Inside Living Things

What are the smallest units of life?

• tissues

• organs

• cells

• body systems

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Which one of the following statements is true?

• Only plant cells have cell walls.

• Only animal cells have cell walls.

• Plant cells have a nucleus but animal cells do not.

• Anial cells have a nucleus, but plant celss do not.

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Read this sentence. The immune system produces antibodies. What does the word antibodies mean in this sentence?

• the inner parts of a cell

• masses of similar cells that perform the same function

• people who do not like their bodies

• cells that attack pathogens in the body

How are body systems similar to the players on a sports team?

• They all look the same.

• They all work together.

• They all move quickly.

• They all have muscles and bones.

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Which statement about blood is NOT true?

• Blood brings carbon dioxide to cells and helps remove oxygen from the body.

• Blood contains white blood cells and red blood cells.

• The liquid part of blood is called plasma.

• Blood contains platelets, which help clot blood and stop bleeding.

Which statement about cells is correct?

• They are found only in plants.

• They are found only in animals.

• They are different depending on what they do.

• They are all exactly the same as one another.

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Why does it make sense to learn about the inside of humans, other animals, and plants at the same time?

• because they all need all of the same things to survive

• because their cells all have chlorophyll and cell walls

• because plants make their own food, but animals and humans have to eat food

• because they are all living things made of cells

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Player is related to team as organ is related to __________.

• body system

• tissue

• muscle

• cell

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Which body system controls the movement of blood through the body?

• the respiratory system

• the circulatory system

• the nervous system

• the endocrine system

Which body system includes the brain and controls the senses and thinking?

• the respiratory system

• the circulatory system

• the nervous system

• the endocrine system