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Vanyuwa [196]
1 year ago
7

What is/are the variable structure(s) of a nucleotide.

Biology
1 answer:
AysviL [449]1 year ago
8 0

A nucleotide consists of three different structures:

  • A nitrogenous base
  • A five-carbon sugar
  • One or more phosphate groups
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The prolonged electrical depolarization of cardiac muscle cells that occurs during contraction is due primarily to the persisten
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Answer:

The prolonged electrical depolarization of cardiac muscle cells -that occurs during contraction- is due primarily to the persistent influx of calcium ion

Explanation:

The action potential of the heart muscle is longer with respect to skeletal muscle (around 300 milliseconds), and this is due to the activity of calcium (Ca⁺⁺ ) in the intracellular compartment.

The initial depolarization of cardiac muscle fiber depends on the entry of sodium (Na⁺) into the cell. However, for the action potential to occur and be maintained, Ca⁺⁺  must increase its cytoplasmic levels, which depends on:

  1. The increase in intracellular sodium induces the release of Ca⁺⁺ from the sarcoplasmic reticulum.
  2. Calcium entry from the extracellular space through the voltage dependent Ca⁺⁺ channels.
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This is how the ion that guarantees the duration of the action potential of the cardiac muscle cell is the Ca⁺⁺.

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3 years ago
.Which statement best illustrates why carbon is so important to living things?
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<span>Carbon-based macromolecules are found in all life forms.</span>
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A patient undergoing external radiation has developed a dry desquamation of the skin in the treatment area. The nurse teaches th
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The best statement made by the patient to have summed up the effective of the teaching is that "I can buy some aloe vera gel to use on the area".

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chlorophyll

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