What event directly triggers the release of neurotransmitter shown in a?

What event directly triggers the release of neurotransmitter shown in a summary of events at a neuromuscular synapse?

Summary of events at a neuromuscular synapse. >diffusion of Ca2+ into the axon terminal. A nerve impulse arrives at the axon terminal triggering the opening of Ca2+ channels, which allows for the diffusion of Ca2+ into the terminal. This in turn leads directly to the release of neurotransmitters by exocytosis.

What specific neurotransmitter is released from the axonal terminus as shown in A?


What event initiates the contraction cycle?

What specific event initiates the contraction? Calcium release from the sarcoplasmic reticulum initiates the contraction. Sodium release from the sarcoplasmic reticulum initiates the contraction. Action potentials propagate into the interior of the skeletal muscle fiber.

What neurotransmitter is released to initiate contraction?

The chemical message, a neurotransmitter called acetylcholine, binds to receptors on the outside of the muscle fiber. That starts a chemical reaction within the muscle.

What result would be expected if an additional stimulus?

What result would be expected if an additional stimulus, equal in intensity to the first, were to be applied to the muscle at the 60 millisecond (ms) time point? The muscle would increase in tension to a level greater than that measured at the beginning of phase C.

Which protein functions as a motor protein that applies the power stroke?

myosin head

What are the steps of neurotransmitter release?

Neurotransmitter release from the presynaptic terminal consists of a series of intricate steps: 1) depolarization of the terminal membrane, 2) activation of voltage-gated Ca2+ channels, 3) Ca2+ entry, 4) a change in the conformation of docking proteins, 5) fusion of the vesicle to the plasma membrane, with subsequent …

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How does calcium cause neurotransmitter release?

There the calcium ions interact with the neurotransmitter containing vesicles (membrane-bound containers) causing them to fuse with the cell membrane, and release the neurotransmitters into the synaptic cleft.

What are the steps involved in the life cycle of a neurotransmitter?

The neurotransmitter life cycle can be broken down into six component processes: synthesis, storage, release, receptor interaction, reuptake, and degradation (Beckstead, 1996).

What are the steps of excitation?

Terms in this set (6)

  • Action potential spread along the sarcolemma to the T-tubules (transverse tubules)
  • Calcium is released into the sarcoplasmic reticulum (S.R.)
  • Calcium binds to actin and the blocking action of the tropomyosin is removed.
  • Myosin heads attach to begin contraction.

What causes the release of ca2+?

The neurotransmitter acetylcholine diffuses across the synaptic cleft, causing the depolarization of the sarcolemma. The depolarization of the sarcolemma stimulates the sarcoplasmic reticulum to release Ca2+, which causes the muscle to contract.

What are the steps of the contraction cycle?

Terms in this set (6)

  • Step 1: Contraction Cycle Begins. Begins with the arrival of calcium ions within the zone of overlap.
  • Step 2: Active-Site Exposure. …
  • Step 3: Cross-Bridge Formation. …
  • Step 4: Myosin Head Pivoting. …
  • Step 5: Cross-Bridge Detachment. …
  • Step 6: Myosin Reactivation.

What are the 12 steps of muscle contraction?

12 Steps On How Muscle Contractions Take Place In Your Body

  • A nerve impulse travels to the neuromuscular junction on a. …
  • Ach is released from the axon to receptors located on the. …
  • The binding Ach causes depolarization of the sarcolemma by. …
  • Na+ ions diffuse into the muscle fiber and depolarization. …
  • Depolarization creates a wave of action potential (electrical.
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What are the 6 steps of muscle contraction?

Terms in this set (6)

  • Ca2+ release from SR terminal Cisterinae binding site exposure.
  • Myosin head binding to actin binding sites.
  • Release of ADP & Pi Causes power stoke.
  • ATP causes Myosin head to be released.
  • ATP is hydrolyzed, re-energizes the Myosin head.
  • Ca2+ pumped back into SR terminal cisterine.

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