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Sometimes the muscles do not relax and b...

Sometimes the muscles do not relax and become stiff. This condition is known as Rigor Mortis which is due to fall of concentration of

A

Myosin

B

Relaxin

C

Actin

D

ATP

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**Step-by-Step Solution:** 1. **Understanding Rigor Mortis**: Rigor mortis is the postmortem stiffening of the muscles. It occurs after death and is characterized by the inability of muscles to relax. 2. **Role of ATP in Muscle Contraction and Relaxation**: - Muscles contract through the interaction of two proteins: actin and myosin. - Myosin heads bind to actin filaments to form cross-bridges, which allows muscle contraction. - For the muscle to relax after contraction, ATP (adenosine triphosphate) is required. ATP provides the energy necessary for the myosin heads to detach from the actin filaments. 3. **Cause of Rigor Mortis**: - After death, the body stops producing ATP because cellular metabolism ceases. - As ATP levels drop, the myosin heads remain attached to the actin filaments, preventing muscle relaxation. - This results in the muscles becoming stiff and rigid, leading to the condition known as rigor mortis. 4. **Conclusion**: The fall in concentration of ATP is the primary reason for the occurrence of rigor mortis, as it prevents the muscles from relaxing. **Final Answer**: Rigor mortis is due to the fall of concentration of ATP (adenosine triphosphate). ---
**Step-by-Step Solution:** 1. **Understanding Rigor Mortis**: Rigor mortis is the postmortem stiffening of the muscles. It occurs after death and is characterized by the inability of muscles to relax. 2. **Role of ATP in Muscle Contraction and Relaxation**: - Muscles contract through the interaction of two proteins: actin and myosin. - Myosin heads bind to actin filaments to form cross-bridges, which allows muscle contraction. - For the muscle to relax after contraction, ATP (adenosine triphosphate) is required. ATP provides the energy necessary for the myosin heads to detach from the actin filaments. ...
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