7th Grade Unit 3 LS2 Review

What is food ultimately used for in the body?

• energy

• hormones

• growth

• oxygen

Tags

NGSS.MS-LS1-7

Where does the food you eat end up in your body?

• The biggest user of the energy from food in your body is your heart.

• The food molecules enter the individual cells all over your body.

• The food molecules end up in the blood after leaving the digestive system.

• none of the above

Tags

NGSS.MS-LS2-3

Which of the following activities requires you to use energy?

• running

• sleeping

• watching tv

• eating

• all of the above

Answer explanation

Great job! EVERYTHING you do requires energy because your body is always working to make sure you have everything you need.

Tags

NGSS.MS-LS2-3

NGSS.MS-PS3-5

What part of the cell allows water in and out?

• cytoplasm

• cell membrane

• mitochondria

• ribosomes

Tags

NGSS.MS-LS1-2

Explain what happens when a cell shrinks.

Answer explanation

The red blood cell shrank because of diffusion/osmosis. The salt water passed through the cell membrane into the cell because there were more salt particles/molecules outside the cell than inside the cell. As the salt moved through the membrane and into the cell, the water in the cell moved out and the cell shrank.

When food gets further into your digestive system, stomach acid and enzymes begin to coat it and break down the food into its smallest pieces. What kind of digestion happens there?

• mechanical digestion

• chemical digestion

What body system moves food molecules from the digestive system to the cells in your body?

Answer explanation

Circulatory system! Through the blood.

Tags

NGSS.MS-LS1-3

Where does diffusion happen in processing food?

• when food molecules go into cells

• when food breaks down into smaller pieces inside your mouth

• when food is broken down inside the cell

• all of the above

Tags

NGSS.MS-LS1-7

Where does the carbon dioxide we breathe out come from?

• It comes from the body.

• It comes from the air we breathe.

• The chemical reactions between sugar and oxygen produces carbon dioxide as a waste product.

• None of the above

Tags

NGSS.MS-LS1-7

Oxygen enters our body through the _______________.