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:
- The increase in intracellular sodium induces the release of Ca⁺⁺ from the sarcoplasmic reticulum.
- Calcium entry from the extracellular space through the voltage dependent Ca⁺⁺ channels.
- 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
Answer:
what do you mean don't understand
Explanation:
you're not telling good information
Scientific explanation has data or statistics that have been tested and experimented to determine outcomes. Stories are subjective information that has no evidence to back up if it’s true or not.
Answer:
The given blank can be filled with latent content.
Explanation:
The latent content signifies the hidden meaning of a dream, that is, present behind the dream's literal content. On the basis of Freud, a dream's latent content signifies the hidden psychological meaning of the dream.
Freud considered that the content of the dreams is associated with fulfillment of wish and recommended that dreams possess two kinds of content. These are latent content and manifest content. The actual literal subject matter of the dream is known as the manifest content, while the underlying significance of these symbols is the latent content.