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.'
D short term stressor because major life changes deal with your self and there stress is permanent.
The first one, axons can send messages.
I am not sure what you asking, but since Justin doesn't want to go to the graduation party because he know he going to be embarrass from not gradating with the rest of his friends.
I believe the answer is ginger root!
