What causes rigor mortis? Choose all that apply. Ca2+ leak out of the sarcoplasmic reticulum, which results in myosin binding to actin. No more ATP is being made. Without the binding of ATP, the myosin head will not release from actin. Voltage-gated Na+ and K+ channels continue to open and close. The somatic motor neuron continues to send signals.

When a person dies, the body undergoes gradual changes. The changes are: Rigor mortis - stiffening of the body due to locking of muscles in the contracted positionLivor mortis - discoloration of the skin as the blood is no more circulating and purplish tinge where RBCs settle down (towards the surface where the body is resting, due to gravitational force). Algor mortis - the temperature of the body drops as all functions on the cellular level stop and the body attains the same temperature as the surroundings.The Correct Options: Ca2+ leaks out of the sarcoplasmic reticulum, which results in myosin binding to actin A regulatory protein prevents the binding of myosin head to actin. When Ca2+ is released from the sarcoplasmic reticulum it binds to the regulatory protein, allowing the bridge formation between actin and myosin. The sliding motion continues. Even after death, the presence of Ca2+ leads to the latching of myosin head to actin. No more ATP is being made. Without the binding of ATP, the myosin head will not release from actin There is no oxygen intake, and cells cannot make ATP by anaerobiosis for long thus the ATP levels fall in the body. The myosin head after pulling the actin filament is released by using the energy released by the breakdown of ATP into ADP + Pi. As ATP is no more available, the myosin head cannot be released from the actin, resulting in a constant pull of the actin filament. Incorrect Options: Voltage-gated Na+ and K+ channels continue to open and close. The voltage-gated channels cannot operate as the cell death sets in. Without oxygen, all cell functions come to a halt and the cell dies. The somatic motor neuron continues to send signals Neural activity is among the first activities that cease after death. Oxygen consumption of the brain is highest in the body. Almost 1/5th of the oxygen carried by the blood is used by the brain. Hence motor neurons stop relaying the signals soon after death.

Answered: What causes rigor mortis? Choose all…

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		Ca²⁺ leak out of the sarcoplasmic reticulum, which results in myosin binding to actin.
		No more ATP is being made. Without the binding of ATP, the myosin head will not release from actin.
		Voltage-gated Na⁺ and K⁺channels continue to open and close.
		The somatic motor neuron continues to send signals.