What are the stretch reflexes?
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.
What are the steps in a stretch reflex?
Terms in this set (5)
- Muscle Spindle Detects Stretch.
- Muscle stretch stimulates sensory nerve signals to travel to the CNS q.
- Sensory Neuron synapses on motor neurons.
- Motor neurons transmit nerve signals to extrafusal muscle fibers, resulting in contraction of the muscles (in response to being stretched)
How do you assess stretch reflexes?
Knee Jerk and Other Muscle Jerks Can Be Used to Assess Sensitivity of Stretch Reflexes. Clinically, a method used to determine the sensitivity of the stretch reflexes is to elicit the knee jerk and other muscle jerks.
Which reflexes are stretch reflexes?
The stretch reflex is also referred to as the deep tendon reflex or myotatic reflex. It is a simple pre-programmed response by the human body in response to the muscle being passively stretched e.g. by a tendon hammer, or a sudden change in the ground surface.
What are the two types of stretches?
There are two main types of stretches: static stretches and dynamic stretches.
What is the 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 happens in a stretch reflex quizlet?
What are the 3 phases of the stretch shortening cycle?
This pre-stretch, or ‘countermovement’ action is known as the stretch-shortening cycle (SSC) and is comprised of three phases (eccentric, amortization, and concentric) (Figure 1) (3).
Why is stretch reflex important?
The stretch reflex is very important in posture. It helps maintain proper posturing because a slight lean to either side causes a stretch in the spinal, hip and leg muscles to the other side, which is quickly countered by the stretch reflex. This is a constant process of adjusting and maintaining.
What does DTR 2 4 mean?
0 = no response; always abnormal. 1+ = a slight but definitely present response; may or may not be normal. 2+ = a brisk response; normal. 3+ = a very brisk response; may or may not be normal. 4+ = a tap elicits a repeating reflex (clonus); always abnormal.
What is the function of a stretch reflex quizlet?
What are the 3 types of stretch?
The different types of stretching are: ballistic stretching. dynamic stretching. active stretching.
What are the 4 types of stretches?
4 Different Stretches for Different Situations
- Active Stretching. Active stretching involves holding a pose to utilize a targeted muscle group.
- Passive Stretching. This type of stretching is best for balance enhancement and flexibility.
- Dynamic Stretching.
- PNF Stretching.
What is stretch reflex and what is your body trying to do for you?
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.
What does a stretch do?
Stretching can boost your flexibility and range of motion. It can also improve your circulation, and reduce pain, stress, and tension in your muscles. Stretching can be especially beneficial after sleeping, exercising, or sitting in the same position for several hours.
How does the stretch-shortening cycle affect the human body?
The stretch-shortening cycle (SSC) refers to the ‘pre-stretch’ or ‘countermovement’ action that is commonly observed during typical human movements such as jumping. This pre-stretch allows the athlete to produce more force and move quicker.
What does concentric and eccentric mean?
In a concentric contraction, the muscle tension rises to meet the resistance then remains stable as the muscle shortens. During eccentric contraction, the muscle lengthens as the resistance becomes greater than the force the muscle is producing.
What happens during stretching?
When a muscle is stretched, some of its fibers lengthen, but other fibers may remain at rest. The current length of the entire muscle depends upon the number of stretched fibers (similar to the way that the total strength of a contracting muscle depends on the number of recruited fibers contracting).
What are the 5 deep tendon 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.