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The muscular system is the body system that consists of muscles that provide motion and maintain posture. Functions of the Muscular System. Movement - all movements of body are a result of muscle contraction Maintaining posture

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The muscular systemis the body system that consists of muscles that provide motion and maintain posture.


Functions of the muscular system
Functions of the Muscular System

  • Movement - all movements of body are a result of muscle contraction

  • Maintaining posture

  • Stabilizing joints – reinforce and stabilize the joints of the skeleton


Two groups of muscles
Two Groups of Muscles

1. Voluntary muscle - a muscle a person can control

  • Muscles in arms and legs that help you move

    2. Involuntary muscle– a muscle that functions without a person’s control

  • Muscles in your stomach and other internal organs


Types of muscle tissue
Types of Muscle Tissue

  • Smooth muscle - involuntary muscle tissue found in many internal organs

  • Skeletalmuscle– voluntary muscle tissue that is attached to bone

  • Cardiac muscle– specialized muscle tissue found only in the heart


Muscle movement
Muscle Movement

  • Skeletal muscles work in pairs to move your body—one muscle in the pair contracts and shortens, while the other relaxes and lengthens

  • Muscles cannot push, they can only pull so they work in pairs so they can pull in different or opposite directions

  • Tendon – tough tissue fiber that attaches muscles to bones


Head and neck muscles
Head and Neck Muscles

  • Frontalis – covers frontal bone (forehead), raises eyebrows, wrinkles skin of forehead

  • Sternocleidomastoid– side of neck, flex (bend) your neck

  • Trapezius– diamond shape behind neck, moves shoulder, extends neck

  • Deltoid– triangle shaped muscles of the shoulder, shrugging shoulders, moves humerus

  • Latissimusdorsi– middle part of back, moves humerus


Trunk muscles
Trunk Muscles

  • Pectoralis major - fan- shaped muscle covering upper part of chest

  • Rectus abdominis- torso, stomach area, bends the torso and flexes vertebral column


Arm shoulder muscles
Arm/Shoulder Muscles

  • Biceps - front of upper arm, bends arm, flexes elbow

  • Triceps - back of upper arm, straighten arm, extends elbow


Hip leg muscles
Hip/Leg Muscles

  • Gluteus maximus– buttocks

  • Quadriceps (quads) – front of thigh, extends knee

  • Hamstrings– back of thigh, bend/flex knee

  • Gastrocnemius- calf muscle, pull up on heel, point toes

  • Achilles Tendon - connects the calf muscle to the heel bone


How to keep your muscular system healthy
How to Keep your Muscular System Healthy

  • Discontinue exercise if you have a muscle injury

  • Warm up and stretch before you exercise

  • Exercise different muscle groups regularly

  • Maintain your desirable weight

  • Bend at the knees and keep your back straight when lifting heavy objects

  • Select foods and beverages containing carbohydrates and proteins for energy and muscle development

  • Sleep on a firm mattress


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