What is the ion triggering exocytosis?
Thus, calcium ions trigger the process called exocytosis whereby a fusion pore is temporarily created to allow the release of neurotransmitters into the synaptic cleft. It binds calcium and easily penetrates the lipid bilayers of the membrane.
What is a container of many neurotransmitter molecules?
Synaptic Vesicle. Container of many neurotransmitter molecules. Na+ Ion entering muscle fiber through open chemically gated ion channels.
Are primarily responsible for depolarization events at the muscle cell membrane called?
The muscle cell membrane is called the sarcolemma and the cytoplasm, the sarcoplasm. The sarcolemma has the property of excitability and can conduct the electrical impulses that occur during depolarization.
What causes the release of calcium ions into the sacral plasma from the terminal cisterns?
Yes, an action potential in the T tubule causes the release of calcium from the terminal cisternae of the sarcoplasmic reticulum. The binding of calcium to which molecule causes the myosin binding sites to be exposed? when calcium binds to troponin, troponin releases tropomyosin, exposing the myosin binding sites.
Which of these ions triggers exocytosis of synaptic vesicles?
The influx of calcium ions into the ” ” triggers exocytosis of synaptic vesicles.
Why do calcium ions cause exocytosis?
Calcium-dependent exocytosis is the biochemically controlled fusion of the bilipid secretory vesicle membrane with the bilipid cell membrane, triggered by the binding of several Ca2+ ions to control proteins such as synaptotagmins anchored at the interface between these two membranes.
What event directly triggers the release of neurotransmitter shown in A?
What event directly triggers the release of neurotransmitter shown in A? > diffusion of Ca2+ into the axon terminal. An enzyme known as acetylcholinesterase is present in the synaptic cleft.
What specific neurotransmitter is released from the axonal terminus as shown in A?
Acetylcholine is released by axon terminals of the motor neuron.
Which ion is required for exocytosis of ACh?
The calcium influx triggers synaptic vesicles, which package neurotransmitters, to bind to the presynaptic membrane and to release acetylcholine into the synaptic cleft by exocytosis.
What triggers the process to release acetylcholine?
The release of acetylcholine occurs when an action potential is relayed and reaches the axon terminus in which depolarization causes voltage-gated calcium channels to open and conduct an influx of calcium, which will allow the vesicles containing acetylcholine for release into the synaptic cleft.
What triggers exocytosis of synaptic vesicle contents from an axon terminal quizlet?
Yes, opening of these channels causes calcium to move into the axon terminal. Calcium inside the neuron causes the vesicles to merge with the membrane and release the neurotransmitter via exocytosis into the synaptic cleft.
What type of cells use regulated exocytosis?
-doesn’t happen unless it is triggered by a specific stimulus -trigger that is usually an increase in intracellular [Ca2+] -only specialized cells like neurons, endocrine or goblet cells use this form of exocytosis Where are the proteins and neurotransmitters packed into vesicles in regulated exocytosis? And when are they secreted?
Why is the intracellular calcium ion concentration elevated during rigor mortis?
During rigor mortis, this elevation of calcium ion concentration in the cytosol is permanent because ________. If a muscle fiber were to suddenly and permanently stop producing ATP the fiber would no longer be able to actively transport calcium out of the cytoplasm (sarcoplasm) and the intracellular calcium concentration would rise.
What triggers the opening of an ion channel?
Binding of acetylcholine to a receptor triggers the opening of an ion channel. A toxin released by certain bacteria can block the release of neurotransmitters into a neuromuscular synapse. What would result from such a block?