Since each kind of B cell carries its own particular antibody molecule in its cell membrane, activation can only occur in the presence of a(n):
corresponding antigen
immunosuppressive drug
CD3 receptor complex
cytotoxic T cell
None of the choices are correct
corresponding antigen
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During growth, a tissue increases in size by
A) increasing the size of its cells. B) increasing the osmolarity of its tissue fluid to draw in water. C) increasing its rate of cell division. D) dilating blood vessels to increase its blood supply. E) recruiting cells from surrounding tissues.
Twitch summation
a. is a means by which gradation of muscle contraction may be accomplished. b. results from increasing the number of motor units that are firing within a muscle. c. results from increasing the frequency at which motor units are firing within a muscle. d. both (a) and (b) above. e. both (a) and (c) above.
Hypersecretion of the sex hormones may lead to masculinization in both men and women
Indicate whether the statement is true or false
The heart produces a hormone that helps regulate the body's sodium levels and blood pressure.
Answer the following statement true (T) or false (F)