Answer:
Option). about 20 percent of the calcium ion required for contraction comes from outside the cell.
Explanation:
Calcium ions play an important role in cardiac muscle physiology. Calcium ions influx is responsible for plateau phase after depolarization. Calcium ions also play role in muscle contraction with the help of troponin (regulatory protein).
For contraction, about 20 percent of calcium ions are supplied from outside of the cell, while rest of the calcium ions are released from SR (sarcoplasmic reticulum).
Thus, the correct answer is 'forth option.'
Because they get negative vibes from the other people who are negative
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Drink warm water it opens your food tube lol
Peers have a huge impact on others attitude and behavior. Bullying or teasing are examples of unhealthy behaviors that peers inflict. This can cause depression and creates a negative environment. A healthy environment is filled with encouragement and love. People work together to solve problems and keep emotions in control. This kind of environment will boost productivity and happiness, especially in a work area. :D