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) They transmit nerve impulses. B) They eliminate foreign materials in and around neurons. C) They insulate neurons. D) They are associated with axons. E) All selections are correct statements. 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) opposing effectors C) reinforcing effectors D) sequential effectors E) effectors in the musculoskeletal system 6 A) epithelial B) connective C) muscle D) extracellular matrix E) nerve 7 A) muscle B) nerve C) epithelial D) nerve and epithelial 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 selections are correct. 9 A) skeletal and smooth B) skeletal, smooth and cardiac C) skeletal only D) smooth only E) none 10 A) neuroglia B) dendrites, axon C) dendrites, cell body D) cell body, dendrites, axon E) neuroglia, dendrites, axons 11 A) true B) false 12 A) It involves positive feedback mechanisms only. B) It involves negative feedback mechanisms only. C) It maintains internal conditions within narrow limits. D) It maintains internal conditions at exact values. E) It allows for large variations in values. 13 A) epithelial B) connective C) muscle D) nerve E) None of the selections are correct. 14 A) epithelial B) connective C) muscle D) nerve E) None of the selections are correct. 15 A) hypothalamus B) urinary system C) circulatory system D) integumentary system E) digestive system 16 A) convection B) radiation C) reflected sunlight D) conduction E) evaporation 17 A) true B) false 18 A) muscular; sartorius B) skeletal; femur C) endocrine; salivary gland D) digestive; pancreas 19 A) Positive feedback opposes undesirable system changes. B) Oxytocin-caused uterine contractions are an example of negative feedback. C) Negative feedback enhances a negative change in the system. D) There are far fewer positive feedback mechanisms than negative in animals. 20 A) heat produced B) heat produced plus heat gained minus heat lost C) heat produced minus heat transferred D) heat transferred minus heat produced 21 A) The difference in metabolic rate of a human and a horse is about equal to that of a shrew and a mouse. B) Metabolic rate is based upon exhaled carbon dioxide and inhaled oxygen. C) The metabolic rate of an elephant is far greater than that of a mouse. D) The difference in metabolic rate between a human and an elephant is far less than between a mouse and a shrew.
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