In rapid elbow extension, a component of throwing, movement velocity is increased by Later (delayed) antagonist burst Earlier (advanced) antagonist burst O Smaller agonist burst O Larger antagonist burst
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- The disease poliomyelitis (po′le-o-mi′˘e-li′tis) destroys motor neurons, causingloss of muscle function and even flaccid paralysis. Some patients recoverbecause axon branches form from the remaining motor neurons. Thesebranches innervate the paralyzed muscle fibers to produce motor unitswith many more muscle fibers than usual. How does this reinnervation ofmuscle fibers affect the degree of muscle control in a person who hasrecovered from poliomyelitis?Neuromuscular Junction: -Activation of nicotinic ACh receptors in the motor end plate results in both Na+ influx into and K+ efflux from the muscle fiber - An action potential in a motor neuron always produces a graded depolarization in the motor endplate and an action potential in the sarcolemma. -Acetylcholine released from the motor presynaptic terminal binds to voltage-gated ACh receptors in the motor endplate. -all of the above -a and b are rightOf the three causes of muscle fatigue below, which would be the most unlikely cause? O central nervous fatigue true muscular fatigue O synaptic fatigue DELL
- Explain how more than one smooth muscle cell can be influenced by an action potential generated in an autonomic postganglionic nerve terminalProvide a explantion and diagram of the Intracellular mechanism of smooth muscle relaxation via antagonists such as atropine binding and blocking muscarinic receptors M3. explain how Atropine blocks the acetylcholine receptorsHow do whole muscles contracts harder with a larger stimulus? O Increase in muscle tone O Increase in muscle hyperplasia OIncrease in motor unit activation 券 )Increase in motor end plates
- Spasticity of the paralyzed muscles in UMN lesions is associated with :-a- inhibition of tendon jerksb- remarkable wasting of the musclec- clonusd- non of the aboveif 2 clenches produce a reponse the excat same force of contration would the emg reoding also have to be the same response. Why or why notA fixator is a muscle that immobilizes a bone and creates a stable base. Why is this important? a. O b. O c. It allows the agonist to relax and not work as hard O d. It allows the agonist to direct as much force as possible into the prime movement Contraction of the fixator directly assists the antagonist with its action It causes the antagonist to relax, making the prime movement easier