During a crime scene investigation, the coroner confirms that rigor mortis has set in. This helps to confirm an approximate time of death. The forensic nurse can explain this process (rigor mortis) to a group of students based on the fact that
A)
troponin is being prevented from forming a cross-bridge between the actin and myosin.
B)
activated by ATP, cross-bridges become attached to the actin filament.
C)
the myosin head catalyzes the breakdown of ATP to provide the energy need so that a cross-bridge can be formed.
D)
at death, the body is unable to complete the actin/myosin cycle and release the coupling between the myosin and actin, creating a state of muscular contration.
Ans:
D
Feedback:
As the muscle begins to degenerate after death, the sarcoplasmic cisternae release their calcium ions, which enable the myosin heads to combine with their sites on the actin molecule. As ATP supplies diminish, no energy source is available to start the normal interaction between the actin and myosin, and the muscle is in a state of rigor until further degeneration destroys the cross-bridges between the actin and myosin.
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