OCR A level PE - Gaseous Exchange

Gaseous exchange of O2 & CO2 that occurs at the lungs between the alveoli and the blood is which type of respiration?

• External respiration

• Internal respiration

Gaseous exchange of O2 & CO2 that occurs at the muscles between the blood and the muscles is which type of respiration?

• External respiration

• Internal respiration

O2 combines with haemoglobin to form _____

Which three ways is CO2 transported in the blood?

• Carbaminohaemoglobin

• Dissolved in blood plasma

• Dissolved in water as carbonic acid

• Attaches to white blood cells

O2 moves from alveoli to blood because there is a ____ in the alveoli than the blood

• Higher ppO2

• Lower ppO2

CO2 moves from blood to alveoli because there is a ____ in the blood than the alveoli

• Higher ppCO2

• Lower ppCO2

O2 moves from blood to muscle because there is a ____ in the blood than the muscle

• Higher ppO2

• Lower ppO2

CO2 moves from muscle to blood because there is a ____ in the muscle than the blood

• Higher ppCO2

• Lower ppCO2

There is a higher ppO2 in the alveoli than the blood. So, O2 travels ____the diffusion gradient into the blood.

• Up

• Down

There is a higher ppO2 in the blood than the muscle. So, O2 travels ____ the diffusion gradient into the muscle.

• Up

• Down