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Anatomy and Physiology 1 Chapter 13

front 1 What reaction would occur if the muscle labeled E were suddenly pulled longer? the relaxation of muscle E the relaxation of the both muscles E and G the contraction of muscle E the contraction of the both muscles E and G	back 1 the contraction of muscle E A sudden stretch in a muscle leads to the contraction of the stretched muscle (E) and the relaxation of the antagonistic muscle (G).
front 2 Which cranial nerve transmits information about audition? optic abducens vestibulocochlear vagus	back 2 vestibulocochlear The vestibular branch of the vestibulocochlear nerve transmits afferent impulses for the sense of equilibrium. The cochlear branch transmits afferent impulses for the sense of hearing.
front 3 Which cranial nerve innervates most of the visceral organs? accessory hypoglossal vagus abducens	back 3 vagus The vagus nerve has many targets in the thoracic and abdominal cavities and innervates many of the visceral organs.
front 4 Which of the following carries no sensory information? trigeminal nerve vestibulocochlear nerve hypoglossal nerve optic nerve	back 4 hypoglossal nerve The hypoglossal nerve carries motor commands to the tongue.

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front 6 The knee-jerk reflex is an example of a __________. tendon reflex flexor reflex stretch reflex superficial reflex	back 6 stretch reflex The most familiar clinical example of a stretch reflex is the knee-jerk reflex. The overall goal of a stretch reflex is to maintain a muscle's length and in turn maintain body position. For example, the knee-jerk reflex, during which the knee extensors contract in response to being stretched, helps keep your knees from buckling when you are standing upright.
front 7 Which pair below is incorrect? cranial nerve VI: eye movement cranial nerve III: oculomotor nerve cranial nerve III: pupillary constriction optic nerve: sensory cranial Nerve IV: sensory	back 7 cranial Nerve IV: sensory The trochlear nerve is a motor nerve that innervates the superior oblique of the eye.
front 8 Which reflex has a contralateral component? stretch crossed-extensor tendon flexor	back 8 crossed-extensor The crossed-extensor reflex activates opposing actions in the opposite limb.

front 9 The phrenic nerve is a branch from the __________. brachial plexus thoracic spinal cord vagus nerve cervical plexus	back 9 cervical plexus The phrenic nerve, which arises from the cervical plexus, supplies both motor and sensory fibers to the diaphragm, the main breathing muscle.
front 10 What is the type of reflex represented by the pathway that includes A, D, and C? reciprocal inhibition stretch reflex cross-extension reflex flexor reflex	back 10 reciprocal inhibition When a muscle is contracted, its antagonist (“reciprocal”) is reflexively relaxed.
front 11 The sensory division of the PNS is also known as the efferent division. True False	back 11 False All of the sensory information is considered afferent, or flowing toward the CNS. Efferent means "from the CNS."
front 12 __________ are receptors that can respond to painful stimuli. Photoreceptors Nociceptors Mechanoreceptors Chemoreceptors	back 12 Nociceptors Nociceptors respond to potentially damaging stimuli that result in pain.

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front 15 What is the specific function of the structure labeled F? increasing tension of the surrounding muscle increasing tension of the antagonistic muscle determination of muscle tension determination of muscle length	back 15 increasing tension of the antagonistic muscle
front 16 In carpal tunnel syndrome, the __________ is compressed. axillary nerve median nerve musculocutaneous nerve radial nerve	back 16 median nerve The median nerve descends through the arm and forearm before passing through the wrist. Compression of this nerve in the anterior wrist causes carpal tunnel syndrome.

front 17 The synapse between which of the following two neurons is a part of a monosynaptic reflex arc? A and D A and B B and C A and C	back 17 A and B A monosynaptic reflex arc includes a synapse between sensory and motor neurons without the involvement of an interneuron.
front 18 Which of the receptor types pictured functions exclusively as a proprioceptor? B C D All of the listed responses are correct.	back 18 B Proprioceptors are sensitive to stimuli associated with body movements. The muscle spindle shown in B is responsive to muscle stretch.
front 19 Which of the following is NOT correct concerning nerves? Nerves do not contain cell bodies. Nerves are analogous to tracts in the CNS. Nerves are covered by an outer sheath called the epineurium. Nerves are collection of axons of either sensory or motor neurons but not both.	back 19 Nerves are collection of axons of either sensory or motor neurons but not both. Nerves can be mixed collections of both sensory and motor axons.
front 20 Which of the following cranial nerves carries only motor information? optic trigeminal olfactory abducens	back 20 abducens The abducens carries efferent (motor) signals to the extrinsic eye muscle that abducts the eye (turns it laterally).