ch12 - Chapter 12 Human Physiology: How Does the Human Body...

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Chapter 12 Human Physiology: How Does the Human Body Work? 1. What will happen if the internal environment surrounding cells in an organism varies too much from the normal conditions those cells usually experience? a. The cells move. b. The cells die. c. The cells expand. d. The cells shrink. e. The cells divide. Ans: b 2. Human physiology is the study of how the body as a whole copes with ______. a. change b. time c. language d. constancy e. insanity Ans: a 3. All of the following structures can affect the speed at which nerve impulses are conducted EXCEPT: a. myelin sheath b. nodes c. polarity d. axon diameter e. synapse Ans: c 4. The central nervous system includes which of the following structures? I. brain II. sensory neurons III. spinal cord IV. motor neurons a. I and II 190
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Chapter 12 b. I and III c. I and IV d. II and IV e. III and IV Ans: b 5. Select the INCORRECT statement about motor neurons. a. Motor neurons carry information to voluntary muscles such as the bicep b. Motor neurons carry information to involuntary effectors such as the heart c. Motor neurons are a part of the peripheral nervous system d. Motor neurons are a part of the central nervous system e. Motor neurons are characterized as somatic and automatic Ans: d 6. Which of these is mis-matched? a. axon: a singe, large extension leaving the cell body b. dendrite: many long, thin extensions of cell body sending outgoing signals c. cell body: contains nucleus and other organelles d. neuron: excitable cell e. myelin sheath: cellular substance formed by Schwann cells Ans: b 7. Which systems are most directly responsible for regulating and maintaining homeostasis? a. nervous and endocrine b. digestive and excretory c. circulatory and respiratory d. visual and auditory e. reproductive and olfactory Ans: a 8. What is the name of the part of the nervous system that includes all of the nerves, each of which is composed of bundles of neurons carrying messages toward and away from the brain and spinal cord? a. peripheral nervous system b. central nervous system 191
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Chapter 12 c. autonomic nervous system d. sympathetic nervous system e. sensory nervous system Ans: a 9. What is the basic functional unit of the nervous system? a. a neuron b. the brain c. the spinal cord d. a nerve e. neurotransmitters Ans: a 10. What is the sequence of the unidirectional flow of information through a single neuron to the next cell in line? a. dendrites —> cell body —> axon —> adjacent neurons or effector cells b. axon —> cell body —> dendrites —> adjacent neurons or effector cells c. adjacent neurons or effector cells —> axon —> cell body —> dendrites d. dendrites —> axon —> cell body —> adjacent neurons or effector cells e. adjacent neurons or effector cells —> cell body —> axon —> dendrites Ans: a 11. What causes a delay in another action potential from a neuron that has just fired an action potential? a. depolarization
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ch12 - Chapter 12 Human Physiology: How Does the Human Body...

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