Muscle Structure

Question 1

What does the skeletal muscle use as energy metabolism?

Answer 1

• Creatine phosphate - fast energy from ATP, but lasts 1-2 seconds
• glycolysis - energy from glucose in the absence of oxygen ( anaerobic metabolism)
• oxidative phosphorylation - energy from glucose or fat in the presence of oxygen (aerobic metabolism)

Question 2

What is oxygen debt ?

Answer 2

Where the muscle uses more oxygen to produce the energy needed after the exercise has finished - to replenish muscle store of glycogen & CP & to remove lactic acid.

Question 3

Difference between cardiac & skeletal muscle

Answer 3

Contraction of cardiac muscle is dependent on extracellular Ca, skeletal muscle is not
Skeletal muscle has a very short action potential, tetanic contractions can occur, whereas, cardiac muscle has a very long action potential and tetanic contractions cannot occur