The Respiratory System

1
The Respiratory System

• Thinking Questions

2
What is the main function of the respiratory
system?
3
What is the main function of the respiratory
system?

• Supplies O2 (Oxygen) to the blood and removes CO2
  (Carbon dioxide) from the blood

4
How are oxygen, carbon dioxide, and other waste
gases exchanged in the lungs and body tissues?
5
How are oxygen, carbon dioxide, and other waste
gases exchanged in the lungs and body tissues?

• Oxygen, carbon dioxide, and other waste gases are
  exchanged by diffusion between body cells and
  blood

6
What causes air to move into and out of a
person's lungs?
7
What causes air to move into and out of a
person's lungs?

• The movement of the diaphragm and rib cage
  creates a change in air pressure

8
How is the work of the digestive system related
to the respiratory system?
9
How is the work of the digestive system related
to the respiratory system?

• The digestive system provides glucose (from
  carbohydrates) needed for cellular respiration.
  The respiratory system provides the oxygen need
  for cellular respiration.

10
Why do capillaries surround alveoli?
11
How is the work of the digestive system related
to the respiratory system?

• The digestive system provides glucose (from
  carbohydrates) needed for cellular respiration.
  The respiratory system provides the oxygen need
  for cellular respiration.

12
Why do capillaries surround alveoli?
13
Why do capillaries surround alveoli?

• So that oxygen and carbon dioxide can be
  exchanged easily by diffusion through the cell
  membranes.

14
How are lungs excretory organs?
15
How are lungs excretory organs?

• They release waste products (carbon dioxide and
  excess water).

16
How does the oxygen in the alveoli get to the
body cells?
17
How does the oxygen in the alveoli get to the
body cells?

• Oxygen diffuses into capillaries, where it is
  picked up by hemoglobin and taken in the
  bloodstream to all body cells

18
You have just finished jogging for 10 minutes and
your chest is heaving. Why?
19
You have just finished jogging for 10 minutes and
your chest is heaving. Why?

• The body uses more oxygen during exercise. Your
  lungs inhale and exhale faster when you exercise
  to give your body cells more oxygen.

20
Why do cells need oxygen?
21
Why do cells need oxygen?

• Cells need oxygen to release energy from glucose
  (cellular respiration).

22
Explain the difference between respiration and
breathing.
23
Explain the difference between respiration and
breathing.

• Breathing is the process in which air moves into
  and out of lungs. Respiration is the process in
  which oxygen is used to release energy from the
  glucose in cells.

24
How does your diaphragm contracting help in
inhaling?
25
How does your diaphragm contracting help in
inhaling?

• When muscles contract, they become smaller and
  pull. The diaphragm contracts and moves down,
  creating a bigger space in the chest cavity for
  air to fill the lungs.