T3 ZPOWERPOINTS

Skeletal Muscle

Muscle that is attached to bones and enables voluntary movements.

Endomysium

Connective tissue covering individual muscle fibers.

Fascia

Loose connective tissue that covers and separates muscles.

Myofibril

Long, threadlike structure within muscle fibers that contain thin and thick filaments.

Sarcomere

The functional contractile unit of a muscle fiber, located between Z-lines.

Acetylcholine

A neurotransmitter that stimulates muscle contraction.

Isotonic Contraction

Muscle contraction that results in movement and shortening of the muscle.

Isometric Contraction

Muscle contraction that occurs without movement, increasing tension without changing length.

Motor Unit

A motor neuron and all the muscle fibers it innervates.

Tendon

Connective tissue cord that attaches muscle to bone.

Aponeurosis

Broad, flat sheet of connective tissue connecting muscle to bone.

Motor End Plate

The area of the muscle fiber membrane that synapses with a motor neuron.

Synergist

Muscle that aids the prime mover in a movement.

Antagonist

Muscle that opposes or reverses the action of the prime mover.

Lactic Acid

A byproduct of anaerobic respiration that can cause muscle fatigue.

Fast Fibers

Muscle fibers that contract quickly and fatigue quickly, suited for short bursts of activity.

Slow Fibers

Muscle fibers that contract more slowly and can sustain activity longer without fatigue.

Rigor Mortis

Postmortem stiffening of muscles due to calcium influx and depletion of ATP.

Myopathy

A muscle disease that results in muscle weakness and degeneration.

Beta Oxidation

The metabolic process by which fatty acids are broken down to generate acetyl-CoA.

Glycolysis

The anaerobic process of breaking down glucose to produce ATP.

Tendon Sheath

A protective covering for tendons that allows smooth movement.

Myofibrils

Rod-like units of a muscle cell containing myofilaments.

HSL (Hormone Sensitive Lipase)

Enzyme that breaks down stored fat into fatty acids in adipose tissue.

LPL (Lipoprotein Lipase)

Enzyme that helps transport fatty acids into cells, aiding in energy production.

Motor Control

The regulated and organized movement of muscles by the nervous system.