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White raven [17]
2 years ago
13

Which statement tells the most important factor that allows cells to keep accomplishing their many tasks

Biology
1 answer:
kykrilka [37]2 years ago
8 0

Answer:

the most important factor that allows cells to keep accomplishing their many tasks is ATP

Explanation:

Cells are constantly producing usable energy in the form of ATP which helps them in performing many tasks.

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The prolonged electrical depolarization of cardiac muscle cells that occurs during contraction is due primarily to the persisten
luda_lava [24]

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.
  3. The entry of extracellular Ca⁺⁺ causes the release of more Ca⁺⁺ ions by the sarcoplasmic reticulum, further increasing its intracellular concentration.

This is how the ion that guarantees the duration of the action potential of the cardiac muscle cell is the Ca⁺⁺.

Learn more:

Calcium, sodium and cardiac muscle cells brainly.com/question/4473795

4 0
3 years ago
Use 1 word to summarize each step for the process of translation (total: 5 words).
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Transcription takes place in three steps: initiation, elongation, and termination. The steps are illustrated in the Figure below. Initiation is the beginning of transcription. It occurs when the enzyme RNA polymerase binds to a region of a gene called the promoter.
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