"Air leaves the tiny sacs in the lungs to pass into capillaries." What modification is needed in the statement ?

Cluster of air sacs in lungs are called

Cluster of air sacs in lungs are called

What happens when air passes through nasal cavities ?

Consider a class room of dimensions 5 xx 10 xx 3 m^(3) at atemperature 20^(@)C and pressure 1 atm. There are 50 people in the room, each losing energy at an average of 150 watt. Assuming that walls ceiling, floor and furniture are perfectly insulated and none of them absorb heat, what time (in seconds) will be needed for rising the temperature of air in the room to body temperature i.e., 37^(@)C ? (For air C_(P) = (7)/(2)R . Loss of air to outside as the temperature rises may be neglected).

In the pond , we find that different organisms live in different regions. This is due to some conditions like availability of different amount of food, air, light etc. Now let us study the table 4 , showing organisms living in different regions of a pond and answer the question. Are the leaves of all plants growing in a pond, similar? What is the difference between the leaves of a plant growing at the bottom (hydrilla) and.that floating on the surface (lotus)? Try to think and write why we find such differences.

What is the advantage of the wet and warm passage of air from the nostrils to capillaries ?