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Muscle Spindle
The muscle spindle is a proprioceptor. a sense organ that receives information from muscle, that senses STRETCH and the SPEED of the stretch. When you stretch and feel the message that you are at the ENDPOINT of your stretch the spindle is sending a reflex arc signal to your spinal column telling you not to stretch any further. This sense organ protects you from overstretching or stretching too fast and hurting yourself.
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Golgi Tendon Organ
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The golgi tendon organ is a proprioceptor, sense organ that receives information from the tendon, that senses TENSION. 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.
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