When A Stimulus Results In The Stretching Of A Muscle That Muscle Reflexively? (Solution)

One of the simplest reflexes is a stretch reflex. In this reflex, when a skeletal muscle is stretched, a muscle spindle in the belly of the muscle is activated. The axon from this receptor travels to the spinal cord where it synapses with the motor neuron controlling the muscle, stimulating it to contract.

  • The stimulation of a reflexive muscle contraction is known as the stretch or myotatic reflex. It can inhibit the opposing muscle, ie the antagonist to the muscle being stretched, to prevent it from contracting so that it can’t contribute to any further stretching (ie reciprocal inhibition).

What is the stretch reflex reaction?

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. When a muscle lengthens, the muscle spindle is stretched and its nerve activity increases.

What response does the stretch reflex initiate in a muscle?

The stretch reflex or myotatic reflex refers to the contraction of a muscle in response to its passive stretching by increasing its contractility as long as the stretch is within physiological limits.

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Is the stretch reflex excitatory or inhibitory?

The Ia afferent directly causes excitation of the stretched muscle, and the inhibitory Ia interneuron mediates inhibition of the antagonist muscle. This impulse is also modulated by descending motor tracts, including the corticospinal tracts.

What causes the stretch reflex?

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).

What happens when a muscle stretches?

When you stretch a muscle, your body responds by increasing blood flow to that area. The blood vessels around the targeted muscle widen to allow more blood to flow through, and your heart starts pumping more blood.

What happens in a stretch reflex quizlet?

The stretch reflex (myotatic reflex) is a muscle contraction in response to stretching within the muscle. It is a monosynaptic reflex which provides automatic regulation of skeletal muscle length. When a muscle lengthens, the muscle spindle is stretched and its nerve activity increases.

Is stretching voluntary or involuntary?

This information is used to control both voluntary and involuntary movements. A sudden muscle stretch sends a barrage of impulses into the spinal cord along the muscle spindle sensory fibers. In turn, these fibers activate motor neurons in the stretched muscle, causing a contraction called the stretch reflex.

What receptors initiate the inverse stretch reflex?

The Inverse Myotatic Reflex Involves Sensors of Muscle Force in the Tendon. Stretch receptors called Golgi tendon organs are found within the collagen fibers of tendons and within joint capsules.

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What happens when a muscle spindle is stretched?

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.

Is stretch reflex excitatory?

Basic circuitry underlying the knee-jerk stretch reflex. Ia spindle afferents from the quadriceps muscle make monosynaptic, excitatory connections on α-motor neurons that innervate the quadriceps.

Which stimulus causes a muscle to reflexively contract?

Muscles contain receptors called muscle spindles. (See Figure 13.13) These receptors respond to the muscles’s stretch. They send stimuli back to the spinal cord through a sensory neuron which connects directly to a motor neuron serving the same muscle. This causes the muscle to contract, reversing the stretch.

What causes reciprocal inhibition?

The theory of reciprocal inhibition states that “When the central nervous system sends a message to the agonist (muscle causing movement) to contract, the tension in the antagonist (muscle opposing movement) is inhibited by impulses from motor neurons, and thus must simultaneously relax”, taken from Massage Therapy

What do stretch receptors do?

muscle systems …has important sensory structures called stretch receptors, which monitor the state of the muscle and return the information to the central nervous system. Stretch receptors are sensitive to the velocity of the movement of the muscle and the change in length of the muscle.

What is a stretch reflex example?

For example, this reflex occurs is when a person is standing in an upright position then begins to lean on one side. Some of the stretch reflexes are jaw jerk reflex, biceps reflex, brachioradialis reflex, triceps reflex, patellar reflex, and ankle jerk reflex. Synonyms: myotatic reflex.

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What is inverse stretch reflex?

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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