What type of cell is activated in lymphatic tissue by macrophages presenting antigens during a viral infection?
A) helper T (TH) cell B) plasma cell
C) natural killer (NK) cell D) memory B cell
Answer: A
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The posterior root ganglia mainly contain
A) axons of motor neurons. B) axons of sensory neurons. C) cell bodies of motor neurons. D) cell bodies of sensory neurons. E) synapses.
The amplitude of an action potential depends in part on the amount of sodium in the extracellular fluid. Stanley Student has carefully impaled a neuron with an intracellular electrode. He tests the role of extracellular sodium by changing the concentration in the bathing fluid and recording an action potential after each change. The data he generated are shown in the table, where amplitude listed
is the peak amplitude of the action potential; make an appropriate graph.
Na+ is best known as a(n):
A) macromolecule. B) ion. C) molecule. D) compound.
________ is an example of the cooperative effect between the two autonomic nervous system divisions.
A. Vasomotor tone B. Bronchodilation C. Orgasm D. Gastrointestinal secretion E. Heart rate