Microanatomy of Muscle

Differentiate between epi-, peri- and endo-mysium.

Differentiate between atrophy and hypertrophy. Which organelle is affected and how (in each one)?

Describe what myofibrils are made of and why these are important in the process of contraction.

How are cardiac muscle cells different from skeletal muscle cells? How are smooth muscle cells uniquely different from cardiac and skeletal fibers?

What do Transverse Tubules do for muscle contraction? (click all that apply)

• conduct the action potential throughout the muscle cell

• stimulate sarcoplasmic reticulum to release calcium

• pull actin toward the M line in the sarcomere

• pull actin toward the z lines on sarcomeres

Which of the following belong in a muscle FIBER? (check all that apply)

• T Tubules

• Myofibrils

• sarcoplasmic reticulum

• perimysium

• neuromuscular junction

How do cardiac and skeletal muscles get their striations? (aka "lines")

• pattern of actin and myosin in sarcomeres

• lines on the sarcolemma

• T-tubules

• Z-lines

Anaerobic metabolism (glycolysis) can create a net ___ ATP

• 2

• 34

• 120

• 6

Aerobic metabolism alone can create ___ ATP.

• 34

• 2

• 18

• 12

How many ATP are needed for EACH myosin head to be prepped for contraction and release for the next contraction?

• 2

• 1

• 6

• 10