Which layer(s) of the wall of the GI tract contain a nerve plexus?
A. Muscularis only
B. Mucosa and serosa
C. Adventitia only
D. Mucosa and muscularis
E. Submucosa and muscularis
E
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An action potential involves a temporary reversal of polarity across the plasma membrane (that is, the inside of the axon becomes relatively positive compared to the interstitial fluid)
Indicate whether this statement is true or false.
Answer the following statements true (T) or false (F)
1) The expanded portion of the axonal branch that faces a region of the sarcolemma are called synaptic terminals 2) A region of the sarcolemma that faces an expanded portion of an axonal branch is the motor end plate. 3) A space that separates the sarcolemma from the axon membrane is the synaptic vesicle. 4) The cytoplasm of the synaptic knob contains mitochondria as well as vesicles containing acetylcholine. 5) The sarcoplasmic reticulum conducts action potentials from the sarcolemma into the cell.
Resistance increases when
a. vessel radius decreases b. vessel length decreases c. blood viscosity decreases d. red blood cell count decreases e. both a and b occurs
The primary goal of the immune response is
A. stimulation of mitotic activity in order to replace cells damaged by infection. B. maintenance of the proper ionic balance between lymph and blood. C. destruction or inactivation of pathogens and foreign material. D. removal of antibodies from lymph and lymphatic organs. E. reduction of the number of circulating memory lymphocytes.