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What is the Respiratory System? RESPIRATORY SYSTEM Its role : is to carry gases between outside air and your blood. When is your respiratory system at work? While singing, talking, laughing, breathing RESPIRATORY SYSTEM Mucus Many parts of the respiratory system are coated with mucus a sticky, thick fluid that traps dust, germs …etc. AIR PATH First : Air enters through the nose or mouth Next : Sinus warm and moisture the air Then : The nose will trap dust and germs. How? By the help of its hairs and layer of mucus After that : Air passes from sinus back of the throat Finally to the larynx Larynx contains the vocal cords LARYNX What happens in the Larynx? Vocal cords stretch across the larynx. The sound of your voice is the result of your breath making the vocal cords vibrate TRACHEA Is a tube that carries air from the larynx lungs The trachea leads to TWO branches called bronchi which go into the lungsbranch into smaller tubes called bronchioles. Trachea Two branches smaller tubes Bronchi Bronchioles ASTHMA A disease in which these tubes may become narrowed. Prevents air from easily traveling through the lungs ALVEOLI The bronchioles end in clusters of tiny thin-walled pouches or air sacs in the lungs These Air sacs called Alveoli What happens in the Alveoli or these air sacs ? It is where oxygen enters the blood and carbon dioxide leaves the blood through Capillaries DIAPHRAM Dome-shaped muscle forms the bottom of the chest area Inhale (Breath In) moves Exhale (Breath Out) moves CILIA Tiny hair liked structures on cells in linings of many parts of respiratory system RESPIRATORY & CIRCULATORY SYSTEMS WORK TOGETHER These 2 systems work together to get oxygen to their cells. The respiratory system gets the oxygen as far as the tiny air sacs inside your lungs. Circulatory system: The blood picks up the oxygen there and carries it to all your cells-all the way down to your toes. IN AIR SAC Two things happen at the same time 1. Oxygen leaves the lungs and enters the blood. 2. Carbon dioxide goes the other way ,It leaves the blood and enters the lungs. the output of one system is the input of the other system. WHEN YOU HOLD YOUR BREATH !! When you hold your breath, carbon dioxide builds up in your blood. Your brain can sense this Without your making a decision, your brain sends a message to the diaphragm and rib muscles telling them to breathe