IB Sports Medicine (1.2)

Endomysium

(Inner) layer of tissue surrounding each muscle cell/fiber

Extensibility

Ability to be stretched beyond normal resting length

Contractability

Ability to contract and generate force when stimulated by nerve, muscles in pairs, so when one is contracted the other is elongated

Elasticity

Ability to return to normal original resting length

Origin

Attachment that stays fixed, usually more proximal

Fascicle

Bundle of muscle cells/fibers

Myofibrils

Contain myofilaments whose action is responsible for the contraction of the myofibrils and therefore the muscle as a whole

Smooth

Involuntary, smooth, not striated, walls of blood vessels and organs, stomach and intestines

Epimysium

Layer of tissue that covers the muscle

Muscle Cells (muscle fiber)

Made up of cylindrical structures called myofibrils

Insertion

More distal, attachment that moves

Skeletal

Moves the skeleton, striated, voluntary, biceps, triceps, etc.

Cardiac

Striated, involuntary, found in the heart

Perimysium

Surround and hold together each fascicle