Which parts of human body move in one direction only ?

What are the different parts of human body involved in human digestion and mention their function?

Assertion : We are able to move a few parts of our body easily in various directions whereas some parts can be moved in only one direction. Reason : Different types of joints are present in different parts of our body.

Which part of the human body should one use to demonstrate stages in mitosis ?

Which part of human body is the first to be affected by nuclear radiations?

Which part of the human body vibrates to produce sounds?

Assertion : There is no mixing of oxygenated and deoxygenated blood in the human heart. Reason : Valves are present in the heart which allows the movement of blood in one direction only.