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Muscular System

  1. Three types of Muscle
    1. Skeletal Muscle
  1.    attached to bones   
    1. lets us bend & twist joints
    1.     controls our every move
    2.     Men
    1. 40% of body weight
    1. Women
    1. lower muscle mass, more fat
    1. largest muscle: gluteus maximus; smallest: middle ear
    1. Smooth Muscle
    1. controls movements of internal systems
    1. digestive, circulatory, urinary, reproductive
    1. Only one is in the heart
    2. All muscle
    1. mostly protein
  1. Your Skeletal Muscle
    1. Long & smooth
    1. attached to bones
    2. actions & counteractions
    1. contract & relax
    2. antagonists
    1. Flat Muscle
    1. diaphragm- breathing
    2. sphincter muscle- circular
    1. anus
    1. Abdomen
    1. canít be protected by bones
    1. stomach expansion, pregnancy
    2. 3 strong muscles instead- abdominal
    1. Tendons
    1. connect muscles to bones
    1. fingers
  1. Contracting Muscle
    1. chemicals
    1. myosin & actin (proteins)
    1. makes the myofibrils of a muscle cell slide over each other to shorten the cell
    2. shorten by up to 1/3
    1. stronger contractions involve more cells
    1. Glucose + Oxygen
    1. = energy
    1. Exercise- increases cell size
    1. lactic acid- when oxygen isnít in the proper quantity
    2. muscles need oxygen
    1. all times- before & after exercise
    1. red muscle, white muscle
    1. red
    1. lasts long
    1. white

a. more force

  1. How you Scratch you Nose
    1. nervous system controls muscles
    1. muscles contract

2. if our nervous system was less efficient, we could punch ourselves in the face

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