What is the sequence of events that occurs at the neuromuscular junction?
If the depolarization reaches a certain threshold, an action potential will be generated in the muscle fiber, which will eventually lead to muscle contraction. Therefore, the number sequence, which gives the correct order of events at the neuromuscular junction is (6), (2), (1), (4), (3), (5).
Which of the following events at the neuromuscular junction would occur first?
1. Arrival of the action potential at the synaptic Knob. 4. Release of Ach into the synaptic cleft.
What are the 3 main phases in neuromuscular action potential?
An action potential has three phases: depolarization, overshoot, repolarization.
What occurs at a neuromuscular junction quizlet?
What happens at the neuromuscular junction when the action potential arrives at the axon terminal? The action potential causes the calcium gates to open allowing calcium ions to enter the axon terminal and the synaptic vesicles move toward the membrane.
What are the events that occur at the neuromuscular junction quizlet?
Terms in this set (6)
- Action Potential. Arrives at axon terminal of motor neuron.
- Voltage-gated Ca2+ channels. Open.
- Ca2+ entry causes. ACh to be released by exocytosis.
- ACh diffuses across. synaptic cleft.
- ACh binding. opens ions channels in the receptors allowing passage of Na+ in and K+ out.
- ACh effects are.
What are the 4 basic steps in the sliding filament theory?
In the sliding filament theory, myosin heads attach to an actin filament, bend to pull the actin filaments closer together, then release, reattach, and pull again.
What are the main components of a neuromuscular junction?
The neuromuscular junction (NMJ) is a synapse that develops between a motor neuron and a muscle fiber, and is made up of several components: the presynaptic nerve terminal, the postsynaptic muscle membrane, and the intervening cleft (or gap).
Which event occurs last at the neuromuscular junction quizlet?
Which event occurs LAST at the neuromuscular junction? Sodium enters the muscle fiber. Neurotransmitters enter the synaptic cleft.
What is the correct order of events at the neuromuscular junction?
Place the events at the neuromuscular junction in the order in which they occur: 1.1. Release of acetylcholine (ACh) into synaptic cleft. 2.2. Activation of ACh receptors on motor end plate. 3.3. Termination of ACh activity by the enzyme acetylcholinesterase (AChE) 4.4. Arrival of an action potential at the synaptic terminal of the motor neuron.
Which events occur at the neuromuscular junction?
Motor Neuron. There are two main locations for motor neurons – upper and lower.
What does acetylcholine do at the neuromuscular junction?
In the somatic nervous system, acetylcholine is used at the neuromuscular junctions, triggering the firing of motor neurons and affecting voluntary movements.
What structures meet at the neuromuscular junction?
An AP travels down the axon. to the axon terminal.