Which best describes \"rigor mortis\"? Lack of ATP following death causes cross-

Question

Which best describes "rigor mortis"? Lack of ATP following death causes cross-brides to remain tightly bound to actin. Lack of ATP following death causes calcium to remain in the cytosol, continuously stimulating cross-bridge cycling. Repeated, high-frequency action potentials to a skeletal muscle fiber causes sustained contraction following death. Following death, calcium-activated proteases degrade all proteins in skeletal muscle fibers, making muscles limp. Build-up of K^+ in T-tubules causes constant, tetanic contractions of skeletal muscles that last tor about 12 hours following death. Rigor mortis is caused by: buildup of lactic acid. lack of Ca^2+. depletion of glycogen. lack of ATP. deficient acetylcholine receptors. Myasthenia gravis is a collection of muscle disorders that cause muscle fatigue and weakness. What is the major mechanism? overproduction of acetylcholinesterase

Explanation / Answer

8 - Lack of ATP following death causes cross bridges to remain tightly bound to actin

9 - Depletion of Glycogen and Lack of ATP

Explanantion - Rigor Mortis refers to the stiffening of muscles of a individual after death. It is a stage of death.

Rigor mortis is caused due to various reasons that arise after death. When respiration process stops after death, the supply of oxygen to body ends. In muscles the cessation of oxygen, needed for ATP synthesis causes a depletion of ATP molecules required for the seperation of actin myosin bridges that causes the relaxation of muscles. The body also utilizes glycogen in absence of oxygen to produce ATP but it delays rigor mortis only till the glycogen supply gets depleted . Accumalation of calcium, released by detoiration of sarcolemma and sarcoplasmic reticulum also promotes myosin actin cross bridging.

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