Muscles

MUSCLES Muscle – Organ that contracts and relaxes (returns to regular length). As a result, body parts move. Tendon – thick bands that attach muscles to bones Over 600 muscles in our body

Functions of Muscular System Movement (produces heat in your body as you do work) Gives your body its shape

TWO KINDS OF MUSCLES Voluntary muscles – CAN control Examples: Arm, leg, neck, face Involuntary muscles – CAN’T control Examples: Heart, lungs, brain, intestines, eye lids

THREE TYPES OF MUSCLE TISSUE Skeletal – has striations (stripes) –most common – contract quickly –move bones (attached to bones) –voluntary (we can control) Example: Biceps and Triceps

* Smooth – no striations –found in internal organs –involuntary (we do not consciously control) –contract and relax slowly (ex: form the walls of the stomach and intestines, blood vessels, bladder)

Cardiac – has striations –the heart muscle –involuntary

Skeletal muscles work together in pairs – one contracts, one relaxes Muscles pull, never push contract relax contract relax

Types of Muscles Draw and complete the table in your journal

NameVoluntary Or Involuntary Examples Or Location Appearance 1.Skeletal muscle VoluntaryBiceps Triceps Striated 2.Smooth Muscle InvoluntaryIntestines Bladder Blood vessels Smooth Or No striations 3. Cardiac Muscle InvoluntaryOnly in The heart Striated