3 Muscle Types + Strain vs Sprain

Cardiac Muscle

(Location, Appearance, Control & Function)

L: forms the myocardium of the heart

A: striated, fibers branch, single nucleus, intercalated disks (contract without stoppage!)

C: involuntary

F: contraction of the heart

Smooth Muscle

(Location, Appearance, Control & Function)

L: inside walls of hollow organs

A: non-striated, individual fibers, one nucleus

C: involuntary

F: blood vessel diameter, peristalsis, push urine

Skeletal Muscle

(Location, Appearance, Control & Function)

L: attached to bones by tendons

A: striated, striped by actin (light) and myosin (dark) protein bands, multinucleated

C: voluntary

F: movement, thermogenesis, posture, organ protection

Strain

injury to muscle or tendon from being overstretched or torn

Sprain

injury to a joint when a ligament is overstretched or torn

arteries

away from the heart

veins

towards the heart