Blood collects oxygen from inhaled air and gives off carbon dioxide in the

Respiration which takes place in the absence of oxygen is called

Human beings have specialized structure to carry out exchange of gases called

The blood which is oxygenated in lungs is carried to heart by

Capillaries are

There is higher concentration of oxygen in

The distance which is travelled by an average red blood cell is equal to

The composition of red blood cells have specialized protein called

The small air sacs which are present at the end are called

The number of chambers in a heart is

The process by which glucose reacts with oxygen in cells in order to release energy gradually is called

The process by which energy is released from glucose or other food molecules in the cell of living organisms is called

The function of white blood cells is to provide

Heart is made of specialized

The transport system of blood by special organ heart constitutes

The life span of red blood cells is

Exhaled air is the air which we

The division of windpipe is done in two

A long wind pipe in which air enters when we breathe is called

The upper small chambers are called as