muscle fiber + contraction basics

Question 1

RED, dark muscle color: ↑ mitochondria, myoglobin
↑ oxidative phosphorylation → sustained contraction
called slow twitch

Answer 1

type 1 muscle

Question 2

examples of type 1 muscle

Answer 2

calf: soleus

abdominal muscles

Question 3

↓ red (white) → ↓ mito + myoglobin
anaerobic glycolysis
called fast twitch

Answer 3

type 2 muscle

Question 4

example of type 2 muscle

Answer 4

weight training hypertrophies fast twitch muscles

pectoralis major m.