Objective 15

Question 0

How long does it take for available stores of ATP to be depleted (hydrolized)?

Answer 0

4-6 seconds

Question 1

Muscle metabolism: Energy for Contraction:

What is the only source for contractile activity?

Answer 1

ATP is the only source used directly for contractile activity

Question 2

How are ATP stores regenerated?

Answer 2

Direct phosphorylation of ADP with creatine phosphate (CP)

Question 3

What is the result of direct phosphorylation of ADP with creatine phosphate (CP)?

Answer 3

1 ATP per molecule of CP with ~15 seconds additional energy

Question 4

What is the result of Anaerobic Glycolysis?

Answer 4

2 ATP per molecule of glucose or lactic acid with ~60+ seconds energy

Question 5

What occurs when muscle contractile activity reaches 70% of maximum?

Answer 5

• Bulging of muscles compress blood vessels, so oxygen delivery is impaired
• so, will utilize glycolysis to net 2 ATP

Question 6

What happens when muscles utilize glycolysis to net 2 ATP?

Answer 6

• Pyruvic acid is subsequently converted into lactic acid

- Lactic acid diffuses into the bloodstream

Question 7

What happens when lactic acid is diffused into the bloodsteam?

Answer 7

• Picked up and used as fuel by the liver, kidneys, and heart
• Converted back into pyruvic acid by the liver

Question 8

What is the result of Aerobic respiration?

Answer 8

32 ATP per molecule of glucose plus release of CO2 and H20 with hours of energy

Question 9

What produces 95% of muscle ATP during rest and during light to moderate exercise?

Answer 9

Aerobic respiration

Question 10

What fuels result from Aerobic respiration?

Answer 10

stored glycogen (in muscle glycosomes), then blood-borne glucose, pyruvic acid from glycolysis, free fatty acids and amino acids