SM55_MuscleHistology

Question 1

Prefixes typically used to define muscle tissue

Answer 1

-sacro, -myo

Question 2

The three main muscle types

Answer 2

striated (skeletal and cardiac), non-striated (smooth muscle)

Question 3

Skeletal muscle attaches to _________ ( 4 things)

Answer 3

bone, ligaments, dermis of facial skin, eyeballs

Question 4

Type of muscle: long multinucleated syncytium with peripheral nuclei

Answer 4

skeletal

Question 5

In skeletal muscle:
___________ surround individual fibers
___________ surrounds muscle fascicles
___________ surrounds entire muscle

Answer 5

endomysium, perimysium, epimysium

Question 6

Syncytium

Answer 6

Fusion of multiple cells into one

Question 7

Components of thin filament

Answer 7

actin, troponin, tropomyosin

Question 8

___________ stops myosin of the _____ filament from binding to actin of the _____ filament

Answer 8

troponin/tropomyosin; thick; thin

Question 9

binding of _______ to troponin allows myosin to bind to actin; whereas binding of _____ is required for release of myosin

Answer 9

calcium; ATP

Question 10

Reservoir of calcium in muscle fibers

Answer 10

sarcoplasmic reticulum

Question 11

How does cardiac muscle differ from skeletal muscle:

Answer 11

Obviously, location (in the heart). but structurally..

1. cells are shorter and branch
2. cells have central nuclei
3. cells attach to each other via intercalated disks, which are important for spreading depolarization
4. Different t-tubule structure
5. Cardiac muscle cells contraction is dependent on extracellular calcium ions that enter through the T-tubules
6. Very large mitochondria

Question 12

The thin filaments of _________ do not have troponin

Answer 12

smooth muscle