Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Question
Chapter 44.4, Problem 2R
Summary Introduction
To review:
The flow of information in a knee-jerk reflex circuit with the help of a diagram.
Introduction:
In a situation where conscious processing of information is not required, a reflex reaction takes place. The reflex reaction is unconscious and involuntary. For example, immediate removal of hand when placed accidentally on fire. To perform the normal movement of legs, the knee-jerk response is required. In this response, the muscles act in opposite manner, i.e., while one pair of muscle is relaxed (the extensor muscle), the other one is in the contracted state (the flexor muscle).
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Describe the components of the knee-jerk reflex?
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Chapter 44 Solutions
Life: The Science of Biology
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Similar questions
- Draw a well labelled diagram of reflex arc?arrow_forwarda) Describe the processes involved in the knee-jerk reflex and explainwhy it is called a ‘monosynaptic’ reflex.b) While crawling across the floor a child accidentally places her righthand onto a piece of broken glass. How will the flexor muscles of herleft arm respond? What happens to the rest of her body?arrow_forwardIn the knee-jerk reflex, the afferent neurons Select one: a. innervate leg flexor muscles b. are sensory neurons c. innervate leg flexor and extensor muscles d. innervate leg extensor muscles e. are cranial nervesarrow_forward
- What is the sensory receptor in the knee-jerk reflex?arrow_forwardCheck this reflex by gently dorsiflexing a classmate’s foot then using a reflex hammer to strike the Achilles tendon. What was the result? Do you normally get the observed reaction when the gastrocnemius muscle is contracted?arrow_forwardWhich of the following describes a stretch reflex?A. The receptor detects that a muscle is stretched, and sends a signal to contract it reflexively.B. The receptor detects that a muscle is contracted, and sends a signal to stretch it reflexively.arrow_forward
- When you lift a heavy box, your muscles need to generate a stronger than average contraction. What will happen to the timing and frequency of nerve stimulation of your muscles, and why?arrow_forwardExplain why α‒γ coactivation is important for quality control of voluntary motions.arrow_forwardWhat is the approximate amplitude in mV of the twitch in recording B? Be careful and note the position of the baseline! In which recording, A or B, is the amplitude of the muscle twitch measured correctly? In which recording, A,B, or C, is the time between the second two twitches measured correctly?arrow_forward
- Describe the functions of gamma motor neurons and explain why they are stimulated at the same time as alpha motor neurons during voluntary muscle contractions.arrow_forwardCompare and contrast the neural paths for a somatic reflex versus a visceral reflex. (answer max 10sentences)arrow_forwardMuscle twitching can be explained by the_________ action of synapse. A. Cell signalling B. Temporal Summation C. Spatial Summation D. All for nothing responsearrow_forward
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