Home
Class 12
BIOLOGY
Which ions are involved in muscle contra...

Which ions are involved in muscle contraction ?

A

`Ca^(++),Mg^(++)`

B

`Ca^(++),Na^(+)`

C

`Na^(+),K^(+)`

D

`Mg^(++),K^(+)`

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Muscle Contraction**: Muscle contraction involves the interaction between two types of filaments: thick filaments (myosin) and thin filaments (actin). For contraction to occur, the active sites on actin must be exposed. 2. **Role of Calcium Ions**: In a resting muscle, the active sites on actin are masked by a protein called troponin. When the concentration of calcium ions (Ca²⁺) increases, calcium binds to troponin, causing a conformational change that removes the masking of the active sites on actin. 3. **Binding of Myosin**: Once the active sites on actin are exposed, myosin heads can bind to these sites. This binding is crucial for the contraction process to occur. 4. **Role of Magnesium Ions**: While calcium ions are essential for muscle contraction, magnesium ions (Mg²⁺) play a role in muscle relaxation. Calcium blockers, which can be represented by magnesium, help in the relaxation of the muscle after contraction. 5. **Conclusion**: The primary ions involved in muscle contraction are calcium and magnesium. Calcium is responsible for initiating contraction, while magnesium aids in relaxation. **Final Answer**: The ions involved in muscle contraction are calcium (Ca²⁺) and magnesium (Mg²⁺). ---
Promotional Banner

Similar Questions

Explore conceptually related problems

Which of the following elements are involved in muscle contraction?

During muscle contraction

During muscle contraction

During muscle contraction

Which ion is essential for muscle contraction ?

Cardiac muscle contracts

Cardiac muscles contract