STRUCTURE AND FUNCTION OF MUSCLES

STRUCTURE AND FUNCTION OF MUSCLES IN BN509
LECTURE 22

Muscle Tissue Types

Three types: skeletal, cardiac, smooth.

Muscle Fiber

Another term for muscle cell.

Myo- and Mys-

Prefixes meaning 'muscle'.

Sarco-

Prefix meaning 'flesh'.

Connective Tissue

Supports and isolates muscle fibers.

Epimysium

Connective tissue wrapping entire muscle.

Perimysium

Connective tissue surrounding fascicles.

Endomysium

Connective tissue between individual fibers.

Tendon

Cord-like structure connecting muscle to bone.

, Aponeuroses

Flat sheet tendons attaching muscles indirectly.

Compartment Syndrome

Pressure within muscle cuts off blood supply.

Contractility

Ability to shorten when stimulated.

Extensibility

Ability of muscle cells to stretch.

Elasticity

Ability to return to resting length.

Sarcomere

Contractile unit of a muscle fiber.

Myofibril

Bundle of myofilaments in muscle fiber.

Actin

Thin myofilament involved in contraction.

Myosin

Thick myofilament that pulls actin.

Neuromuscular Junction

Connection between motor neuron and muscle.