breathing system audio SAQs.docx

The Breathing System Audio SAQs - What is the function of the mouth in the breathing system? A. Where air is inhaled - What is the function of cilia in the nose? A. Filter air and trap microorganisms and pathogens. - What are the tiny hairs in the respiratory system that filter air...

The Breathing System Audio SAQs - What is the function of the mouth in the breathing system? A. Where air is inhaled - What is the function of cilia in the nose? A. Filter air and trap microorganisms and pathogens. - What are the tiny hairs in the respiratory system that filter air called? A. Cilia - What is the name of the small flap that closes over the trachea when we swallow to prevent food entering the lungs? A. Epiglottis - What is the function of the alveoli? A. Site for gaseous exchange - List one feature of the alveoli which allow for efficient gaseous exchange. A. There is a large number of alveoli/ they have a large surface area/ their membrane is very thin (one cell thick)/ they have a moist membrane/ huge blood capillary network surrounding each alveolus. - Is inhaling an active or passive process? A. Active - Why is inhaling an active process? A. It requires muscle contraction. - Is exhaling an active or passive process? A. Passive - Why is exhaling a passive process? A. It does not require muscle contraction - What part of the brain controls the breathing rate? A. The medulla oblongata - How does an increase of CO2 in the blood affect breathing? A. Increases frequency and depth of breathes. - Name the process by which gaseous exchange occurs in the alveolus. A. Diffusion - Name a breathing disorder you have studied A. Asthma - Name the site for gaseous exchange in the lungs A. The alveoli - What is the function of the epiglottis? A. Prevents food from entering the lungs.