Body Organization & Organ Systems

The smallest unit of organization in an animal's body is..

• cells

• organs

• tissues

• organ systems

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Can cells be seen without a microscope?

• Yes

• No

Tissues are a group of _____

• material used to collect mucus

• cells

• organs

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Organs are a group of _____

• cells

• organisms

• tissues

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Which has a more complex job: organs or tissues?

• organs

• tissues

Organ systems are a group of _____

• nerves and veins

• cells and tissues

• organs

If an organ system fails, a person is in danger of death.

• True

• False

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An organism is a group of organ systems working together to create a living being. Which is an example of an organism?

• the nervous system

• a human

• muscle tissue

Everything in the body has a function.

• True

• False

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