Science respiration
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
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