Muscular SystemMuscular System

MUSCLESMUSCLES

Types of Muscle TissueTypes of Muscle TissueHumans have three different Humans have three different types of muscle tissue.types of muscle tissue.–Smooth MuscleSmooth Muscle–Cardiac MuscleCardiac Muscle–Skeletal MuscleSkeletal Muscle

Skeletal MuscleSkeletal MuscleThese are the muscles that are These are the muscles that are attached to the skeleton.attached to the skeleton.

They are voluntary because the They are voluntary because the contraction can be consciously contraction can be consciously stimulated and controlled by the stimulated and controlled by the nervous system.nervous system.

Cardiac MuscleCardiac MuscleThe muscle that makes up the heart.The muscle that makes up the heart.

Contraction of the cardiac muscle is Contraction of the cardiac muscle is rhythmical; it occurs without outside rhythmical; it occurs without outside nervous stimulation and without nervous stimulation and without conscious control.conscious control.

Smooth MuscleSmooth MuscleThis muscle is located in the walls of This muscle is located in the walls of hollow internal organs. (stomach)hollow internal organs. (stomach)

It is slower to contract than skeletal It is slower to contract than skeletal muscle, it does not fatigue easily.muscle, it does not fatigue easily.

Contraction of this muscle is Contraction of this muscle is involuntary, occurring without involuntary, occurring without conscious control. conscious control.

Functions of Muscles Functions of Muscles The tendons of muscles extend The tendons of muscles extend across joints, stabilizing them. (the across joints, stabilizing them. (the skeleton would fall apart if the skeleton would fall apart if the tendons and ligaments did not tendons and ligaments did not stabilize the joints)stabilize the joints)

Movement (body movement, Movement (body movement, breathing, blood flow, food digestion)breathing, blood flow, food digestion)

Provides heat, which is used to Provides heat, which is used to maintain body temperaturemaintain body temperature

HELPS MAINTAIN POSTUREHELPS MAINTAIN POSTURE

Cirque du soleiCirque du solei

Anatomy of a MuscleAnatomy of a Muscle

Myosin & ActinMyosin & Actin

The body has 640 individually The body has 640 individually named skeletal muscles.named skeletal muscles.

Tendons connect the muscle belly Tendons connect the muscle belly to the bones.to the bones.

It would be impossible for you to It would be impossible for you to do anything without your muscles.do anything without your muscles.

Skeletal muscle comes in pairs. Skeletal muscle comes in pairs. For example (biceps/triceps)For example (biceps/triceps)

Chinese exhibit Chinese exhibit

TENDONS TENDONS

• TENDONS CONNECT MUSCLE TO TENDONS CONNECT MUSCLE TO

BONE. MADE UP OF BOTH BONE. MADE UP OF BOTH CONNECTIVE & MUSCLE TISSUE.CONNECTIVE & MUSCLE TISSUE.

USE OF STEROIDSUSE OF STEROIDSPROSPROS

ENHANCE ENHANCE APPEARANCEAPPEARANCE

INCREASE INCREASE PHYSICAL PHYSICAL ENDURANCEENDURANCE

CONSCONS

Mood swingsMood swings

INCREASES LDLINCREASES LDL

LIVER TUMORSLIVER TUMORS

CANCERCANCER

INFERTILITY & INFERTILITY & BALDNESS IN MENBALDNESS IN MEN

KIDNEY TUMORSKIDNEY TUMORS

SEVERE ACNESEVERE ACNE

SQUIRREL ON STEROIDSSQUIRREL ON STEROIDS