Once a helper T-lymphocyte recognizes an antigen, it begins the immune response by secreting chemical signals called
A. memory B-lymphocytes.
B. memory T-lymphocytes.
C. cytokines.
D. immunoglobulins.
E. antibodies.
Answer: C
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When we shiver on a cold day, the heat produced by muscle tissue is a demonstration of
A. radiant potential energy. B. the first law of thermodynamics. C. the second law of thermodynamics. D. the creation of energy.
The right coronary artery typically:
A) supplies both the AV and SA nodes. B) supplies most of the interventricular septum. C) has a circumflex branch. D) passes to the left side of the pulmonary trunk after arising from the right aortic sinus. E) supplies the fibrous pericardium.
In a sexually mature individual, pulses of GnRH are secreted once a day
Indicate whether the statement is true or false
Which organ generates a population of T cells capable of protecting the body from pathogens?
A) thymus B) spleen C) lymph nodes D) tonsils