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.'
They would be used for your abbs
<span> Explain the importance of these activities for getting into college, and invite the friends to join him.</span>
Johnnie's father is 5′11″ tall and weighs 165 lbs. , while his mother weighs 164 lbs. and is 5′2″ tall. Johnnie's chances of becoming obese are at least 30 %.
If child's both the parents obese then the child are 10-20 times more likely to be obese. The weight gain in early childhood between 3 - 5 years is also significantly greater among children with overweight or obese parents .
When it comes to causes for the rise in childhood obesity, have been many possible culprits such as increase in portion of size, type easy availability of high fat , nutrient poor foods, and fewer opportunities for physical activity.
To learn more about the obese here
brainly.com/question/24245651
#SPJ4
