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.'
I believe the correct answer is B: The prevention of second-hand smoke. Hope this helped!
-TTL
Sedentary lifestyle, alcohol and drug use, Tobacco, sexual activity, dangerous behavior, and poor nutrition.
I believe it could be yes or no because it doesn’t specify if you did or not but if i were to guess i would say yes because you willingly got on the bus to change the sentence i would say During lunch your friend asked you to comeover after school you say “yeah sure” and get on the bus to go home
