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hram777 [196]
3 years ago
5

Which mineral would be found in greatest concentration in the plasma of the marathon runners?

Biology
1 answer:
andre [41]3 years ago
6 0
The right answer is E. Sodium  (with 140mmol/L)

Sodium is the most important element in the blood and extracellular liquids of the body.The needs of an adult subject are of the order of 1 to 2 g of sodium per day. The normal diet is much richer than our actual needs, about 4g, so it can largely compensate for the needs of an athlete or a runner.
Losses are majoritarly by feces and sweat. The kidney is able to reabsorb almost all the sodium that is filtered: urinary losses can be tiny.
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What type of deafness is present if the bone-conducted sound is heard longer than the air-conducted sound?
NNADVOKAT [17]
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What is incomplete dominance?
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The neuromuscular junction is a well-studied example of a chemical synapse. Which of the following statements describes a critic
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Answer:

A- Acetylcholine is released by axon terminals of the motor neuron.

Explanation:

The general mechanism of muscle contraction can be explained as follows:

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b) The nerve endings then secrete small amounts of neurotransmitter called acetylcholine.

c) The actylecholine binds to the receptors on the membrane of muscle fiber and opens the voltage gated sodium channels.

d) Opening of these channels leads to flow of large quantities of sodium ions into the muscle fiber which ultimately results in initiation of action potential in muscle fiber.  

e) This action potential depolarizes the fiber including the T-tubules, triggering the release of calcium ions from sarcoplasmic reticulum.

f) The calcium ions thus released initiated the process of muscle contraction.

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Thus, the correct option is D.
3 0
3 years ago
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