contains protein fibers (actin & myosin) that facilitate contraction.
What is Myofibrils
100
invitations of sarcolemma that run throughout cell, transfer Action Potential (nervous signal) throughout cell.
What is T-tubules
100
anchored at Z-line
What is Thin filaments (actin molecules)
100
when muscle receives Action Potential from neuron, t-tubules transfer signal throughout cell & ultimately to traids surrounding myofibrils
What is Excitation
200
surrounds entire muscle
What is epimsyium
200
muscle fibers (cells) membrane
What is Sarcolemma
200
stores, release, and reabsorbs calcium
What is S.R. Sarcoplasmic Reticulum
200
Connected at M-line; anchored to Z-line by "titin" strands
What is Thick filaments (myosin molecules)
200
at triads, S.R. release this onto myofibrils in response to Action Potential
What is Calcium
300
surrounds muscle fascicles
What is perimysium
300
Muscle fiber's (cell) cytoplasm
What is Sarcoplasm
300
2 terminal cisternae of S.R. on either side of T-tubule, site of calcium release from S.R. in response to Action Potential carried by T-tubule
What is Triad
300
this has active sites that interact with myosin heads when not blocked by tropamyosin
What is G-actin molecules
300
Calcium bonds to tropoin, changing shape of troponin causing tropomyosin to move off of active sites of G-actin molecules of f-actin strands; once active sites available, bond forms between myosin heads & g-actin active sites; once actin-myosin cross bridge(bond) forms, myosin heads exhibit "power stroke" towards M-line, shortening sarcomere; after contraction occurs ATP required to break actin-myosin bond to "recock" myosin bond.
What is Contraction
400
surrounds muscle cells within a fascicle, contains blood vessel that support cells, and contains nerves that stimulate contraction of cells.
What is endomysium
400
have myosalletites cells outside of sarcolemma
What is muscle fibers
400
consist of thick (myosin) & thin (action) filaments; broken down into repeating units of sarcomeres
What is Myofibrils
400
anchored to f-actin strand and hold tropasmyosin in position
What is Tropinin molecules
400
extends throughout muscle & blend together towards end of muscle & blend with fibers in tendons
What is myofibers
500
attaches to and moves bones of skeleton
What is muscles
500
"muscle stem cells" that repair/replace damaged muscle cells.
What is myosalletite cells
500
"stem cells" that merge with each other producing multi-nucleated muscle fibers; some remain independent as myosattelite cells
What is Myolasts
500
holds together the f-actin strands
What is Nebulin
500
occurs throughtout muscle, shortening muscle, pulling tendons that move bones, skin, or other structures