Chapter 6 Flashcards
(19 cards)
Sarcolemma
the plasma membrane of muscle cell
Sarcoplasm
the cytoplasm of muscle cell
sarcoplasmic reticulum
the smooth ER of muscle cell
Sarcosomes
Mitochondria of muscle cell
Muscle fiber
often muscle cells are called muscle fibers which include the components discussed earlier.
Titin
Anchors thick filaments
Alpha Actinin
Maintain myofibril structure by anchoring thin filaments
Nebulin
Maintain myofibril structure by anchoring thin filaments
Tropomyosin
When calcium is bound to troponin it will shift tropomyosin which will reveal active sites on actin. This is what initiates muscle contraction.
Troponin
Where calcium binds to the actin fiber. This will allow for the activation of tropomyosin which leads to muscle contraction.
Intercalated disk
have transverse portion of desmosomes, fasciae adherents, and a lateral portion of gap junctions
ANP
clear areas around the nucleus within cardiac muscle
Unitary
one type of smooth muscle that forms gap junctions. It has a nerve every few cells.
Mutliunitary
the second type of smooth muscle cell that contracts involuntarily. Each cell has its own nerve supply.
Desmin
a protein used for contraction in smooth muscle cells. Unitary contraction uses vimetin and desmin, and multiunitary only uses desmin.
Alpha-beta-crystallin
each cell packed with myofibrils (1-2um), precisely aligned and held by a complex of desmin-plectin-αβ-crystallin, along with costameres
Caldesmon
opens up the myosin-binding site on actin via calmodulin. It also activates the Myosin light chain kinase.
DHSR
DHSR on T-tubule contact Ca+2 channels (ryanodine receptors) on the SR
Ryanodine
DHSR on T-tubule contact Ca+2 channels (ryanodine receptors) on the SR
