what cellular event is indicated by a?

What cellular event is indicated by A? >exocytosis. Neurotransmitters stored in synaptic vesicles are released into the synaptic cleft by exocytosis.

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

What event directly triggers the release of neurotransmitter shown in A? 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.

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What protein is indicated by letter E?

a) Which protein is indicated by the letter E? Myosin tail groups form the extended regions of the thick myofilament. 20.

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What is the role of CA ++ in muscle contraction?

Calcium triggers contraction by reaction with regulatory proteins that in the absence of calcium prevent interaction of actin and myosin. Two different regulatory systems are found in different muscles.

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Is an enzyme known as acetylcholinesterase present in the synaptic cleft?

Acetylcholinesterase is a type-B carboxylesterase enzyme located primarily in the synaptic cleft with a smaller concentration in the extrajunctional area. Acetylcholinesterase is secreted by the muscle and remains attached to it by collagen fastened to the basal lamina.

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Which lettered protein functions as a motor protein?

Myosin II is an elongated protein formed by two heavy chains with the heads of the motor and two light chains. Each myosin head contains the binding site for both actin and ATP.

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What cellular event is indicated by a?

What cellular event is indicated by A? >exocytosis. Neurotransmitters stored in synaptic vesicles are released into the synaptic cleft by exocytosis.

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Which letter represents an A dark band?

The A bands, labeled here with the letter Z, are the regions of the sarcomere that do contain the thicker, darker myosin filaments. And so they are sometimes called the dark bands. The outer edges of the A bands are darkest as they contain both actin and myosin filaments overlapping.

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Which of the following is composed of myosin protein?

A sarcomere is the basic contractile unit of muscle fiber. Each sarcomere is composed of two main protein filaments—actin and myosin—which are the active structures responsible for muscular contraction.

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Where is the enzyme acetylcholinesterase found?

Acetylcholinesterase (AChE) is a cholinergic enzyme primarily found at postsynaptic neuromuscular junctions, especially in muscles and nerves. It immediately breaks down or hydrolyzes acetylcholine (ACh), a naturally occurring neurotransmitter, into acetic acid and choline.

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What is the role of an enzyme known as acetylcholinesterase is present in the synaptic cleft?

An enzyme known as acetylcholinesterase is present in the synaptic cleft. What is its role? >to break down acetylcholine. Acetylcholinesterase breaks acetylcholine apart, terminating the synaptic transmission.

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What is another name for acetylcholinesterase?

The main type for that purpose is acetylcholinesterase (also called choline esterase I or erythrocyte cholinesterase); it is found mainly in chemical synapses and red blood cell membranes.

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Is acetylcholinesterase present on the presynaptic membrane?

In contrast, acetylcholinesterase (AChE) may be presynaptic or anchored in the basal lamina, as well as postsynaptic at neuromuscular junctions.

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