Muscle Tissue Flashcards

Muscle Tissue

• 40-50% of all body mass

• Causes all body movement

• Vascular: filled with blood vessels

• Three types of muscle tissue: skeletal, cardiac, smooth

Muscle Contraction

• Movement happens when muscles contract and relax

• Contraction happens when electricity is present

• Actin and Myosin help muscles to contract

Muscle Relaxation

• Movement happens when muscles contract and relax

• Relaxation happens when electricity is absent

Muscle Cell

• Also called muscle fibers

• long, skinny cells

• Structure of muscle: muscle > fascicle > muscle fibers

Actin

Thin filaments

Myosin

Thick filaments

Skeletal Muscle

• Location: Attached to bones and sometimes in the skin (ex. face)

• Appearance: Multineucleated; peripherally located nuclei; has striations

• Functions: Voluntary control; movement, maintaining posture, production of heat

Cardiac Muscle

• Location: Found in heart

• Appearance: Centrally located nucleus, has striations, highly branched and interconnected

• Function: Mostly involuntary control; pumps blood through arteries and veins

Smooth Muscle

• Location: found in many organs, ex. stomach, intestines, blood vessels, bladder, eye, reproductive organs

• Appearance: Centrally located nucleus, no striations

• Function: involuntary control, contracts slowly (peristalsis); push and digest food, contractions to prepare for childbirth