A Motor Unit Includes — I Hate CBT's

Question: A motor unit consists of:
Answer: a single motor neuron and the multiple muscle fibers it controls.
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Question: motor neurons
Answer: neurons that carry outgoing information from the brain and spinal cord to the muscles and glands
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Question: Muscle fibers are
Answer: multinucleated
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Question: motor end plate (neuromuscular junction)
Answer: the location where the nerve terminates into the muscle, forms a synapse into which neurotransmitter (ACh) is released
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Question: neuromuscular junction
Answer: the junction between a nerve fiber and the muscle it supplies
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Question: end plate potential (EPP)
Answer: Depolarization of the membrane potential of skeletal muscle fiber, caused by the action of the transmitter acetylcholine at the neuromuscular synapse.
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Question: Sarcolemma
Answer: plasma membrane of a muscle fiber
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Question: excitation-contraction coupling
Answer: events that link the action potentials on the sarcolemma to activation of the myofilaments, thereby preparing them to contract
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Question: muscle twitch is
Answer: the contractile response of a muscle to a single brief threshold stimulus
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Question: muscle twitch phases
Answer: 1. latent period
2. period of contraction
3. period of relaxation
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Question: Acetylcholine
Answer: A neurotransmitter that enables learning and memory and also triggers muscle contraction
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Question: A graded depolarization is known as an:
Answer: EPSP
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Question: latent period
Answer: time between application of a stimulus and the beginning of a response in a muscle fiber
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Question: contraction phase
Answer: starts at the end of the latent period and ends when muscle tension peaks
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Question: relaxation phase
Answer: period of time from peak tension until the end of the muscle contraction
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Question: skeletal muscles are connected by what?
Answer: tendons
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Question: skeletal muscles are composed of hundreds to thousands of individual calls are called what?
Answer: fibers
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Question: The term motor unit refers to
Answer: one motor neuron and all of the skeletal muscle fibers it innervates
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Question: a motor neuron and muscle fiber intersection at what is called?
Answer: the neuromuscular junction
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