The ________ are in the visual pathway and mediate the pupillary light reflexes.
Fill in the blank(s) with the appropriate word(s).
pretectal nuclei
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Which of the following statements about thermoregulation is correct?
a. in a cold environment, the body will lose heat by conduction, convection, radiation, and evaporation. b. in a hot environment when the temperature of the environment exceeds that of the skin surface, evaporation is the only means for the body to lose heat. c. the temperature control centers in the hypothalamus receive afferent input from peripheral thermoreceptors in the skin and central thermoreceptors in the hypothalamus and internal organs. d. both (b) and (c) above. e. all of these answers.
What tunic is the thickest in veins?
a. tunica media b. tunica intima c. tunica externa
Different T-cell receptors can respond to different antigens because of different
A. complement binding sites in the receptors. B. variable regions in the structure of the receptors. C. antigenic determinants. D. epitopes in the receptor's structure. E. selection processes.
Which of the following fetal shunts connects the umbilical vein with the inferior vena cava?
A. ductus arteriosus B. umbilical vein C. umbilical artery D. ductus venosus E. foramen ovale