The reflex that prevents excessive tension in a muscle is the
A. stretch reflex.
B. withdrawal reflex.
C. Golgi tendon reflex.
D. reciprocal reflex.
E. crossed extensor reflex.
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Question 2) The knee-jerk reflex involves which of the following?
A. sensory and motor neurons
B. sensory, association and motor neurons
C. sensory, motor and inhibitory interneurons
D. sensory and association neurons
E. the brain
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Question 3) Muscles and glands that are capable of producing a response when stimulated by motor neurons are called
A. aponeuroses.
B. effectors.
C. neuromodulators.
D. receptors.
E. sensory organs.
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Question 4) Muscle spindles
A. are innervated by gamma motor neurons.
B. originate in the spinal cord.
C. are specialized nerve cells.
D. are found encapsulated in nerve endings.
E. are innervated by alpha motor neurons.
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Question 5) Which of the following events in a stretch reflex occurs last?
A. alpha motor neurons transmit action potentials to muscle causing contraction
B. muscle spindle detects stretch of muscle
C. afferent neurons conduct action potentials to the spinal cord
D. afferent neurons synapse with alpha motor neurons
E. muscle is stretched
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Question 6) Gamma motor neurons
A. are located in tendons.
B. transmit action potentials to skeletal muscle.
C. regulate the sensitivity of the muscle spindle.
D. enable the brain to perceive that a muscle has been stretched.
E. innervate the whole muscle.
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Question 7) Reflexes
A. are homeostatic.
B. are not homeostatic.
C. are voluntary conscious responses to a stimulus.
D. are integrated in the spinal cord, but not the brain.
E. are integrated in the brain, but not the spinal cord.
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Question 8) Stretch reflexes
A. are learned voluntary responses.
B. aid in maintaining proper posture.
C. prevent muscles from being damaged by excessive tension.
D. cause the removal of limbs from painful stimuli.
E. prevent falling.
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Question 9) Which portion of a reflex arc is most likely to be located entirely within the central nervous system?
A. sensory neuron
B. motor neuron
C. effector cell
D. interneuron
E. receptor cell
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Question 10) Place the following parts of a reflex arc in the correct order beginning with the sensory receptor. (1) motor neuron (2) interneuron (3) effector (4) sensory neuron (5) sensory receptor
A. 5, 1, 2, 3, 4
B. 5, 3, 2, 4, 1
C. 5, 4, 3, 2, 1
D. 5, 2, 3, 4, 1
E. 5, 4, 2, 1, 3
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