BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

Solutions

Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
1 views

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.

Summary Introduction

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.

Explanation

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...

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Additional Science Solutions

Find more solutions based on key concepts

Show solutions add

One of the characteristics of a nutritious diet is that the diet provides no constituent in excess. This princi...

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

Consider an electron near the Earths equator. In which direction does it tend to deflect if its velocity is (a)...

Physics for Scientists and Engineers, Technology Update (No access codes included)