Muscles Flashcards
Outer connective tissue covering of muscle
Epimysium
Bundle of muscle cells
Fascicle
Contractile proteins in muscle tissue
Actin/Myosin
Specialized organelle that stores/releases calcium
Sarcoplasmic Reticulum
Covering around fascicle, contains vessels and nerves
Perimysium
Regulatory proteins of the muscle cell
Troponin/Tropomyosin
Individual muscle cell
Myocyte
Outer plasma membrane of myocyte
Sarcolemma
Wide sheet of dense regular connective tissue
Fascia
Areolar tissue covering for each muscle cell
Endomysium
Contractile unit of the muscle
Sarcomere
Connects muscle to bone
Tendon
Term used to describe the entire muscle
Belly
Specialized structure of membrane that goes through
T-tubule (transverse)
Cytoplasms of muscle cell; has glycogen and myoglobin
Sarcoplasm cell and assists in signaling
Main function of the muscular system
movement of bones/fluids
Maintaining posture/body position
stablize joints
head generation
Responsiveness or ability to receive and respond to stimuli; plasma membranes changes electrical state (- to +)
Excitability
Ability of muscle tissue to pull on its attachment points and shorten with force.
Contractility
Ability to return to original length when resting, recoil due to presence of elastin.
Elasticity
striated and involuntary
cardiac muscle
non-striated and involuntary
smooth muscle
striated and voluntary
skeletal muscle
Repeated units of contractile and regular proteins that enable shortening and lengthening of the myocyte.
Sarcomere
Arranged in a bundle with heads directed outward in a spiral array around the bundled tails. The central area (tail) is a bare zone with no heads. The thick/darker filament and the A band.
Myosin
Two intertwined strands fibrous actin; globular actin with a binding site. Regulatory proteins associated with this filament. The thin/lighter filament and the I band.
Actin
Each motor neuron and all the muscle fibers it innervates. Motor neuron sitmulates the myocyte by releasing a neurotransmitter.
Motor unit
