Protection from infection known as species resistance is a result of
A) the lack of suitable environment in the body.
B) the absence of receptors required for microbial attachment.
C) the presence of phagocytes in the tissues.
D) the salty, acidic condition of normal skin.
E) both the absence of necessary receptors and lack of suitable environment in the body.
E
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Which two systems in the human body are devoted exclusively to the regulation of organ function?
A. endocrine and circulatory systems B. respiratory and circulatory systems C. nervous and circulatory systems D. nervous and endocrine systems E. respiratory and nervous systems
Blood returning to the heart enters:
a. a ventricle b. the aorta c. an atrium d. a capillary bed e. all of these
Pouches in the gut wall developed into ____ in
fishes that are ancestral to land vertebrates. a. heart chambers b. the notochord c. lobes of the liver d. lungs e. vocal cords
Aminoglycoside antibiotics ________.
A. inhibit cell wall synthesis B. inhibit folic acid biosynthesis C. bind to bacterial DNA polymerase D. bind to the 30S ribosomal subunit