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3 years ago

Action potential in a motor neuron triggers the release of what neurotransmitter?

Biology

1 answer:

vodomira [7]3 years ago

5 0

Answer:

Action potential in a motor neuron triggers the release of acetylcholine (ACh) neurotransmitter.

Explanation:

Acetylcholine: It is a neurotransmitter released by motor neurons which bind to the receptors end plates of the motor. When an action potential travel down the motor neuron's axon, neurotransmitter release occurs resulting in an influx of calcium and altered permeability of the synaptic terminal membrane.

The Ca2+ ions allow synaptic vesicles to move and bind with the presynaptic membrane which is present on the neuron and released neurotransmitter from the vesicles into the synaptic cleft. Once it's released ACh diffusion occurs across the synaptic cleft to the motor end plate, and binds with ACh receptor. As the neurotransmitter ACh binds, these ions channel open and sodium ions cross the membrane into the muscle cells.

In this phase reduction of voltage inside and outside the cell occurs, which is known as depolarization. When ACh binds to the motor end plate this depolarization is known as end plate potential. Then depolarization spread with the sarcolemma and creating an action potential. This action potential moves the entire cell and creating a wave of depolarization.

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What organisms can get up to 10 centermeters in size

Svetach [21]

<h2>Answer:</h2>

A Single-Celled Organism

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The giants of the deep are so-called xenophyophores, sponge-like animals that—like amoebas—are made of just one cell. They were found during a July research expedition run by the Scripps Institution of Oceanography in La Jolla, California.

The animals are about four inches (ten centimeters) long—among the largest single-celled organisms known to exist.

The creatures were discovered at depths of 6.6 miles (10.6 kilometers). That breaks a previous record for xenophyophores found in the New Hebrides Trench at 4.7 miles (7.6 kilometers).

Xenophyophores represent, "one of the few groups of organisms found exclusively in the deep sea," said Lisa Levin, a Scripps oceanographer who studied the expedition's data.

"If any creatures should be able to live at the ocean's greatest depth, then xenophyophores certainly should be among them."

The Mariana xenophyophores were seen in footage from Dropcams, free-falling devices equipped with lights and digital video that were developed by the National Geographic Society. (The Society owns National Geographic News.)

Protected by thick walls of pressure-resistant glass, the Dropcams were baited to attract whatever marine life might be lurking in the deep. Expedition scientists also saw, for instance, the deepest-swimming jellyfish to date. (Watch a video of the expedition.)

"The deep sea is the largest biome on Earth and holds much of the diversity on the planet—[yet it's still] largely undescribed," Levin said in an email to National Geographic News.

(Also see, "Pictures: Hard-to-See Sea Creatures Revealed.")

According to Jon Copley, a marine biologist at the U.K.'s University of Southampton, "many of the major discoveries in deep-sea biology have come from making direct observations at the seafloor."

"The Dropcam is a great tool for the future, because it can help us see more of what's down there for less cost than using ROVs or submersibles," he said via email.

For instance, "finding xenophyophores far deeper than before shows how much we still have to learn about our oceans depths and their inhabitants."

Tullis Onsott, an expert in deep-sea microorganisms at Princeton University, also called the xenophyophore discovery, "fantastic."

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3 years ago

How is a recessive allele different from a dominant allele apex?

stepan [7]

Recessive and dominant alleles. You will recall that genes have different forms called alleles. An allele can be recessive or dominant. A recessive allele only shows if the individual has two copies of the recessive allele.

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We know of species that are no longer living because we have observations. written records. fossil evidence. we do not know this

Aleksandr-060686 [28]

I'm thinking it might be fossil evidence. Hope it helps!

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velikii [3]

Answer: prophase

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