2.2 Microscopic Skeletal + Cardiac Muscle Tissue + microscopic skeletal muscle model with motor end plate FUNCTIONS (LAB)

might be errors idk

Z‐LINE/ Z‐DISC

Borderline between sarcomeres / ONLY THIN/ Actin filaments

I‐BAND

ONLY THIN/ Actin filaments

A‐BAND

Myosin (thick) filaments/ Actin (thin) filaments

H‐ZONE

Myosin filaments

M‐LINE

Myosin filaments and accessory proteins

MYOSIN FILAMENT

Form the "arms" that pull the actin fiber framework towards the M‐line during contraction/ aid in muscle contraction

ACTIN FILAMENT

Forms the framework that is pulled by the myosin filaments machinery/ aid in muscle contraction

ACTIN AND MYOSIN FILAMENTS (IN A‐BAND)

Contraction of the muscle

SARCOPLASMIC RETICULUM (SR)

Repository for Ca++

TERMINAL CISTERNAE (SKELETAL MUSCLE ONLY)

Repository of Ca++/ Propogates action potential from t‐tubules

TRANSVERSE TUBULE

Propogates action potential close to the sarcoplasmic reticulum

TRIAD (SKELETAL MUSCLE ONLY)

Two terminal cisternae and one t‐tubule

TRANSVERSE TUBULE OPENING

Opening that allows action potential to get close to the sarcoplasmic reticulum

SARCOLEMMA

Protects/ guards the interior of the muscle cell/ propogates action potential to the T‐tubules

SARCOPLASM

Holds Nucleus/ holds organelles

MITOCHONDRION

Powerhouse of the cell/ supplies muscle cell with ATP

GLYCOGEN GRANULES

Used to produce ATP/ energy stores

Z‐LINE/ Z‐DISC (CARDIAC)

ONLY THIN/ Actin filaments

I‐BAND (CARDIAC)

ONLY THIN/ Actin filaments

Synaptic Bulb

Takes depolarization wave from the axon causing acetylcholine to enter the synaptic cleft.

Synaptic Cleft

Takes Neurotransmitter and sends it to receptors on the sarcolemma

Motor End Plate/ Sarcolemma with Receptors

Takes a chemical reaction (acetylcholine binding to receptors on sarcolemma) and converts it into a depolarization wave and send it to the continous t-tubules.

Endomysium

Protective covering of the muscle fiber

Nerve Fiber with Myelin Sheath

Propogates nervous impulse/ depolarization wave

Sarcomere

functional contractile unit of muscle cell/fiber

Nucleus of Schwann Cell

???

Synaptic Vesicle

Vesicle that contains acytelcholine

Nucleus of Muscle Fiber/ Cell

???

Myofibril

Makes up the bulk of the muscle fiber/ cell, consists of myosin and actin

Actin

Thin filament that is pulled by myosin during a muscle contraction.

Myosin

Thick filament that pulls by actin towards the m-line during a muscle contraction

Actin and Myosin

Filaments that comprise the myofibril.

M-line (microscopic skeletal muscle model with motor end plate)

center of sarcomere

Sarcoplasm

Gel-like substance that holds filaments and nucleus