Test 1 - 40 mc matching on the back 2 short answer...

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40 mc matching on the back 2 short answer questions 1. Spinal Stretch Reflex 1. Function: 1. Regulate muscle length 2. Help maintain posture 2. Sensory receptor? 1. Muscle spindle 3. Simplest Reflex 1. Monosynaptic 4. Simple stretch reflex = spinal stretch reflex 1. Constantly being used to control your position 5. Has the simplest reflex arc—monosynaptic sensory neuron and alphasensory neuron 6. Patella ligament—anterior thigh muscles to your tibia 1. Strike patella ligament, stretching quad, increase in length will be sensed by muscle spindles. 1a generate action potentials, arrive dorsal root, dorsal horn, alpha motor neurons, ventral neuron, acetylcholine is released, contracted, muscle kicks. 75 ms for it to happen 2. Shorten muscle 3. Standing up, using reflex swaying. When you sway forward, increases lengths of calves, sway backwards 2. Golgi Tendon Reflex 1. Function: 1. Protective mechanism 2. Helps prevent excessive muscle contraction 2. Sensory receptor? 1. GTO 3. Can voluntarily suppress, produce excess force 4. 4 bricks, too much 1. GTO sense how much force you are producing, if it becomes excessive, 1B, dorsal root, dorsal horn, inhibiting interneuron (inhibit neighboring structures), excite inhibiting interneuron, greater inhibitory effect, greater effect motor neuron. 2. Stop producing that force, muscles lengthen 5. GTO tells you too much force 1. Lifting weights 3. Flexion-withdrawal and crossed-extensor reflexes 1. Polysnaptic 2. Function: 1. Maintain balance during flexion-withdrawal 2. Reciprocal inhibition? 3. Ex. Have a room mate. You go out for a night. To mess with your brain, room mate arranges furniture 1. You come home, it’s dark, you run into coffee table. You hold your shin 1. When you do that, you are making yourself unstable. Cut your basic support in half, more suspectable to falling and injuring yourself. 2. This is the reflex pathway that lets you to stand on one leg 4. Travel up sensory neuron, dorsal root, dorsal horn, spinal cord (info is shared with alphamotor neurons controlling the knee flexors) multiple synapses. Inhibited alpha motor neurons—knee flexors, withdraw limb
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from ground. Flexion withdrawal. You have to turn off antagonist muscles (quads) inhibiting = reciprocal inhibition (turn off quad muscles) if you don’t, you might get cope contraction, your legs won’t move. Allow knee flexion to occur if turned off 5. Same is used for crossed extensor reflexes. Crosses over to other side of spinal cord. This case extend the extensors. Turn off hamstrings, turn on quad, extend the knee and stiffen the leg. Less susceptible to knee___ stable 6.
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