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Zarrin [17]
3 years ago
14

PLZ HURRY ITS A TIME LIMIT

Biology
1 answer:
love history [14]3 years ago
3 0

Answer:

a

Explanation

its called erosion

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Helppp pls I need these two 9 and 10 pls
xenn [34]

Answer: Number 9 D

          and Number 10 is D

Explanation:

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2 years ago
Which situation would lead the client's family to suspect onset of dementia?
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The client has increasing experienced disorientaion to familiar surroundings
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During the transmission of signals across a neuromuscular junction, which of the following happens last?
guapka [62]

A neuromuscular junction (or myoneural junction) is a chemical synapse formed by the contact between a motor neuron and a muscle fiber.[1] It is at the neuromuscular junction that a motor neuron is able to transmit a signal to the muscle fiber, causing muscle contraction.

Muscles require innervation to function—and even just to maintain muscle tone, avoiding atrophy. Synaptic transmission at the neuromuscular junction begins when an action potential reaches the presynaptic terminal of a motor neuron, which activates voltage-dependent calcium channels to allow calcium ions to enter the neuron. Calcium ions bind to sensor proteins (synaptotagmin) on synaptic vesicles, triggering vesicle fusion with the cell membrane and subsequent neurotransmitter release from the motor neuron into the synaptic cleft. In vertebrates, motor neurons release acetylcholine (ACh), a small molecule neurotransmitter, which diffuses across the synaptic cleft and binds to nicotinic acetylcholine receptors (nAChRs) on the cell membrane of the muscle fiber, also known as the sarcolemma. nAChRs are ionotropic receptors, meaning they serve as ligand-gated ion channels. The binding of ACh to the receptor can depolarize the muscle fiber, causing a cascade that eventually results in muscle contraction.

Neuromuscular junction diseases can be of genetic and autoimmune origin. Genetic disorders, such as Duchenne muscular dystrophy, can arise from mutated structural proteins that comprise the neuromuscular junction, whereas autoimmune diseases, such as myasthenia gravis, occur when antibodies are produced against nicotinic acetylcholine receptors on the sarcolemma.

3 0
3 years ago
Which two processes form a cycle, with the products of one process becoming the reactants of the other?
DedPeter [7]

Answer:

Cellular Respiration and Photosynthesis

Explanation:

Cellular respiration uses oxygen and sugar and turns it into water and carbon dioxide, photosynthesis uses water and carbon dioxide and turns it into oxygen and sugar.

7 0
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What single cell flourished on earth​
svetlana [45]

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atoms

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