semimembranosus D. Tibialis anterior and semimembranosus E. Extensor hallucis longus
Water is an excellent solvent because
A) it dissolves all solutes. B) water molecules covalently bond with atoms in other molecules. C) it has a high heat capacity. D) it makes up a major part of every cell. E) water molecules are polar.
The respiratory mucosa:
a. lines most of the air distribution tubes b. includes the wall of the alveoli c. includes the wall of the capillaries surrounding the alveoli d. both B and C above