Respiratory System

Purpose of the Respiratory System To provide a constant supply of oxygen to keep your body cells functioning To remove carbon dioxide from the body cells

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Nostrils/Nasal Cavity Nostrils bring air into the body Nasal hair traps dust Air is moistened and warmed in the nasal cavity Mucus produced by glands traps dust, pollen and other materials not trapped by the nasal hair cilia (tiny, hairlike structures) sweep mucus and trapped material to the back of the throat where it can be swallowed

Pharynx a muscular structure at the top of the trachea, containing the vocal cords used by food, water and air Epiglottis - flap of tissue that folds down to prevent food and water from entering the airway

Larynx and Trachea Larynx Trachea Voice box Airway to which the vocal cords are attached windpipe the tube through which air travels from the larynx to the lungs. Strong cartilage prevents the trachea from collapsing Lined with mucous membranes and cilia to trap dust bacteria and pollen

Bronchi Two short tubes that branch off the lower end of the trachea Bronchi branch into smaller tubes The smallest tubes are called bronchioles Carry air into the lungs.

Alveoli Tiny, thin-walled, grapelike clusters at the end of each bronchiole Surrounded by capillaries Where carbon dioxide and oxygen exchange take place http://mhln.com

Breathing and Respiration http://mhln.com

When you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. When you breathe out, or exhale, your diaphragm relaxes and moves upward into the chest cavity. http://mhln.com