Respiratory System Gas exchange http://ed.ted.com/lessons/what-do-the-lungs-do-emma-bryce

W O R K T G E H Why do we breathe? Think of all the reasons why we need a respiratory system.

Respiratory System Functions: Provides oxygen to the blood Removes CO2 from the blood http://biology.clc.uc.edu/graphics/bio105/breathing.gif

Cells Many different types of cells are formed during embryonic development.

Organization of the Body Levels of Organization Eleven Organ System

Levels of Organization Molecule Cell Tissue Organ Organ system Organism

Homeostasis The body maintains stable internal conditions which are relatively constant

Homeostasis & the Respiratory System body = trillions of cells: needs FOOD (digestive) and AIR (respiratory) Cellular Respiration: C6H12O6 = O2  CO2 + H2O + ATP THEREFORE supply of O2 in blood CRITICAL for homeostasis Without O2, cells cannot make energy CO2 must also be managed so that this waste doesn’t accumulate to problematic levels.

Respiratory System Organs Alveoli Bronchi Bronchioles Diaphragm Larynx Lungs Nose Trachea http://louisville.edu/medschool/physiology/lung.jpg http://biology.clc.uc.edu/graphics/bio105/respiratory.jpg

Structure Bronchi/Bronchus Bronchioles

Warning: terminology! “Respiration” is used several different ways: Cellular respiration is the aerobic breakdown of glucose in the mitochondria to make ATP. Respiratory systems are the organs in animals that exchange gases with the environment. “Respiration” is an everyday term that is often used to mean “breathing.”

Moving air in and out During inspiration (inhalation), the diaphragm muscle moves DOWN During exhalation, these muscles relax. The diaphragm moves upwards.

Alveoli The alveoli are thin- walled pockets which are the site of gas exchange.

Gas exchange Air entering the lungs (alveoli) has more O2 & less CO2 than the blood that flows in the pulmonary capillaries How do these differences in concentrations assist gas exchange?

Circulation and Gas Exchange Gas exchange at the lungs moves oxygen into cells and carbon dioxide out (Diffusion) Clear connection between circulation and the respiratory system.

Oxygen transport Hemoglobin= iron in blood Hemoglobin binds to O2 that diffuses into the blood stream. Red blood cell transports oxygen to all body cells