Science respiration

Powerful Essays
Science Form 3 note

SMART STUDY - GOOD LUCK

Teacher zaidi@maher2010

Chapter 1: Respiration

Respiration
Human Breathing
Mechanism

Transport of oxygen

Importance of a healthy respiratory system

Respiratory system

Diffusion of oxygen by blood

Harmful substances

lungs

Transport of oxygen by blood

Effects of pollutants

inhalation

Diffusion of oxygen into cell

Respiratory diseases.

Good habit to improve air quality.

exhalation

Human Respiratory system

PMR 03, 08

1. The human respiratory system consists of:
a. Respiratory organs (nasal cavity, trachea, bronchi, lung and breathing channel)
b. Rib cage
c. Diaphragm
d. Intercostal muscles
Draw figure 1.1 page 2
e. Our body has two lungs (right & left).
f. Each lung consists of the bronchus, bronchioles and alveoli.
Draw figure 1.2 page 2
2. The route taken by the air from the nose till the alveolus can be as follows:

Science Form 3 note

SMART STUDY - GOOD LUCK

Teacher zaidi@maher2010

Breathing Mechanism http://scienceu.fsu.edu http://www.bbc.co.uk/health/kids/breathing.shtml http://www.kidshealth.org/kid/body/lung_SW_p3.html 1. When inhaling
a.

b.
c.

d.

PMR 05, 06

the external intercostals muscle contracts. This causes the ribs to move upwards and outwards. At the same time, the internal intercostals muscle relaxes.
The diaphragm muscle contracts and causes the diaphragm to move downwards and flatten.
The volume of the thoracic cavity increases and with this, air pressure in it becomes lower than the atmospheric air pressure
(air pressure outside the lungs)
This situation causes air from the outside to be sucked into the lung. Draw figure 1.4 page 4

2. When exhaling
PMR 03
a.
the internal intercostals muscle contracts. This causes the ribs to move downwards and inwards. At the same time, the external intercostals muscle relaxes. (the ribs to its original position)
b.
The diaphragm muscle relaxes and

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