During a typical immune response, activated B cells mature into cells that produce ________, which bind(s) to and attack(s) foreign invaders.
A) antigens
B) perforins
C) antibodies
D) heparin
E) complement proteins
C) antibodies
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Which of the following choices is FALSE regarding rhabdomeric photoreception?
A) The absorption of light leads to cell hyperpolarization. B) The opsins signal through a Gq protein. C) A phospholipase C signal transduction cascade is activated. D) Diacylglycerol affects the activity of a nonselective cation channel.
Cardiac muscle can be distinguished from skeletal muscle because cardiac muscle:
a. Forms muscle fibers with larger diameters than those of skeletal muscle b. Has 15 to 20 nuclei per muscle fiber (cell) c. Lacks intercalated disks d. Lacks striations e. Possesses a nucleus located in the center of each muscle fiber
Adiponectin is
A) a hormone made in fat tissue and secreted into the circulation, where it affects the response to insulin. B) a hormone secreted into the stomach lining that enhances appetite. C) a hormone made in the hypothalamus that decreases appetite after a fatty meal. D) a nutrient that causes weight gain.
Lymphocytes are
a. polymorphonuclear granulocytes b. the most abundant type of leukocyte c. produced in lymphoid organs as well as in the bone marrow d. both a and b e. all of the above