11) The narrow space that separates the motor neuron and the skeletal muscle fib
ID: 3524623 • Letter: 1
Question
11) The narrow space that separates the motor neuron and the skeletal muscle fiber in a 11) neuromuscular junction is called the A) synaptic vesicle. C) motor end plate. B) synaptic knob. D) synaptic cleft. 12) Acetylcholine is released from a neuron 12) A) by rapid diffusion when a voltage-gated ion channel opens for it. B) by a primary active transport pump. C) by conduction through a gap junction from nerve to muscle. D) through exocytosis when a vesicle fuses with the membrane. 13) Which is the neurotransmitter that causes the release of calcium ions from reservoirs 13) within the muscle cell and thereby initiates the steps of contraction? A) Serotonin C) Acetylcholine B) Norepinephrine D) Acetylcholinesterase 14) The action potential of a muscle fiber occurs A) along the sarcolemma and down the T-tubules. B) in the mitochondria C) at the end plate. D) within the sarcoplasmic reticulum.Explanation / Answer
Q 11
ans synaptic cleft
The space between motor neuron and muscle is known neuromuscular junction or myoneural junction This is the space where neuron releases its transmission or chemical signal. The specific space between motor neuron and skeletal muscle fibre is known as synaptic cleft
Q 12
ans through exocytosis when a vesicles fuses with membrane
Acetylcholine is a neurotransmitter or chemical signal currency. It is released by a neuron when calcium dispositive ions stimulate fusion and fission of vesicles with nerve ending membrane
Q 13
ans The endoplasmic reticulum in muscle cells is known as sarcoplasmic reticulum . This stores a lost of calcium and when neurons release acetylcholine , there gets a biy of depolarisation and calcium ions are released.
Q 14
ans The continuous rise and fall in voltage or potential along the cell membrane which is associated with conduction of nerve impulses is known as actions potential
in muscle fibres the action potential occures along the sarcolemma or cell membrane of muscle cells and interior of T tubes
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