Respiratory System Grade 8 PDF

RESPIRATORY SYSTEM  DIAGNOSTIC TEST What do you know about the respiratory system in humans? Name and explain the functions of the respiratory system organ that you know. Name 3 diseases in respiratory system that you know.  RESPIRATORY SYSTEM The lungs and the tubes wh...

RESPIRATORY SYSTEM  DIAGNOSTIC TEST What do you know about the respiratory system in humans? Name and explain the functions of the respiratory system organ that you know. Name 3 diseases in respiratory system that you know.  RESPIRATORY SYSTEM The lungs and the tubes which join them to the nose and mouth are known as the respiratory system.  NASAL CAVITY Warm and moistens air Gland that produce sticky mucous line in the nasal cavity is called mucous membrane Trap dust, dirt, bacteria and other material that by nasal hairs called cilia PHARYNX Tube-like passageway used by food, liquid, and air At the lower end of the pharynx is a flap of tissue called the epiglottis (to covers the trachea during swallowing so that food does not enter the lungs) HOW EPIGLOTTIS WORKS Normal Swallowing and Breathing Animation (youtube.com) LARYNX “Voice box” The airway to which two pairs of horizontal folds of tissue called vocal cords are attached TRACHEA Air-conducting tube Connects the larynx with the bronchi Lined with mucous membranes and cilia Contains strong cartilage rings BRONCHI Two short tubes that branch off the lower end of the trachea Carry air into the lungs Singular- bronchus BRONCHIOLES Tiny branches of air tubes in the lungs Connect bronchi to alveoli ALVEOLI Tiny, thin-walled, grapelike clusters at the end of each bronchioles Surround by capillaries Where carbon dioxide and oxygen exchange take place Singular- alveolus GAS EXCHANGE Air entering the lungs contains more oxygen and less carbon dioxide than the blood that flows in the pulmonary capillaries. Differences in concentrations assist gas exchange QA MOVING AIR IN AND OUT During inspiration (inhalation), the diaphragm and muscles contract. During exhalation, these muscles relax. The diaphragm comes upwards.  HUMAN RESPIRATORY DISORDER