Card Set Information
Anatomy muscle system
body systems- muscle system
Entire muscle is wrapped in what external connective tissue?
Skeletal muscles are made up of what?
fascicles - bundle of indivudual muscle cells
Connective tissue layer surrounding fascicle
Cellular structure that holds the cell's genetic material of the cell
Plasma membrane of the muscle cell
Sarcoplasmic reticulum (SR)
Endoplasmic reiculum for the muscle cell. Its interconnecting tubules surround each myofibril.
Sac like regions of the sarcoplasmic reitculum, lying adjacent to the T-tublues serves as specialized reservoirs of calcium ions.
An invagination of the sarcolemma that pushes deep into the muscle cell's interior.
Triad in muscle cell
A 3-part system that consists of a T-tubule laying between two adjacent terminal cisternae
A cylindrical bundle of contractual fillaments within the skeletal muscle cell.
A cytoplasmic organelle that is the site of ATP synthesis; the powerhouse of the cell.
The intracellular fluid in which the organelles are suspended and molecules and ions are dissolved.
Protein fillaments that make up the myofibril of skeltel muscle cells. Two types of myofilaments: actin (thin) and myosin (thick).
Zig-zag line bisecting the I-line. Z-line is a protein disc that anchors the thin filaments and connects adjacent myofibrils.
A contractile unit that measures from one Z-line to the next.
Muscle tissue that is usually attached to the bone of the skeleton or occasionally the skin.
The muscle tissue found in the walls of the heart
Muscle tissue found mainly in the walls of the hollow organs of the body, such as blood vessles and digestive tract.
Connective tissue that wraps each individual muscle cell (fibers)