Gas Exchange Flashcards
identify 5 factors that promote gas exchange at the alveolar/capillary junction
- Warm moist surface
- Extensive capillary network for blood supply
- Short diffusion distance
- Increased partial pressure gradient of gases (O2 CO2)
- Large surface area
What is the primary site of gas exchange in the lungs?
Alveolus
Double layer of cells where gases are exchanged between alveolar air and blood is called what?
Respiratory membrane
What are the 4 steps to oxygen delivery?
- Ventilation of the lungs
- Diffusion
- Perfusion
- Diffusion
What are the 4 steps for removal of CO2?
- Diffusion
- Perfusion
- Diffusion
- Ventilation
Factors which promote external respiration
- Short diffusion distance between alveolus and capillary
- Large surface area of the alveoli
- Abundance of capillaries surround alveoli
- Moist alveolar surface
Where does external respiration occur?
External respiration occurs between alveolus and pulmonary capillaries
Where does internal respiration occur?
Internal respiration occurs between the systemic capillaries and body tissue
What gases is the atmosphere composed of?
CO2
O2
N2
How many o2 molecules can a haemoglobin carry?
4 oxygen molecules
When a haemoglobin has 4 oxygen molecules what is it called?
Oxyhaemoglobin
What is hypoxia?
Absence or depletion of oxygen within cells and tissues
What is hypoxaemia?
Depletion of oxygen within the blood
What is hypercapnia?
Rise in C02 level in the blood
What can change to rhythm of breathing?
- Change in PCO2 levels
- Change in H concentration
- Large decrease in PO2
