What is a tonic stretch reflex?
The involuntary mechanism leading to changes in muscle activation and force with its slow stretch is called the tonic stretch reflex, and the dependence of active muscle force on muscle length is called the tonic stretch reflex characteristic.
What is the phasic stretch reflex quizlet?
What is the phasic stretch reflex? reflex contraction of muscle due to the response of muscle spindles to an increase in muscle tension.
What are examples of stretch reflex?
Another example of the stretch reflex is the knee-jerk test performed by physicians. When the patellar tendon is tapped with a small hammer, or other device, it causes a slight stretch in the tendon, and consequently the quadriceps muscles.
What is the difference between tonic and phasic contraction?
Phasic muscles are action muscles and use force when needed. Tonic muscles are slow twitch, meaning they can stay “on” for long periods of time. Tonic muscles are closer to the joints, they have great endurance, are oxygen fed, and are well integrated with the brain and vestibular system.
What is dynamic stretch reflex?
The static component of the stretch reflex is in place as long as the muscle is stretched. The dynamic phase occurs only when the muscle is stretched e.g. when the tendon is struck with a tendon hammer. When the muscle is stretched, they send an impulse via the sensory neurons to the relevant spinal cord segment.
What is the function of 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.
What type of reflex is a stretch reflex?
The stretch reflex can be a monosynaptic reflex which provides automatic regulation of skeletal muscle length, whereby the signal entering the spinal cord arises from a change in muscle length or velocity. It can also include a polysynaptic component, as in the tonic stretch reflex.
What are the three types of reflexes?
There are three common somatic reflexes discussed in most anatomy and physiology courses.
- Stretch (knee-jerk, patellar) reflex.
- Withdrawal (flexor) reflex.
- Crossed-extensor reflex.
Why are stretch reflexes clinically important?
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.
…
Clinical significance.
| Grade | Response | Significance |
|---|---|---|
| 4+ | clonus | always abnormal |
What is a phasic response?
Phasic receptors are rapidly adapting receptors. They will respond quickly to stimuli but stop responding upon continuous stimulation. Therefore, action potential frequency decreases during prolonged stimulation. This class of receptor conveys information about the changes to the stimulus such as intensity.
What is meant by phasic contraction?
Definition: A process in which force is generated within phasic smooth muscle tissue, resulting in a change in muscle geometry.
What is the 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.
What is the difference between static and passive stretching?
Alter, Static stretching consists of stretching a muscle (or group of muscles) to its farthest point and then maintaining or holding that position, whereas Passive stretching consists of a relaxed person who is relaxed (passive) while some external force (either a person or an apparatus) brings the joint through its …
Why are stretch reflexes important?
Functions. The first major function of the stretch reflex is muscle protection. When a muscle length increases, the muscle spindle within that muscle stretches, and its nerve activity will increase. Resulting from this is increased alpha motor neuron activity.
Is knee-jerk reflex a stretch reflex?
The patellar reflex, also called the knee reflex or knee-jerk, is a stretch reflex which tests the L2, L3, and L4 segments of the spinal cord.
What are the 4 types of reflexes?
In our discussion we will examine four major reflexes that are integrated within the spinal cord: the stretch reflex, the Golgi tendon reflex, the withdrawal reflex and the crossed extensor reflex.
What are 4 common reflexes?
We have different types of reflexes in the body. Four key examples are the stretch reflex, the flexor reflex, the crossed-extensor reflex, and the Golgi tendon reflex.
What causes the stretch reflex?
The stretch reflex can be activated by external forces such as a load placed on the muscle or internal forces i.e. the motor neurons being stimulated from within. An example of the former is someone holding a plate, and someone serving them some food.
What does tonic and phasic mean?
What is an example of a phasic receptor?
An example of a phasic receptor is the Pacinian corpuscle.
What is phasic and tonic contraction?
Discussion. Smooth muscle tissues are routinely characterized as being either “tonic” (generating a slow maintained isometric contraction) or “phasic” (generating a fast transient isometric contraction).
What is the difference between phasic and tonic contraction?
While phasic muscles activate when we insist that they do, tonic muscles can be thought of as “background” muscles. They act with little or no stimulus and, given that these muscles are responsible for holding you upright, it’s a darn good thing that they do.
What is the difference between autogenic and reciprocal inhibition?
The key difference between autogenic and reciprocal inhibition is that autogenic inhibition is the ability of a muscle to relax when it experiences a stretch or increased tension while reciprocal inhibition is the relaxation of muscles on one side of a joint to accommodate contraction on the other side of that joint.
What are the 5 deep tendon reflexes?
They are sometimes referred to as muscle stretch reflexes. There are five primary deep tendon reflexes: bicep, brachioradialis, triceps, patellar, and ankle. Each reflex corresponds to a particular root and muscle and will evaluate the integrity of the root and associated nerve.
What are the 3 types of stretch?
When it comes to stretching, there are three main techniques: static, dynamic, and ballistic stretching.