3.7c

When you inhale, what do the muscles next to the ribs do?

• Contract to lift the ribs.

• Relax to lift the ribs.

• Contract to lower the ribs.

• Relax to lower the ribs.

What happens to a lot of the oxygen in the lungs?

• It is turned directly into nitrogen.

• It is turned directly into carbon dioxide.

• It enters the blood.

• It catches fire.

What happens to push blood out of the heart?

• The heart muscle contracts to reduce the volume in the heart chambers.

• The heart muscle relaxes to reduce the volume in the heart chambers.

• The heart muscle contracts to increase the volume in the heart chambers.

• The heart muscle relaxes to increase the volume in the heart chambers.

How is oxygen mainly carried by the blood?

• in the plasma

• on red blood cells

• on white blood cells

• in veins

List the steps of the scientific method

d

e

f

c

b

a

Communicate results

Form a hypothesis

Conduct experiment

Analyze results

Draw conclusions

Ask a question

Tags

NGSS.MS-LS1-6

NGSS.MS-PS2-2

Look at the skeleton in the last question again. What is the name of joint Y?

• elbow

• knee

• shoulder

• hip

Which part of the diagram below causes a force to move the lower arm in the direction shown?

• A

• B

• C

• D

Tags

NGSS.MS-LS1-3

Which is a waste product of human respiration?

• nitrogen

• oxygen

• carbon dioxide

• argon

What is the organ labelled W?

• diaphragm

• lung

• trachea

• oesophagus

Capillaries are adapted to their function by:

• being hollow so that they can carry air.

• having thick walls so that oxygen and nutrients cannot escape.

• having thin walls so that oxygen and nutrients can get out of the blood.

• having holes in the walls so that blood can drain out of them.