Describe all factors that result in rigor mortis that occurs after the death of an individual....

Describe all factors that result in rigor mortis that occurs after the death of an individual.

Please provide short answers to the following questions:

How is a skeletal muscle fiber categorized as either fast or slow?

Which skeletal muscle fibers have many capillaries and many mitochondria? Why?

What color are oxidative fibers? Justify why.

Suzane was riding her bicycle on a busy street when a car made a sudden right turn out of the left lane of traffic directly in front of her. Though she hit her brakes as hard as she could, she ended up crashing into the rear door of the vehicle at a high speed. Immediately after hitting the ground she felt a sudden, sharp pain in the left side of her thorax and experienced sudden dyspnea (shortness of breath, difficulty breathing). Given her symptoms, what has likely happened to Suzane? Explain as completely as possible the mechanisms behind her injury and symptoms.

Coal miners who spend years inhaling fine coal dust have much of their alveolar surface covered with scar-like tissue. How would this condition affect exchange of gases between alveoli and capillaries? Explain in details.

A track sprinter has just completed a 200-m sprint. His legs are “burning” as lactic acid builds up within his muscle cells. This lactic acid is produced as his muscle cells increase the rate of glycolysis and fermentation to provide the necessary ATP to power the quick muscular contractions necessary during sprinting. The production of excess lactic acid in skeletal muscle cells leads to local acidosis (i.e. decreased pH) of the tissues.

What effect does local acidosis have on the delivery of oxygen to the working tissues?
What is this effect called?
Why is it important in this situation?

Expert Solution

Sydney Mullin answered 1 year ago

Rigor mortis occurs when a body dies. A few hours post-death, the muscles will contract somewhat...

Rigor mortis occurs when a body dies. A few hours post-death, the muscles will contract somewhat and the body will feel stiff. Get a sense of how this feels – have a friend tense up the muscles in their arm without fully bending the joints, then feel their arm – this is a bit like what rigor mortis feels like. The stiffening reduces after 24-72 hours (depending on temperature and other factors). Why does rigor mortis happen? Once a person...

Within several hours after death, human bodies enter a state called “rigor mortis,” where the muscles...

Within several hours after death, human bodies enter a state called “rigor mortis,” where the muscles continue to contract and the tissues of the body “stiffen.” The muscles remain contracted for several days, persisting up until the point at which myofibrils in muscle cells begin to decompose. Given your knowledge of how muscles cells contract, provide a molecular explanation for this phenomenon of rigor mortis.

Describe life after Death?

After death, metabolism shuts down and ATP runs out. As a result, calcium pumps at the...

After death, metabolism shuts down and ATP runs out. As a result, calcium pumps at the sarcoplasmic reticulum stop, so Ca+2 ions diffuse out into the sarcoplasm. Produce a diagram describing the contraction cycle and use it to explain what will be the consequence of a sudden calcium increase in the absence of ATP for the muscles of this person’s body?

Use a model to describe the factors that impact on the health of an individual.

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