APII Study Guides Home Page

Respiratory Study Guide

Gas Exchange

 

Internal and External Respiration

  means decrease

means increase


External Respiration (capillaries and alveoli)

 

Summary of Gas Exchange

Entering Alveolar Capillaries

Alveoli (Inspired Air)

PCO2

PO2

Entering Alveolar Capillaries

PCO2

PO2

 

Summary of Gas Exchange

Leaving Alveolar Capillaries

Alveoli (Expired Air)

PCO2

(Compared to inspired air)

PO2

(Still high but lower than inspired air)

Exiting Pulmonary Capillary

PCO2

(compared to blood entering capillaries)

PO2

 

Internal Respiration (capillaries and tissues)

In the tissue

PCO2

PO2

because cellular respiration constantly uses the O2 to break down glucose and it constantly releases CO2

CO2 leaves the tissues through diffusion.

(high concentration to low concentration)

 

In the capillaries

PCO2

PO2

Blood carries in more O2 so it is high in O2 compared to the tissues

In constantly takes the CO2 away to it is low in CO2 compared to the tissues

O2 leaves the capillaries through diffusion

(high concentration to low concentration)