Put the follow steps of the somatic motor neuron pathway in order. (Note: not all steps are listed) Group of answer choices Action potential in the upper motor neuron [ Choose ] 5 1 2 4 3 6 Myosin binds Actin [ Choose ] 5 1 2 4 3 6 Calcium goes into cytosol from the sarcoplasmic reticulum [ Choose ] 5 1 2 4 3 6 neurotransmitter is removed from synapse by reuptake [ Choose ] 5 1 2 4 3 6 Action potential in T-tubule [ Choose ] 5 1 2 4 3 6 Calcium triggers release of Acetylcholine
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Place the following in the correct order for the AP to travel from a motor neuron to the skeletal muscle it innervates: 1. Action potential travels down the motor neuron. 2. Acetylcholine is released through vesicular transport into the neuromuscular junction. 3. Acetylcholine binds to receptors on the sarcolemma. 4. Sarcolemma depolarizes. 5. Action potential travels down T-tubules. 6. Sarcoplasmic reticulum releases calcium.
Adi S.
Place the following steps of skeletal muscle contraction in the correct order. You may answer by listing them or providing the corresponding numbers. 1. Calcium ions bind to troponin, exposing myosin binding sites. 2. Acetylcholine is released from synaptic vesicles and diffuses across the synaptic cleft. 3. Acetylcholine binds to receptors on the sarcolemma. 4. Action potential is triggered on the sarcolemma. 5. Calcium ions enter the sarcoplasm. 6. Action potential opens calcium ion channels on the sarcoplasmic reticulum. 7. Calcium ions bind to troponin, exposing myosin binding sites. 8. Myosin binds to actin and heads rotate. 9. Acetylcholine is broken down. 10. Troponin and tropomyosin return to covering the myosin binding site. 11. Calcium ion channels close and calcium ions are pumped into the sarcoplasmic reticulum. 12. Nerve impulse arrives at the axon terminal of the motor neuron.
Place the steps leading to muscle contraction in the correct order: 1. The message travels down the axon of the nerve. 2. The end of the axon of the nerve releases the neurotransmitter, acetylcholine. 3. The neurotransmitter, acetylcholine travels across the space between the axon ending and the muscle. 4. The neurotransmitter, acetylcholine binds to receptors on the muscle. 5. The electrical charge causes calcium to be released into the cytoplasm of the muscle. 6. Calcium allows myosin to bind to the actin. 7. Myosin pulls on the actin causing the muscle to shorten. 8. The potential travels across the muscle cell and deep into the interior of the cell, creating an electrical wave of the action.
Madhur L.
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