Question

Arrange the following events in correct chronological order after slaughter: A. ATP depletion
B. Onset of rigor mortis
C. Decline in muscle pH
D. Cessation of blood circulation
E. Actin-Myosin cross bridge formation Choose the correct answer from the options given below:

• A. A, C, E, D, B
• B. A, D, C, E, B
• C. D, A, C, E, B
• D. D, A, C, B, E

Hint:

No oxygen → ATP ↓ → pH ↓ → Rigor mortis

Answer 1

The Correct Option is C

Concept:
After slaughter, muscle undergoes a series of biochemical changes leading to rigor mortis and meat formation.

Step 1: Cessation of Blood Circulation (D)

• Immediately after slaughter, blood flow stops.
• Oxygen supply ceases.

Step 2: ATP Depletion (A)

• Lack of oxygen stops ATP synthesis.
• ATP reserves begin to decline.

Step 3: Decline in Muscle pH (C)

• Glycogen converts to lactic acid.
• Causes pH to decrease.

Step 4: Actin-Myosin Cross Bridge Formation (E)

• Due to lack of ATP, muscle fibers lock.
• Permanent cross bridges form.

Step 5: Onset of Rigor Mortis (B)

• Muscle becomes stiff.
• Final stage of post-mortem process. Final Sequence: \[ D \rightarrow A \rightarrow C \rightarrow E \rightarrow B \] \[ \boxed{\text{Option (C)}} \]