Once cytotoxic T cells are produced, which of the following is (are) consistent with their ability to attack intracellular viruses?
A. Most nucleated cells process antigens through the MHC class I mechanisms.
B. Viral antigens are processed by the MHC class I mechanism and are presented to the cell surface.
C. Cytotoxic T cells bind to MHC class I processed antigens.
D. Cytotoxic T cells bound to the MHC class I processed antigens release lymphokines.
E. All of these choices are correct.
E
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The somatic nervous system and the autonomic nervous system are part of both the peripheral nervous system and the central nervous system
Indicate whether this statement is true or false.
The thirst center in the hypothalamus is stimulated by _____ of the extracellular fluid,
and is inhibited by _____. A) an increase in the osmotic pressure; distension of the stomach by water B) a decrease in sodium ions; an increase in sodium ions C) nerve impulses from the cerebrum; nerve impulses from the thalamus D) a decrease in the osmotic pressure; stimulation of osmoreceptors
A muscle twitch is ________
A) the maximal force a muscle can generate B) a single contraction of skeletal muscle C) an action potential in a muscle D) a twinge that one feels in an isolated muscle
Which autonomic plexus innervates viscera within the pelvic region?
A. Pulmonary plexus B. Cardiac plexus C. Esophageal plexus D. Hypogastric plexus E. Abdominal aortic plexus