Which of the following statements about the female sexual cycle is FALSE?
a) It is controlled primarily by a spinal cord reflex
b) The parasympathetic nervous system causes lubrication of the vagina
c) The sympathetic nervous system causes vasodilatation of the vagina and clitoris
d) Both a and b are false
e) Both b and c are false
Answer: c) The sympathetic nervous system causes vasodilatation of the vagina and clitoris
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All cells in our body (e.g., a neuron or muscle cell) possess a type of protein that the immune system uses to identify them as our own cells. This protein is
A. CD4. B. lactoferrin. C. MHC I. D. MHC II. E. antigen.
Receptors for peptide hormones lie
A. in the cytoplasm. B. in the nucleus of the cell. C. within the cell membrane. D. in association with ribosomes in the cytoplasm.
A primary immune response is the ________
A) production of primary-type antibodies in the first day of exposure to a microorganism
B) immune response elicited by the second exposure of lymphocytes to a particular antigen
C) immune response elicited by the first exposure of lymphocytes to a particular antigen
D) immune response elicited by the first exposure of memory cells to a particular antigen