L18 - Lecture 18: Chapter 48 Lecture Guide Gas Exchange...

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Lecture 18: Chapter 48 Lecture Guide Gas Exchange Oxygen for cellular respiration a. Respiratory surface (respiratory organ cells): i. Part of animal where gases are exchanged ii. Surface is thin with large surface area 1. Body size 2. Metabolic rate iii. Surface is moist iv. Movement of gases is by diffusion b. Unicellular and simple animals c. Skin breathers 1
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Lecture 18: Chapter 48 Lecture Guide Respiratory Organs d. Gills Counter current exchange system e. Lungs: Structure and function of the mammalian respiratory system i. Larynx-moves epiglottis when swallowing food to cover windpipe ii. Trachea-windpipe (caliginous rings-muscle to control diameter) iii. Bronchus (bronchi-pl.)-branch into bronchioles iv. Bronchiole v. Alveoli-sacs at tip of each bronchiole-deliver O2 to capillaries and take CO2. 1. Surface tension a. Water b. Surfactant-8 months in delivery->breaks the surface tension vi. Diaphragm 2
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Lecture Guide Breathing f. Negative pressure breathing g. Muscle contraction h. Diaphragm contraction-goes down, ribs expand i. Tidal volume-about of air moved with every breath i. About 450 ml of air
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L18 - Lecture 18: Chapter 48 Lecture Guide Gas Exchange...

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