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WORKSHEET 7.2 Gaseous Exchange Exchange across across the Respiratory Surfaces and and Transport of Gases in Humans Humans 1.
a.
Complete the figure below ______________ ______________ blood back back to the heart
___________________ ___________________blood blood from the heart
oxygen
[ 2 marks ]
carbon dioxide b. Match the feature features s of alveoli alveoli to to their their functio functions ns A large number number of alveoli in the lungs Walls are made of a single layer of cells
Gases can dissolve in the moisture and diffuse easily across walls Can transport oxygen to and carbon dioxide away from the cells
Walls secrete a thin lining of moisture
Gases can diffuse easily across thin walls
Surrounded by a network of blood capillaries
Increase surface area for exchange of gases
[ 4 marks ] _________________________________________________________________________________________ WAJA BIOLOGY 2009 JPN PERAK
2. The diagram below shows the exchange of gases in the lungs and the transport of blood to the body cell. Study the figure below and complete the sequence . 7.2/1
In the alveolus, high _________ pressure of __________
Oxygen _________ into the blood capillaries
Oxygen combines with the _____________ to form __________________
Oxyhaemoglobin is transported to the ___________
In the cells _______partial _____________ of oxygen
oxyhaemoglobin breaks down and releases _________ and_____________ _________________________________________________________________________________________ WAJA BIOLOGY 2009 JPN PERAK
the lungs Walls are made of a single layer of cells
2.
moisture and diffuse easily across the walls Can transport oxygen to and carbon dioxide away from the cells
Walls secrete a thin lining of moisture
Gases can diffuse easily across thin walls
Surrounded by a network of blood capillaries
Increase surface area for exchange of gases
Diagram below shows the exchange of gaseous in the lungs and the blood transportation to the cell. Study the figure below and complete the sequence . 7.2/3
In the alveolus, high partial pressure of oxygen
Oxygen diffuses into the blood capillaries
Oxygen combines with the haemoglobin to form oxyhaemoglobin
Oxyhaemoglobin is transported to the cells
In the cells low partial pressure of oxygen
oxyhaemoglobin breaks down and releases oxygen and haemoglobin
haemoglobin combines with carbon dioxide to form
_________________________________________________________________________________________ WAJA BIOLOGY 2009 JPN PERAK
