3. gaseous exchange

Lungs & Thoracic Cavity – Structure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Lungs & Thoracic Cavity – Structure ,[object Object],[object Object],[object Object],[object Object]

Lungs & Thoracic Cavity – Structure ,[object Object],Capillary (less than 1 RBC wide so to distort cell as it travels through to increase its surface area aiding diffusion) Alveolus (thin moist cell wall to assist with diffusion)

Diffusion ,[object Object],[object Object],[object Object],[object Object]

Gases and the Atmosphere ,[object Object],[object Object],[object Object],[object Object],[object Object]

Gases and the Atmosphere ,[object Object],[object Object],Place a bag of M & M’s in a small plastic box and see how many collisions they have with each other as you move the box. Now transfer the same M & M’s into a larger plastic box – notice that they have more space to move and have less collisions.

Measurement & Accuracy ,[object Object],[object Object]

Measurement & Accuracy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Breathing In - INSPIRATION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Breathing In – Expiration (at rest) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Breathing In – Expiration (during exercise) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Breathing – Control of Movements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Breathing – Control of Movements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Breathing – Control of Movements During INSPIRATION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Breathing – Control of Movements During EXPIRATION ,[object Object],[object Object],[object Object],[object Object]

Respiratory System – Volumes and Measurement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Respiratory System – Volumes and Measurement ,[object Object],[object Object],[object Object],RESIDUAL VOLUME IRV ERV TV VC

Respiratory System – Volumes and Measurement ,[object Object],[object Object],[object Object],[object Object],Commonly Used Equations

Gaseous Exchange at the lungs ,[object Object],[object Object],[object Object],[object Object],[object Object],(ATM AIR MIXED WITH ‘STALE’ AIR) Diffusion Gradient Exists – O 2 moves into the CAPILLARY and CO 2 moves into the ALVEOLI

Gaseous Exchange at the Working Muscles ,[object Object],[object Object],[object Object],[object Object],[object Object],Diffusion Gradient Exists – O 2 moves into the MUSCLE and CO 2 moves into the CAPILLARY MYOBLOBIN IS THE MUSCLES EQUIVELANT OF HEAMOGLOBIN, AN OXYGEN CARRIER

Oxygen Dissociation Curve ,[object Object],[object Object],[object Object],[object Object],[object Object]

Oxygen Dissociation Curve ,[object Object],% Hb sat. with O 2 pp O 2 (mmHg) = O 2 Dissociation curve at rest = O 2 curve during exercise when temp & acidity increases making it harder for O 2 to attach to Hb. = Myoglobin Dissociation curve. Has greater affinity for O 2 so can saturate easier.

3. gaseous exchange

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3. gaseous exchange