Lec 19

Question 1

Three types of muscles

Answer 1

Skeletal muscles

Cardiac muscles

Smooth muscles

Question 2

Slow-twitch oxidative muscles fibers/ Red muscle/ Type I

Answer 2

Large amounts of red myoglobin, numerous mitochondria, and extensive capillary blood supply

Small diameter, darker color due to myoglobin

Smaller force-production

Fatigue resistant

Question 3

Fast twitch glycolytic muscle fibers/ White muscle muscle (Type IIB/IIX)

Answer 3

Large diameter, pale color

Easily fatigued

Question 4

Pathways to resynthesize ATP within

Answer 4

1-Phosphate-creatine system (creatine)
2-Glycolysis (glucose/glycogen)
3-Oxidative phosphorylation (glucose, lipids, amino acids, ketones)

Question 5

What is the biggest challenge of muscle contraction

Answer 5

To keep appropriated levels of ATP