Biology: How Life Works - Standalone book
Biology: How Life Works - Standalone book
2nd Edition
ISBN: 9781464126093
Author: James Morris, Daniel Hartl, Andrew Knoll, Robert Lue, Melissa Michael, Andrew Berry, Andrew Biewener, Brian Farrell, N. Michele Holbrook
Publisher: W. H. Freeman
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Chapter 37, Problem 1QC
Summary Introduction

To explain:

The stiffening of the muscles by the loss of ATP after death.

Concept introduction:

The skeletal muscle contraction is a series of actions that involve various cells and protein complexes, which functions collectively and results in the contraction of the muscles.

Expert Solution & Answer
Check Mark

Explanation of Solution

The ATP (adenosine triphosphate) is required for the generation of energy, which is utilized for the formation of actin-myosin filaments. The ATP molecules are present in a muscle fiber, which is enough for the contraction of muscle to an extent. The regeneration of ATP should be done for the production of energy.

The Creatine phosphate is the energy source from which ADP (adenosine diphosphate) is converted into ATP. The creatine phosphate also has phosphate bonds like ATP. In the presence of ATP, the creatine phosphokinase synthesize creatine phosphate, and energy is stored in excess in the phosphate bonds.

When the animal dies, all the processes stop including the generation of new ATPs. In the absence of ATP, the actin cannot detached from the actin filaments and the muscles will be in the contracted state.

Conclusion

The muscles will be stiffed after the death of an animal as there is loss of ATP.

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