Question

1. Mario is a sprinter at his university taking part in the 100m and 200m sprints. He participated in a sprint meet running several races.
He began the meet by running the 100m race. During this sprint, what is his main source of ATP for muscle contraction?

2. Explain the answer above, comparing how different substrates ( muscle glycogen, liver glycogen, fatty acids) listed are used to produce ATP and under what circumstances.

3. Explain the role of collagen in the healing of a strained ligament of the ankle joint?

4. What properties of protein makes it suitable for the role in healing?

Answer 1

Answer 1:

The main source of ATP for muscle contraction during 100 m sprint is PHOSPHOCREATINE and ANAEROBIC GLYCOLYSIS. Around eighty five percent of ATP comes from Phosphocreatine and ten percent of ATP comes from anaerobic glycolysis. For high intensity exercises like 100 m sprint which lasts for thirty seconds, Phosphocreatine is the main source of ATP.

Answer 2:

Anaerobic glycolysis of muscle glycogen produces ATP during intense and intermittent exercises when muscle glycogen is broken down into glucose which is then oxidised to ATP. This ATP is then used as energy for muscle contraction.

Liver glycogen is broken down into glucose by the process called as Glycogenolysis to provide energy during fasting conditions.

Fatty acids are oxidised through beta oxidation to produce acetyl CoA which enters Krebs cycle to produce ATP.