Which of the following Protects the Body From Excessive Force Tearing a Muscle


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Skeletal Muscle Reflexes) Which of the following protects the body from excessive force tearing a muscle? the Golgi tendon reflex the spindle reflex the crossed extensor reflex the knee jerk reflex the flexion reflex Question 2 0.1 pts (Ch. 13.3; Skeletal Muscle Reflexes) When a muscle is stretched by an external force, such as extra weight added to a load on an outstretched arm, which of the following is directly activated? the spindle organ sensory nerve the alpha motor neurons the parasympathetic nervous system intrafusal muscle contraction O the gamma motor neurons Question 3 0.1 pts (Ch. 13.3; Skeletal Muscle Reflexes) Proprioceptors are located in the in the muscle fibers O only three of the answers are correct all of the answers are correct intrafusal fibers in ligaments between bones in the Golgi tendon organ Question 4 0.1 pts (Ch. 13.3; Skeletal Muscle Reflexes) In the normal knee jerk reflex, in response to stretching the hamstring the firing rate of the hamstring spindle sensory neurons would _ , then as part of the reflex the firing rate of the alpha motor neurons of the hamstring would increase, stay the same increase, decrease increase, increase decrease, increase decrease, decrease Question 5 0.1 pts (Ch. 13.3; Skeletal Muscle Reflexes) If you artificially caused the sensory neuron of the spindle to fire more frequently, then the alpha motor neuron would increase its firing rate and the muscle would relax. O fire at the same rate and cause no change in muscle tension. increase its firing rate and the muscle would contract. decrease its firing rate and the muscle would contract. decrease its firing rate and the muscle would relax. Question 6 0.1 pts (Ch. 13.3; Skeletal Muscle Reflexes) There is normally alpha-gamma co-activation of extrafusal and intrafusal fibers. When there is alpha-gamma co-activation, it causes the firing rate of the sensory neuron of the muscle spindle to increase. the knee jerk reflex. the firing rate of the sensory neuron of the muscle spindle to not change. the firing rate of the sensory neuron of the muscle spindle to decrease. the intrafusal fibers of the spindle to relax. Question 7 0.1 pts (Ch. 13.3; Skeletal Muscle Reflexes) Regarding the spindle organ, why is alpha-gamma coactivation important? Activating the gamma motor neuron decreases the firing rate of the spindle sensory neuron relative to rest, which signals to the brain that the muscle is contracting. O Activating the gamma motor neuron increases the firing rate of the spindle sensory neuron relative to rest, which signals to the brain that the muscle is contracting. Activating the gamma sensory neuron of the spindle organ when the muscle relaxes signals to the brain what the position of that myotactic unit is. Activating the gamma motor neuron maintains the stretch on the spindle organ, which maintains the firing rate of the spindle sensory neuron during voluntary contraction. The alpha and gamma motor neurons are activated together when an external force stretches the extrafusal and intrafusal fibers, which signals the stretch to the brain. Question 8 0.1 pts (Ch. 13.3; Skeletal Muscle Reflexes) Which of the following is involved in the knee jerk reflex? activation of the Golgi tendon organ activation of the spindle sensory neurons alpha motor neuron inactivation in extensor muscles alpha motor neuron activation in flexor muscles activation of the crossed extensor reflex Question 9 0.1 pts (Ch. 13.3; Skeletal Muscle Reflexes) How do the flexion reflex and crossed-extensor reflex protect the body from harm? They prevent overstretching a muscle. They shift the weight from a leg with a sudden pain in the foot to the other leg. They ensure that pain in the right foot is processed in the left somatosensory cortex. They are required for running away from danger. They ensure that the knee bends properly when stimulated by a tap below the knee. Question 10 0.1 pts (Ch. 13.4; Integrated Control of Movement) Central pattern generators can be activated voluntarily. all of the answers are correct. O two of the answers are correct. require input from the motor cortex in the central nervous system for each movement. generate coordinated rhythmic muscle contractions of several myotactic units.

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