Science - The Need to Respire

Question 1

Why do we need to respire?

Answer 1

The body must continuously bring oxygen to body cells and get rid of CO2.

Question 2

Name the different gases in the Earth’s atmosphere and give their percentages.

Answer 2

Nitrogen - 78%
Oxygen - 21%
CO2 and other gases - 1%

Question 3

Why is there more oxygen than nitrogen in the atmosphere?

Answer 3

Nitrogen has a high heat capacity and low volume expansion when exposed to heat.

Oxygen has low heat capacity, and high volume expansion when exposed to heat.

We would explode.

Question 4

What are the differences between breathing and respiration?

Answer 4

Breathing is just a phase. It is the movement of air inside the lungs. Muscles are involved. Energy is released. It takes place in and out of the lungs.

Respiration is the overall exchange of gases between the atmosphere, blood, and cells. Muscles are NOT involved. Energy is also released. It takes place in ALL body cells.

Question 5

Taking air in and out of the lungs

Answer 5

Breathing

Question 6

Exchange of oxygen and CO2 between the AIR and the BLOOD in the lungs

Answer 6

External Respiration

Question 7

Exchange of oxygen and CO2 between the BLOOD and the BODY CELLS

Answer 7

Internal Respiration

Question 8

Using oxygen to break down sugar in food.

Answer 8

Cellular Respiration

Question 9

What does cellular respiration produce?

Answer 9

1. ATP (Adenosine triphosphate) as energy
2. CO2 as waste

Question 10

Use of oxygen by the cell

Answer 10

Oxidation

Question 11

Hollow space with coarse hairs coated in mucus (with mucus glands)

Answer 11

Nasal cavities

Question 12

Common passageway for food and air

Answer 12

Pharynx