what is the biological purpose of a stretch reflex?
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- 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.
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Understanding the Stretch Reflex (or Myotatic 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.he stretch reflex can be activated by external forces (such as a load placed on the muscle) or internal forces (the motor neurons being stimulated from within.) An example of the former is a person holding an empty tray in their outstretched arm and then having a plate of food set on it.
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Stretch Reflex Clinical testing of reflexes. 1  Jaw jerk reflex (CN V- Mandibular division of the Trigeminal nerve): It is a stretch reflex used to test the cranial nerve V. The mandible is struck just below the lower lips while the mouth is slightly open. This causes the masseter muscle to contract, and the jaw to shut.
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The Physiology of Flexibility The first is the muscle spindles. Located within the muscle fibres they monitor changes in muscle length. The stretch reflex is the bodys involuntary response to an external stimulus that stretches the muscle (5) and causes a reflexive increase in muscular activity. It is the muscle spindles that activate this response. When stretching, it is best to avoid this activating the muscle spindles and the stretch-reflex response, as it will limit motion. Static stretching does not elicit the muscle spindles, allowing muscles to relax and achieve a greater stretch. The other important proprioceptors are the golgi tendon organs (GTO).
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reflex spinal reflex response of longitudinal muscles surrounding the spine to sudden and imposed stretch; unexpected flexion (forward) or extension (backward) movements induce reflex contraction of the opposing spinal muscle group, maintaining the erect posture
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- The muscle spindle is the major stretch receptor that monitors the length of the muscle, and just like cutaneous afferents, it has RA and SA components. From: The Nervous System (Second Edition), 2010
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Understanding the Stretch Reflex (or Myotatic Reflex) The stretch reflex is 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.nother 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.
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Stretch reflex Spinal reflexes include the stretch reflex, the Golgi tendon reflex, the crossed extensor reflex, and the withdrawal reflex. Stretch Reflex. The stretch reflex (myotatic reflex) is a muscle contraction in response to stretching within the muscle. This reflex has the shortest latency of all spinal reflexes.
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Stretch reflex 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.This increases alpha motor neuron activity, causing the muscle fibers to contract and thus resist the stretching. secondary set of neurons also causes the opposing muscle to relax. The reflex functions to maintain the muscle at a constant length. Gamma motoneurons regulate how sensitive the stretch reflex is by tightening or relaxing the fibers within the spindle.
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STRETCH REFLEX Also called stretch receptors. y. y The purpose of muscle spindles stretch reflex is to help maintain muscle tone and to protect your body from injury caused by overstretching.How the Message Travels From the Receptor to the Effector. Stretch Reflex. Response Reflexes STATIC RESPONSE-primary and secondary endings-slowly stretched DYNAMIC RESPONSE-primary endings-rapid change in spindle length.
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Sneeze Reflex, Process and Mechanism The other theory is that this stems from the medulla as a crossing over of impulses from neighboring centers into the sneezing center. Snatiation reflex, where stretching of the stomach causes sneezing, and sexual excitement or an orgasm triggers sneezing may be due to central causes.
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Stretching Muscles contain receptors called spindles and Golgi tendon organs that provide sensory information regarding changes in the length and tension of the muscle. The main function of the spindles is to respond to stretch in a muscle and, through reflex action, initiate a stronger contraction to reduce this stretch.uscles contain receptors called spindles and Golgi tendon organs that provide sensory information regarding changes in the length and tension of the muscle. The main function of the spindles is to respond to stretch in a muscle and, through reflex action, initiate a stronger contraction to reduce this stretch.
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- BIOL 347 General Physiology Lab Part 1: Grip Strength and Electromyogram (EMG) Activity Part 2: Stretch Receptors and Reflexes Objectives • To determine the relationship between the intensity of EMG activity and the force of a muscle contraction.
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- Ruffini corpuscles in skin are considered to be skin stretch sensitive receptors of the discriminative touch system. They also work with the proprioceptors in joints and muscles to indicate the position and movement of body parts.he sensitivity of the receptors to specific stimuli (e.g., touch verses muscle stretch) is determined by the location of the receptor and by the non-neural tissue surrounding the 1° afferent terminal (Figure 2.6). Figure 2.6. The locations of cutaneous (somatosensory) receptors in hairy and non-hairy (glabrous) skin.
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- Stretch or Deep Tendon Reflexes - Upper extremity. A brisk tap to the muscle tendon using a reflex hammer produces a stretch to the muscle that results in a reflex contraction of the muscle. The muscles tested, segmental level, and grading of DTR's are listed below. Levels for DTR's.
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- Distinguish between the types of spinal reflexes. The stretch reflex is a monosynaptic reflex that regulates muscle length through neuronal stimulation at the muscle spindle. The alpha motor neurons resist stretching by causing contraction, and the gamma motor neurons control the sensitivity of the reflex.
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reflex physiology Organ involved: rectum Receptors stimulated: stretch receptors Action: when the rectum is filled with material, stretch receptors signal to the brain that defecation is necessary. As with urination, a sphincter can be consciously controlled to allow for defecation.
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Exercise 19: Somatic Reflexes Patellar reflex. the extension of the knee that occurs when the quadriceps femoris tendon is stretched; a stretched tendon will stretch teh muscle and cause it to contract; this reflex helps prevent injury by preventing muscles from overstretching; the stretch reflex helps maintain posture and equilibrium.
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Understanding the Stretch Reflex (or Myotatic Reflex) The stretch reflex; which is also often called the myotatic reflex, knee-jerk reflex, or deep tendon reflex, is a pre-programmed response by the body to a stretch stimulus in the muscle.he stretch reflex can be activated by external forces (such as a load placed on the muscle) or internal forces (the motor neurons being stimulated from within.) An example of the former is a person holding an empty tray in their outstretched arm and then having a plate of food set on it.
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Understanding the Stretch Reflex (or Myotatic 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.The result is a quick, although mild, contraction of the quadriceps muscles, resulting in a small kicking motion.he 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.
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Powerlab 2 - Reflexes 1 Spinal Reflexes-somatic reflexes mediated by the spinal cord. 2  In the stretch reflex the muscle spindle is stretched and excited by either an external stretch or an internal stretch. 3  The Golgi tendon reflex.
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reflex The sensory side of the reflex arc conveys specificity as to which reflex will be activated. The remainder of the reflex response is governed by the specific synaptic connections that lead to the effector neurons. A familiar reflex is the knee-jerk or stretch reflex. It involves the patellar (kneecap) tendon and a group of upper leg muscles. Other muscle groups show similar reflexes.
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Reciprocal inhibition Thus, when a muscle spindle is stretched and the stretch reflex is activated, the opposing muscle group must be inhibited to prevent it from working against the resulting contraction of the homonymous muscle (Figure 2.2). This inhibition is accomplished by an inhibitory interneuron in the spinal cord.
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- When the physician taps the patellar tendon with a hammer, this action causes the knee extensor muscle to stretch abruptly. This stretch activates the myotatic reflex, causing an extension of the lower leg. (Because the physician taps the tendon, this reflex is also referred to as the deep tendon reflex.
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Understanding the Stretch Reflex (or Myotatic Reflex) The stretch reflex can be activated by external forces (such as a load placed on the muscle) or internal forces (the motor neurons being stimulated from within.) An example of the former is a person holding an empty tray in their outstretched arm and then having a plate of food set on it.he stretch reflex can be activated by external forces (such as a load placed on the muscle) or internal forces (the motor neurons being stimulated from within.) An example of the former is a person holding an empty tray in their outstretched arm and then having a plate of food set on it.