I use a reflex hammer to deliver a quick blow to your patellar tendon. Please detail the steps that are necessary for the proper function of the monosynaptic stretch reflex in this example (and by detail I want you to name each of the key components involved in the reflex and what is happening within each component).
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This stretch serves as the initial stimulus for the reflex. Show more…
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Which of the following statements about the knee-jerk reflex is true? True False It is a polysynaptic reflex. Muscle stretch receptors are activated by the hammer tap. The afferent (sensory) nerve travels from the receptor to the spinal cord. The leg extends in response to a hammer tap. The reflex involves only three neurons - a sensory neuron, an intermediate neuron, and a motor neuron. In a healthy adult, what happens when the sole of the foot is stroked? The big toe does not move. The big toe dorsiflexes (extends upwards). The big toe flexes (curls downwards).
Madhur L.
Using the list provided, complete the blanks in the following description of the stretch reflex associated with the knee. The patellar hammer is used to strike the patella of the quadriceps muscle group just below the knee. This results in a stretch of the muscle and the specialized receptor within the muscle called the muscle spindle. The resultant increase in length leads to an increased discharge of spindle afferents, particularly the Ia afferents. The discharge travels up the nerve to the spinal cord where the afferents make a monosynaptic excitatory contact onto alpha motoneurons from the same muscle group that the afferent information came from. The resultant excitation leads to action potentials being generated in the axon, which then travel down to the muscle and cause it to contract. This causes the lower limb to extend away from the body.
A doctor assesses Karomo somatic reflex by tapping his patellar tendon with a rubber hammer directly below the knee cap. Of the choices provided, what are the steps in the patellar stretch reflex arc? The effector responds. Sensory neurons synapse with interneurons. Action potentials propagate along afferent neurons. Stretch receptors in the muscle are stimulated. Sensory neurons synapse with motor neurons. Action potentials propagate along motor neurons. Interneurons synapse with motor neurons. 19. In this particular reflex arc (see above question), is there any neuron that is exclusively located in the central nervous system? No. Yes. 20. When the doctor triggers the patellar reflex, what is she assessing? The healthy functioning of the cerebellum. The health of the nervous tissue between the knee and spinal cord. The health of the nervous tissue between the knee and the cerebral cortex. The health of the nervous tissue between the knee and the foot. All of the above.
Adi S.
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