In first class lever _________ is at the centre.

Oxygen rich blood enter the heart through the ________________.

The movement of blood through the heart and around the body is called _______________

The heartbeat of an adult human being at rest is between _________.

Which among these blood cells carry oxygen rich blood?

The __________ help to carry blood to every cell of the body in order to supply it with oxygen and nutrients.

The backbone consists of _____ irregularly shaped bones.

The cells that perform a common function are grouped together to form a _______.

Rib cage doesn't protects

Example of pivot joint is 

which of these is a modified lever of the first class?

Lever is a rigid bar or rod that rests on a support called

Tongs are example of 

An example of Wheel and axle is  

An example of movable pulley is