The circulatory system because it carries out cellular respiration and transports nutrients around the body
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.'
Make a plan first then go to look for a buliding to own or rent
Adult alcohol use is not as bad as it is for kids/teens. The adults are ammune to the drink {by now} and the teens are *just* getting used to the drink. It may affect the teens more than It'll affect the adults.
