Grade 4 Human Respiration and Circulation Review

What is respiration?

• Breathing in oxygen and breathing out carbon dioxide

• Eating food and drinking water

• Running and jumping

• Sleeping and waking up

Why does our body need oxygen?

• To get energy from food

• To help us sleep

• To make us taller

• To keep our skin soft

Which of the following happens when we exercise?

• Breathing gets faster

• Breathing stops

• Breathing gets slower

• Breathing becomes impossible

When you are running in a race, your breathing changes. Why does this happen and how does it help your body?

• Breathing gets faster to bring more oxygen to the body for energy

• Breathing gets slower because the body needs less oxygen

• Breathing stops because the body is tired

• Breathing does not change at all

Which part of the upper respiratory system is where air enters our body?

• Throat

• Sinuses

• Nose

• Voice box

What is the main function of the sinuses in the upper respiratory system?

• Passage for air

• Helps us make sounds

• Air spaces in our head

• Where air enters our body

Which part of the upper respiratory system helps us make sounds?

• Nose

• Throat

• Sinuses

• Voice box

How do the parts of the upper respiratory system work together?

• They help us digest food

• They help us see

• They help us breathe

• They help us walk

If a person has trouble making sounds, which part of the upper respiratory system might be affected?

• Sinuses

• Nose

• Voice box

• Throat

Why is the throat important in the upper respiratory system?

• It helps us make sounds

• It is a passage for air

• It is where air enters our body

• It is an air space in our head