External respiration is?

1
Exchange of the gases between the blood and the cells
2
Exchange of the gases between the blood and lungs
3
Combining oxygen with haemoglobin to form oxyhaemoglobin.
4
Transportation of oxygen from lungs to tissues.

Sponsored

hivanix.in

Visit

This quiz is brought to you by hivanix.in

🌐 Web App Development

Quick Navigation