Muscle Tissue Flashcards
4 Gen Properties of Muscle Tissue.
- Contractility
- Excitability
- Extensibility
- Elasticity
The ability to be stretched or extended
Extensibility
ability to shorten forcibly
Contractility
The ability to recoil and resume the original resting length
Elasticity
ability to receive and respond to stimuli
Excitability
Three types of muscle tissue are…
skeletal, smooth, and
cardiac
Responsible for most body movements, maintain posture, stabilize joints, and generate heat.
Skeletal muscles
Found in the walls of hollow organs and tubes, and move substances through them, help
maintain blood pressure, squeeze or propel substances
(i.e., food, feces) through organs.
Smooth Muscles
Found in the heart and pumps blood throughout the body
Cardiac muscle
Briefly Explain the Anatomy of Muscles
yay!
General term for connective tissue sheets
Muscular fascia
Three (3) muscular fascia, which separate and compartmentalize individual muscles or groups of muscles
- Epimysium
- Perimysium
- Endomysium
fine sheath of connective tissue composed of reticular fibers surrounding each muscle fiber
Endomysium
Muscle cell plasma membrane
Sarcolemma
Cytoplasm of a muscle cell
Sarcoplasm
Prefixes used to refer to muscle
Myo, mys, and sarco
Muscle contraction depends on two kinds of myofilaments:
actin and myosin
densely packed, rod-like contractile elements.
Myofibrils
Contains the active sites to which myosin heads attach during contraction
G actin
Regulatory subunits bound
to actin.
Tropomyosin and troponin
(thin) myofilaments
Actin
(thick) myofilaments
Myosin
The smallest contractile unit of a muscle.
Sacromeres
Sarcomeres are bound by_____
Z disks
When (a) a sarcomere (b)contracts, the Z lines move closer together and the____ gets smaller.
I band
Band that stays the same width and, at full contraction, the thin filaments overlap
A band
Extend the entire length of an A band
Thick filaments (myosin)
Extend across the I band and partway into the A band.
Thin filaments (Actin)
A coin-shaped sheet of proteins (connectins) that anchors the thin filaments and connects myofibrils to one another
Z-disc
M lines appear darker due to the presence of the
Protein Desmin
