During a primary response to antigen exposure, all of the following occur except
A) the antigen must activate appropriate B cells.
B) B cells may take time to develop into plasma cells and memory cells.
C) antibody levels do not peak until 1 to 2 weeks after the initial exposure.
D) neutrophils invade the surrounding areas, releasing chemotactic substances.
E) the first immunoglobulins to appear in circulation are of the IgM type.
Answer: D
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A presynaptic (axo-axonal) synapse
A. is any synapse onto a cell body, and they can be either stimulatory or inhibitory. B. is a synapse between an axon terminal and a dendrite that can be either excitatory or inhibitory. C. is a synapse between an axon terminal and another axon's terminal that can be either excitatory or inhibitory. D. is a synapse between an axon terminal and another axon's terminal that is always inhibitory. E. is a synapse between an axon terminal and a dendrite of the same cell, which is always inhibitory.
Groups of cells that are similar in structure and perform a common or related function form a(n) ________
A) tissue B) organism C) organ D) organ system
In the following chemical reaction, what is NaCl?
NaOH + HCl ? NaCl + H2O
The enterogastric reflex serves to ________.
A. inhibit gastric motility when there is chyme in the small intestine B. stimulate acid and enzyme secretion when food enters the stomach C. stimulate intestinal motility when there is food in the stomach D. relax the ileocecal valve when chyme is on its way to the colon E. relax the stomach in preparation for swallowed food