Respiratory System P5

Question 1

Function of the Whole System

Answer 1

Breathing
1. Inhalation: Breathing In = Air rich in oxygen taken in
2. Exhalation: Breathing Out = Air rich in carbon dioxide forced out of lungs

Question 2

Function of Nose

Answer 2

1. Air enters our body through the nostrils
2. Nose passages are warm and moist
3. Fine hairs and mucus act as filters that help to trap dust in the air

Question 3

Function of Windpipe

Answer 3

• Windpipe branches into air tubes and both transport air to and from the lungs

Question 4

Function of Lungs

Answer 4

1. Our lungs are protected by the rib cage and sit on the diaphragm.
2. In the lungs, the air tubes end in air sacs, which have large surface areas that allow for the exchange of gases.
3. Each air sac is surrounded by numerous tiny blood vessels.
4. At the air sacs, oxygen enters the blood and carbon dioxide leaves the blood

Question 5

Breathing Rate

Answer 5

1. Measured as the number of times we breathe within one minute
2. When we exercise, our breathing rate increases because we need to take in more oxygen and remove carbon dioxide produced more quickly
3. Breathing rate affected by how vigorous the exercise is, a person’s age and health condition