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Luda [366]
3 years ago
13

Which one to choose ?(please tell me if u have trouble seeing)

Biology
2 answers:
lions [1.4K]3 years ago
7 0
Beaches change over time as waves move further up the shore would be the best answer.

Explanation :

The erosion of rock formations in the water, coral reefs and headlands create rock particles that the waves move onshore, offshore and along the shore, creating the beach. Continual erosion of the shoreline by waves also changes the beach over time. One change that erosion can cause is the appearance of a headland. ( source : Google )
Korolek [52]3 years ago
6 0

Answer: Option (A) is the correct answer.

Explanation:

Beaches are the places which are part of shore of an ocean, sea, large river etc.

There are pebbles and sand at the shore of a beach. Waves of water in an ocean always change the ocean due to  erosion and addition of sand.

It is the force acted by the wave that pushes or pull the sand in different directions every time the wave comes.

So we can conclude that the statement beaches are always changes due to factors such as waves adding and eroding sand best describes beaches.

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Please describe the signal transmission across a myoneural junction that allows the nervous system to move the muscles of a foot
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The contraction of the muscles (whether at the level of the arms or the legs) and more specifically the muscular fibers of the musculoskeletal system, that is to say organs, in the broad sense of the term, allowing the movement, is normally under the total dependence of the nerves which transmit a nervous command.

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<em>More precisely, acetylcholine is enclosed in vesicles (a kind of tiny sphere-shaped grains) located within the nervous corpuscles located at the end of each neuron. When nerve impulses (stimulation) reach the presynaptic membrane, acetylcholine is released and diffuses into the synaptic cleft (about 50 nanometers wide) filling it. Acetylcholine will at this time bind very briefly to receptors located after the synapse (postsynaptic) and trigger the opening of sodium channels (followed by their closure and an opening of potassium channels). These channels are tiny tubules allowing the passage of ions (atom having lost or gained an electron). </em>

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After this first step acetylcholine is then released and degraded by an enzyme called acetylcholinesterase (AChE) located in the synaptic cleft but also on the postsynaptic membrane. The choline thus released is then recaptured by the presynaptic bodies and reused for the synthesis of new acetylcholine molecules.

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<em>A variety of enzymes called cholinesterases allow the rapid inactivation of acetylcholine. The chemical reaction that causes the contraction of the muscle fiber is a brief phenomenon. Indeed, acetylcholine is very rapidly degraded by cholinesterases. As a result, acetylcholine itself cannot be used in drug form. Nevertheless to circumvent these difficulties other drugs reproduce or prevent the effects of this neuromodulator. These are agonists or antagonists respectively. </em>

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Answer:

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