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Biology: The Unity and Diversity o...
Biology: The Unity and Diversity o...
After death, calcium pumps no longer function and the calcium ion concentration of muscle fiber cytoplasm increases. The result is rigor mortis —a state or postmortem muscle contraction. Explain why this contraction occurs and why it ends only when myosin heads begin to break down.
To determine: The reason for the occurrence of rigor mortis and why it ends only when the myosin heads initiate to break down.
Concept introduction:
The rigor mortis is mainly caused due to the chemical changes in the muscles post mortem that leads to the stiffness of the body parts. A membrane-bound structure called sarcoplasmic reticulum is a specialized smooth endoplasmic reticulum that mainly functions in the regulation of calcium ions that are present in the striated muscle cells. Calcium is a mineral that is mostly found in teeth and bones that provides them strength.
The rigor mortis mostly occurs due to the absence of oxygen in the cells. As a result, the ATP level decreases in the body. The sarcoplasmic reticulum wraps around the myofibrils functions to store and releases the calcium ions present in the striated muscle cells. After death, the calcium binds to the troponin protein by diffusing out of the sarcoplasmic reticulum...
Chapter 35 Solutions
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