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Functions of the Muscular System

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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