1 A) stem cells B) chondrocytes C) osteocytes D) fibroblasts E) amoebocytes 2 A) by varying the rate of nerve impulses B) by stimulating different numbers of muscle fibers C) by rapid firing of motor neurons D) by varying the amount of neurotransmitters released E) by antagonistic interactions between muscle cells 3 A) transmit nerve impulses. B) are only found in the central nervous system. C) are only found in the peripheral nervous system. D) are associated with axons and form an insulated covering. E) form ganglia. 4 A) endocrine, circulatory, urinary, respiratory B) immune, endocrine, sensory, circulatory C) digestive, circulatory, urinary, respiratory D) circulatory, urinary, respiratory, reproductive E) circulatory, endocrine, respiratory 5 A) errors in nerve impulses B) different effectors that have opposing actions C) different effectors that have reinforcing actions D) effectors that work in a sequence E) only occur in the musculoskeletal system 6 A) organs. B) organ systems. C) germ layers. D) tissues. E) layers. 7 A) they form a barrier to the entry and exit of substances to and from the body. B) they must be shed regularly. C) they are impermeable to most substances. D) the cells are tightly bound together. E) they form a barrier to the entry and exit of substances to and from the body and the cells are tightly bound together. 8 A) They are comprised of fibers. B) Their cells are widely spaced apart and they contain much extracellular material. C) They occur in layers. D) They originate as embryonic endoderm. E) all of the above 9 A) skeletal and smooth B) skeletal, smooth and cardiac C) skeletal only D) smooth only E) none 10 A) neuroglea B) dendrites, axon C) dendrites, cell body D) cell body, dendrites, axon E) neuroglea, dendrites, axons 11 A) True B) False 12 A) only involves positive feedback mechanisms. B) only involves negative feedback mechanisms. C) maintains internal conditions within narrow limits. D) maintains internal conditions at exact values. E) allows for large variations in values. 13 A) Epithelial B) Connective C) Muscle D) Nervous E) None of these 14 A) Epithelial B) Connective C) Muscle D) Nervous E) None of these 15 A) Hypothalamus. B) Urinary system. C) Circulatory system. D) Integumentary system. E) Digestive tract.
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