PHYSIOLOGY
SARCOMERE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
What two chemicals are necessary in a muscle cell for muscle contraction to occur?
|
|
Niacin and Potassium
|
|
|
Calcium and ATP
|
|
|
Sodium and Potassium
|
|
|
Ach and Potassium
|
Explanation:
Detailed explanation-1: -(1) Calcium binds to troponin C, causing the conformational shift in tropomyosin that reveals myosin-binding sites on actin. (2) ATP then binds to myosin.
Detailed explanation-2: -Ca++ ions are pumped back into the SR, which causes the tropomyosin to reshield the binding sites on the actin strands. A muscle may also stop contracting when it runs out of ATP and becomes fatigued. The release of calcium ions initiates muscle contractions.
There is 1 question to complete.