The flexion-crossed extension reflex would occur in response to which activity?Group of answer choicesHolding a box steady as more items are added to itCoordinating your legs to squatA knee tap with a reflex hammerSquinting when you move from a dark room to bright sunlightStepping on a sharp object
Question
The flexion-crossed extension reflex would occur in response to which activity?Group of answer choicesHolding a box steady as more items are added to itCoordinating your legs to squatA knee tap with a reflex hammerSquinting when you move from a dark room to bright sunlightStepping on a sharp object
Solution
The flexion-crossed extension reflex would occur in response to stepping on a sharp object.
Here's the step-by-step explanation:
-
The flexion-crossed extension reflex, also known as the step reflex, is a protective withdrawal reflex.
-
When you step on a sharp object, pain receptors (nociceptors) in your foot are stimulated.
-
These receptors send signals via sensory neurons to your spinal cord.
-
In the spinal cord, these sensory neurons synapse with interneurons.
-
Some of these interneurons synapse with motor neurons leading back to the muscles in the same foot, causing it to flex and withdraw from the painful stimulus (this is the flexion part of the reflex).
-
Other interneurons cross to the other side of the spinal cord and synapse with motor neurons leading to the muscles in the other leg. These muscles extend to support the body's weight as the injured foot is lifted (this is the crossed extension part of the reflex).
-
So, the overall effect of the flexion-crossed extension reflex is to withdraw the injured foot from the painful stimulus and maintain balance by extending the other leg.
Similar Questions
In the context of ballistic stretching, the use of a fast, forceful, bobbing type of stretching induces the stretch reflex. The purpose of this reflex action is _____.Multiple choice question.to help a person stay balancedto prevent injury caused by overstretchingto improve a person's core fitnessto prevent the loss of flexibility in early adolescence
In a withdrawal reflex, flexor muscles on the affected side of the body contract. Simultaneously, a ______ reflex is initiated which causes the contralateral extensor muscles to contract in order to help maintain balance.Multiple choice question.stretchjerkcrossed extensorreciprocal
A ______ reflex is protective in that it causes the body part to be pulled away from a painful stimulus.Multiple choice question.stretchwithdrawalcontralateral
The adaptive significance of the crossed extensor reflex when a person steps on a tack is toMultiple Choiceremove the foot from the tack.increase the rate at which withdrawal of the limb occurs.slow the rate of removal of the foot from the tack.reduce the pain sensations.prevent the person from falling down.
A movement that increases the angle between bones at a joint, moving them farther apart, is called ______ of the joint.Multiple choice question.abductionflexioninversionextension
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.