Muscle Physiology

Question 1

Which of the 3 muscle groups is NOT striated?

Answer 1

Smooth muscle

Question 2

Which muscle group has the HIGHEST energy requirement?

Answer 2

Skeletal muscle, then Cardiac and smooth has the least energy requirement.

Question 3

Alpha motor neuron synapse

Answer 3

Synapse with up to thousands of muscle fibers BUT each individual muscle fiber is only connected (controlled by) 1 alpha motor neuron.

Question 4

Z disc

Answer 4

Anchors for thin (actin) filaments

Question 5

A band

Answer 5

Thicker myosin and actin containing band. DOES NOT change during contraction.

Question 6

I band

Answer 6

Space between adjacent A-bands contains thin (actin) filiaments and Z discs. SHORTENS during contraction

Question 7

H zone

Answer 7

Forms center (lightest part) of A band. contains MYOSIN only. SHORTENS during contraction

Question 8

M line

Answer 8

Located in the middle of H zone and A band. Accessory proteins anchor myosin to M line

Question 9

Titins

Answer 9

Elastic filaments that anchor thick filaments to Z discs (springs)

Question 10

Excitation contraction coupling

Answer 10

Is the physiological process of converting an electrical stimulus to a mechanical response at the neuromuscular junction

Question 11

Does it take ATP for a muscle to relax?

Answer 11

Yes! Thus rigormortus

Question 12

Name the steps of muscle contraction

Answer 12

Question 13

What is a Desomosome and what type of muslce is it found in?

Answer 13

Desomosome: Specialized cell junctions along intercalated disks between cells. Found in Cardic cells.

Question 14

What is a Gap Junction and why is it important to Cardiac cells

Answer 14

Intercellular junction that provide electical conduction to allow beating as a single conductive unit.