Grade 4 Review Test for the Second Quarter

What organ that serves as the master control unit of the human body?

• liver

• brain

• lungs

• stomach

What organ that pumps blood throughout the body?

• brain

• liver

• lungs

• heart

An organ that provide the structure of our muscles.

A dark-reddish brown organ that helps clean the blood of drugs and other poisonous substances.

• liver

• muscles

• kidney

• heart

The major organs for respiration.

The basic unit of life

A kind of cells that protect and cover the body.

• Skin cells

• Nerve cells

• Bone cells

• Red blood cells

A kind of cells that deliver oxygen to the other cells in the body..

• Red blood cells

• Nerve cells

• Bone cells

• Skin cells

It is made up of several tissues working as a unit to perform a particular function.

Cells have the same in shapes and sizes.

• true

• false