What Occurs When A Muscle Spindle Is Activated Due To A Quick Stretching Of A Muscle? (Best solution)

When muscles lengthen, the spindles are stretched. This stretch activates the muscle spindle which in turn sends an impulse to the spinal cord. This impulse results in the activation of more motor neurons at spinal level that send an impulse back to the muscle.

How does the muscle spindle work when stretching?

  • Stretching muscles to generate force. Loading the muscle spindle: When activated the muscle spindle causes the muscle being stretched to generate tension to resist the stretch, so by stretching a muscle immediately prior to a contraction you effectively prime the muscle to create more force for that contraction.

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What occurs when a muscle spindle is activated due to a quick stretching of a muscle group of answer choices?

This process is called the stretch reflex. When a muscle spindle’s associated muscle is rapidly stretched, the spindle can cause two things to happen: Functionally, muscle spindles are stretch detectors, and sense how much and how fast a muscle is lengthened or shortened.

What happens to the muscle when a muscle spindle is stimulated?

Stimulation of muscle spindles elicits a contraction in the stretched muscle (myotatic reflex, i.e. stretch reflex) and at the same time inhibits action potentials to antagonistic muscles. The muscle spindles also participate in regulating the muscle tone.

When a muscle spindle is activated What does it tends to?

When a muscle spindle’s associated muscle is rapidly stretched, the spindle can cause two things to happen: (1) it may signal its muscle to contract to prevent it from going too far, too quickly in the stretch; and (2) it can inhibit the opposing muscle (the antagonist to the muscle being stretched) to prevent it from

What is the response when a muscle is stretched?

The stretch reflex (myotatic reflex), or more accurately “muscle stretch reflex”, is a muscle contraction in response to stretching within the muscle. The reflex functions to maintain the muscle at a constant length.

Which of the following is activated when muscles are stretched rapidly and responds by contracting the muscle reflexively?

The stretch reflex is activated (or caused) by a stretch in the muscle spindle. When the stretch impulse is received a rapid sequence of events follows. The motor neuron is activated and the stretched muscles, and its supporting muscles, are contracted while its antagonist muscles are inhibited (relaxed).

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What is a muscle spindle quizlet?

Describe the muscle spindle. – a peripheral receptor. – located in the muscle belly of skeletal muscles. – each spindle consists of intrafusal fibbers, sensory nerve endings, and gamma motor neurone endings. – responsible for conveying info to the CNS about absolute muscle length and changes in muscle length.

What action will the Golgi tendon organ make when activated?

A reflex action mediated by the Golgi tendon organs that is called the inverse stretch reflex. When the organs are stimulated by a prolonged stretch they cause the stretched muscle to relax.

What are the two primary actions of the muscle spindle?

The muscle spindle signals muscle length and velocity to the CNS through two types of specialized sensory fibers that innervate the intrafusal fibers. These sensory fibers have stretch receptors that open and close as a function of the length of the intrafusal fiber.

What action will the Golgi tendon organ make when activated to prevent the muscle from being placed under excessive stress and being injured?

When you lift weights, the golgi tendon organ is the sense organ that tells you how much tension the muscle is exerting. If there is too much muscle tension the golgi tendon organ will inhibit the muscle from creating more force ( via a reflex arc ), thus protecting you from injuring itself.

What does a muscle spindle do?

Functionally, muscle spindles are stretch detectors, i.e. they sense how much and how fast a muscle is lengthened or shortened [19]. Accordingly, when a muscle is stretched, this change in length is transmitted to the spindles and their intrafusal fibers which are subsequently similarly stretched.

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Which structures regulate the sensitivity of the muscle spindle?

Efferent nerve fibers of gamma motor neurons also terminate in muscle spindles; they make synapses at either or both of the ends of the intrafusal muscle fibers and regulate the sensitivity of the sensory afferents, which are located in the non-contractile central (equatorial) region.

Which role do γ motor neurons play in the function of a muscle spindle?

The gamma motor neurons innervate the muscle spindle at each end. They allow contraction of the intrafusal fibers and increase their sensitivity to stretch. In this way the gamma motor neurons form an important muscle stretch reflex mechanism that acts in conjunction with the alpha motor neurons.

What is rapid stretching?

This intense stretching method uses bouncing movements to push your body beyond its normal range of motion. Whereas static stretches are performed slowly and gradually, the ballistic method stretches muscles much farther and faster.

What happens in a stretch reflex quizlet?

The stretch reflex (myotatic reflex) is a muscle contraction in response to stretching within the muscle. When a muscle lengthens, the muscle spindle is stretched and its nerve activity increases. This increases AMN activity, causing the muscle fibers to contract and thus resist the stretching.

What response does the inverse stretch reflex initiate in a muscle?

The Golgi tendon reflex (also called inverse stretch reflex, autogenic inhibition, tendon reflex) is an inhibitory effect on the muscle resulting from the muscle tension stimulating Golgi tendon organs (GTO) of the muscle, and hence it is self-induced.

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