Y7 B1,2 L3 Gas Exchange

Which of these is true?

• There is more oxygen in the air we breathe in than the air we breathe out

• There is more carbon dioxide in the air we breathe in than the air we breathe out

• There is more nitrogen in the air we breathe in than the air we breathe out

• There is more water vapour in the air we breathe in than the air we breathe out

Why is there more oxygen in inhaled air than in exhaled air?

• Oxygen is needed by the body for respiration

• Oxygen is produced in the body by respiration

• Carbon dioxide is needed by the body for respiration

• Carbon dioxide is produced by the body during respiration

Through which part of the respiratory system does oxygen pass into the blood stream?

• Alveoli

• Bronchioles

• Trachea

• Bronchi

Why is there less carbon dioxide in inhaled air than in exhaled air?

• Oxygen is needed by the body for respiration

• Oxygen is produced in the body by respiration

• Carbon dioxide is needed by the body for respiration

• Carbon dioxide is produced by the body during respiration

Which of these is true?

• There is less oxygen in the air we breathe in than the air we breathe out

• There is less carbon dioxide in the air we breathe in than the air we breathe out

• There is less nitrogen in the air we breathe in than the air we breathe out

• There is more water vapour in the air we breathe in than the air we breathe out

What is the name of the process by which oxygen moves into the blood stream and carbon dioxide moves into the alveolus?

• Gas exchange

• Breathing

• Ventilation

• Respiration

Gas exchange occurs because oxygen and carbon dioxide move from a place of high concentration to an area of low concentration. What is this process called?

• Diffusion

• Osmosis

• Respiration

• Breathing

The alveoli have features that help to speed up gas exchange. Which correctly describes the features of alveoli?

• Thin walls, large surface area, good blood supply

• Thick walls, large surface area, good blood supply

• Thin walls, small surface area, good blood supply

• Thin walls, large surface area, poor blood supply

How many cells make up the wall of an alveolus?

• 1

• 2

• 3

• 4

What gives the alveoli such a large surface area?

• There are lots of them and they are really small

• There are few of them and they are really small

• There are lots of them and they are really big

• There are few of them and they are really big