ANAT.+PHYSIO.1-LAB.MAN. >CUSTOM<
20th Edition
ISBN: 9781264303106
Author: VanPutte
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 12, Problem 8RAC
Summary Introduction
Introduction:
The automatic response to a stimulus is referred to as a reflex. The types of reflexes are autonomic reflexes and somatic reflexes. Autonomic reflexes maintain constant blood pressure and blood carbon dioxide levels.
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The crossed extensor reflex that takes place when a person steps on a tack
involves the participation of both lower extremities. If you accidently step on a
sharp tack with your right foot, which one of the following actions will take place
so that you can safely pull your injured foot away from the painful stimulus?
O the flexors of the right knee will be inbibited
O the extensors of the right knee will be stimulated
O the extensors of the left knee will be stimulated
O the flexors of the left knee will be stimulated
An individual suffers a disease that destroys all the muscle spindles in his
quadriceps muscle. What will happen when this individual undergoes a patella
tendon reflex test?
O his knee jerk response will be highly exaggerated
O his knee jerk response will be weak
O his knee jerk response will be absent
O his knee jerk response will vary with body posture
Describe the sequence of events that occurs from the time the patellar tendon is stretched to the time the leg is extended
Chapter 12 Solutions
ANAT.+PHYSIO.1-LAB.MAN. >CUSTOM<
Ch. 12.1 - Prob. 1AYPCh. 12.1 - Name the meninges surrounding the spinal cord....Ch. 12.1 - What is the thecal sac? What two structures hold...Ch. 12.1 - Describe the arrangement of gray arid white matter...Ch. 12.1 - Where are the cell bodies of somatic motor and...Ch. 12.1 - What kinds of neurons are in the dorsal roots, in...Ch. 12.2 - Prob. 7AYPCh. 12.2 - Describe the operation of a gamma motor neuron.Ch. 12.2 - Prob. 9AYPCh. 12.2 - Prob. 10AYP
Ch. 12.2 - Prob. 11AYPCh. 12.3 - Prob. 12AYPCh. 12.3 - What is a dermatome? Why are dermatomes clinically...Ch. 12.3 - Prob. 14AYPCh. 12.3 - Describe the distribution of the ventral rami of...Ch. 12.3 - Prob. 16AYPCh. 12.3 - Prob. 17AYPCh. 12.3 - Prob. 18AYPCh. 12.3 - Name the five major nerves that emerge from the...Ch. 12.3 - Name the four major nerves that arise from the...Ch. 12.3 - Prob. 21AYPCh. 12.3 - Describe the structures innervated by the...Ch. 12.3 - Prob. 23AYPCh. 12 - Prob. 1RACCh. 12 - The structure that anchors the inferior end of the...Ch. 12 - Prob. 3RACCh. 12 - Given these components of a reflex arc: (1)...Ch. 12 - Prob. 5RACCh. 12 - Several of the events that occur between the time...Ch. 12 - Prob. 7RACCh. 12 - Prob. 8RACCh. 12 - Damage to the dorsal ramus of a spinal nerve...Ch. 12 - Prob. 10RACCh. 12 - A dermatome Is the area of skin supplied by a pair...Ch. 12 - Prob. 12RACCh. 12 - The skin on the posterior surface of the hand is...Ch. 12 - The scatic nerve is actually two nerves combined...Ch. 12 - Prob. 15RACCh. 12 - Describe how stimulation of a neuron that has its...Ch. 12 - Prob. 2CTCh. 12 - Prob. 3CTCh. 12 - Prob. 4CTCh. 12 - Prob. 5CTCh. 12 - Prob. 6CTCh. 12 - Prob. 7CT
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- Why is an interneuron needed to provide reciprocal inhibition of the flexor muscle when an extensor muscle is activated?arrow_forwardA tap on the patellar tendon at the knee joint is used to test the knee-jerk reflex. All of the followings are correct, except ---------------------. The reflex starts with the 1a sensory neurons of the muscle spindle There is an excitatory stimulus to the motor pool of the extensor muscle There is a stimulation of the excitatory interneuron of the flexor muscle Excitation of the extensor muscle fibers causes the knee extension Muscle contraction depends on coordination between motor pools of antagonistic musclesarrow_forwardIn flexor withdrawal reflexes contraction of flexor muscles is associated with reciprocal inhibition of :-a- synergistic flexor musclesb- contralateral extensor musclesc- ipsilateral extensor musclesd- both ‘a’ and ‘b’ are correctarrow_forward
- When a skeletal muscle is stimulated to contract, the force generated by the muscle can damage the tendon connected to the muscle. The sensory receptors in the tendons that are able to inhibit the muscle from generating excessive force are the: O gamma efferents O Golgi tendon organs O musele spindles O proprioceptorsarrow_forwardIf the number of active cross bridges in skeletal muscle begins to decline although the rate of stimulus delivery remains constant, which of the following is likely occurring? Fatigue O Complete fused tetanus O Unfused tetanus Treppearrow_forwardStretch of an innervated muscle evokes :-a- contraction of its spindlesb- contraction of its extrafusal fibersc- contraction of antagonistic musclesd- relaxation of synergistic musclesarrow_forward
- What are the five reflex arc components for the Achilles Tendon Reflex? Receptor, the type of the receptor, the location The sensory neuron The control center The motor neuron The effectorarrow_forwardDo you think the patellar reflex would be inhibited or enhanced by actively contracting the quadriceps muscle group? With an understanding of how muscle spindle fibers work, explain how active contraction of a muscle might affect the myotactic reflex. [hint: try to elicit a knee jerk reflex when someone is doing a leg lift]arrow_forwardWhat are the five reflex arc components for the Biceps Tendon Reflex? Receptor, the type of the receptor, the location The sensory neuron The control center The motor neuron The effectorarrow_forward
- Exaggeration of tendon jerks could result from any of the following conditions, except :-a- lesions of supraspinal facilitatory centersb- lesions of supraspinal inhibitory centersc- increased γ-motor neuron discharged- anxietyarrow_forwardIf you step on a sharp object with your right foot O your right leg extensor muscle will contract O your left leg extensor muscle will relax O your right leg flexor muscle will be inhibited O your left leg flexor muscle will receive inhibitory inputsarrow_forwardThe disease poliomyelitis (po′le-o-mi′˘e-li′tis) destroys motor neurons, causingloss of muscle function and even flaccid paralysis. Some patients recoverbecause axon branches form from the remaining motor neurons. Thesebranches innervate the paralyzed muscle fibers to produce motor unitswith many more muscle fibers than usual. How does this reinnervation ofmuscle fibers affect the degree of muscle control in a person who hasrecovered from poliomyelitis?arrow_forward
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