Morphine mimics natural pain killers called _____
Fill in the blank(s) with correct word
endorphins
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Which two structures of the human digestive tract can be classified as endocrine glands since they
produce hormones?
a. liver and gallbladder b. liver and pancreas c. liver and small intestine d. pancreas and small intestine e. pancreas and stomach
Counting the number of individuals in __________ is
a way to estimate the density of a population in a specified area. Fill in the blank(s) with the appropriate word(s).
Autoimmunity is a(n):
a. automatic response to an antigen. b. failure of self cell recognition. c. reaction to environmental antigens. d. normal response to infection. e. response between the autonomic nervous system and the immune system.
Photosynthesis occurs in _______.
a. plants b. bacteria c. protists d. all of these