1) ALL of the following are TRUE for the stretch reflex arc EXCEPT: a) it is a c

Question

1) ALL of the following are TRUE for the stretch reflex arc EXCEPT:

a) it is a contralateral reflex arc

b) the receptors in the arc are called muscle spindles

c) it is a monosynaptic reflex arc

d) the sensory neuron synapses with a motor neuron in the anterior gray horn of the spinal cord

e) the effectors in the arc are skeletal muscles

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2) Clark has fallen off his horse, and landed on his head. He can now breathe only with the aid of a respirator. This is most likely because he has:

a) damanged the spinal cord about the level of C3

b) punctured his lungs via broken vertebrae and ribs

c) severed the intercostal nerves innervating the thoracic structures

d) crushed the centers in the brain that regulate breathing

e) ruptured the upper airpassages as his head compressed onto his neck

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3) A misplaced intramuscular injection has rendered a patient unable to abduct his arm. This patient most likely has damanged to the:

a) axillary nerve

b) median nerve

c) radial nerve

d) ulnar nerve

e) phrenic nerve

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4) Output from the basal ganglia comes mainly from the:

a) red nucleus

b) substantia nigra

c) caudate nucleus

d putamen

e) globus pallidus

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5) Cell bodies for second order sensory neurons conveying impulses for proprioception and most tactile sensations are located in the:

a) dorsal root ganglia

b) nucleus cuneatus and nucleus gracilis

c) medial lemniscus

d) posterior gray horn of the spinal cord

e) postcentral gyrus

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6) Axons of first order sensory neurons conveying impulses for proprioception and most tctile sensations from the:

a) anterior spinothalamic tract

b) fasciculus cuneatus and fasciculus gracilis

c) medial lemniscus

d) internal capsule

e) somatosensory area of the cerebral cortex

Explanation / Answer

1.Answer is A.

Stretch reflex arc is ipsilateral monosynaptic reflex arc.it aids in muscle contraction in response to stretching that occurs within the muscle.hence afferent is muscle spindle and efferent is skeletal muscle.

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