Fill in the blank with the most appropriate word from the bracket.

A group of organs together are called an . (organ system / food pipe / blood)

Fill in the blank with most appropriate word from the bracket.

The small intestine is about _____ feet in length. (30/20/40)

Fill in the blank with the most appropriate word from the bracket.

_____ is the largest organ in the body. (Liver / Kidney / Heart)

Fill in the blank with most appropriate word from the bracket.

Air entering our body is filtered by _____ in the nose. (nasal cavity / wind pipe)

Fill in the blank with the most appropriate word from the bracket.

There are _____ bones in our body. $(206 / 600 / 306)$

To which system do the following organs belong? Write 'D' against Digestive system and 'R' against Respiratory system, 'N'  against Nervous system, and 'C' against Circulatory system.

Write the name of the organs and their functions and write the system they belong.