Breathing A2 122 – 125 , 130 - 131

Question 1

What is meant by gas exchange?

Answer 1

When you breathe, you tak ein oxygen and let out carbon dioxide.

Question 2

How does respiration occur?

Answer 2

Air enters through your mouth and nose to you trachea, then to your bronchus, then bronchiole, finally reaching the alveolus when the oxygen diffuses into the blood.

Question 3

How do alveoli make gas exchage quick and easy?

Answer 3

They are one cell thick, so oxygen diffuses faster, and million sof them create a larger surface area.

Question 4

What determines how fast you breathe?

Answer 4

How much oxygen your body needs.

Question 5

State 2 factors that can reduce lung volume

Answer 5

• Asthma
• Old age

Question 6

Name 3 diseases caused by smoking

Answer 6

• Cancer
• Heart attacks
• breathing problems
• Stroke

Question 6

State what is meant by passive smoking

Answer 6

When a non-smoker inhales a smoker’s smoke, they have a higher risk of circulatory and respitory diseases.

Question 7

Name 3 things tobacco contains

Answer 7

Tar: A sticky black material that collects in the lung. Narrows the airways and can cause cancer
Nicotine: The addictive drug that speeds the nervous system, is a stimulant that norrows blood vessels and increases heartbeat.
Carbon Monoxide: Replaces oxygen in the red blood cells, so body doesnt recieve enough oxygen

Question 8

Name some diseases smoking causes

Answer 8

• Heart disease: narrows arteries
• Ephysema: Affects walls of alveoli so it cant expand properly, could burst while coughing.
• Respiartory infections: affects cilia which is supposed to move mucus to stomach instead of lungs, causing infection.