Muscle Physiology Flashcards Preview

HFF - Exam I > Muscle Physiology > Flashcards

Flashcards in Muscle Physiology Deck (14):
1

Which of the 3 muscle groups is NOT striated?

Smooth muscle

2

Which muscle group has the HIGHEST energy requirement?

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

3

Alpha motor neuron synapse

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

4

Z disc

Anchors for thin (actin) filaments

5

A band

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

6

I band

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

7

H zone

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

8

M line

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

9

Titins

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

10

Excitation contraction coupling

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

11

Does it take ATP for a muscle to relax?

Yes! Thus rigormortus

12

Name the steps of muscle contraction

Q image thumb

A image thumb
13

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

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

14

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

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