Muscle Flashcards
What muscle cell has smooth ER, specialized for calcium sequestration
(trapping) and release
Sarcoplasmic reticulum
What skeletal msucle is delicate layer of reticular fibers that immediately surrounds individual muscle fibers
Endomysium
A bands are what coloiur
dark bands
what band makes the myosin filaments and actin overlap
A band
What colour are I bands
Light bands
What band contain actin only
I band
_________ is the basic functional repetitive contractile subunit of striated muscle
Sarcomere
Sarcomeres are the segments of the myofibril between what 2 lines
z lines
when a muscle contracts each sarcomere _______ and becomes ________
Shortens, thicker
what happens to the I band during contraction and during a relaxed state
I band shortens during contraction and widens in a relaxed state
Which band has individual myosin filaments that do not move, causing the width to not change during contraction
A bands
Which band causes the H band to narrow during muscle contraction
A bands
What are intercalated disc in cardiac muscles
junctions between cardiac muscle cells (AKA cardiac myocytes or
myocardial cells)
Where can smooth muscle be found
Visceral muscle
In smooth muscle _______ have random placement of actin and myosin that do not form sarcomeres
non-striated
