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Biology 12 Chapter 14 Respiration - 24
1.
Which of the following are the sites of gaseous exchange?
a) Terminal bronchioles
b) Alveolar duct
c) None of these
d) Alveoli
2.
How man alveoli are present in lungs?
a) 70 million
b) 7000 million
c) 70 billion
d) 700 million
3.
What is the total surface area covered by alveoli in lungs?
a) 70-80 m^2!
b) 80-90 m^2!
c) 60-80 m^2!
d) 70-90 m^2!
4.
What is the thickness of each wall of alveolus?
a) 0.1 nm
b) 1.0 µm
c) 0.1 µm
d) 1.0 nm
5.
Where do blood capillaries are present in alveolar ducts?
a) Inside each alveolus
b) Outside each alveolus
c) Arteries are present, not capillaries
d) Veins are present, not capillaries
6.
What type of epithelium line each alveolus have?
a) Squamous epithelium
b) Moist epithelium
c) Cartilage
d) Moist squamous epithelium
7.
Where do pulmonary arteries and veins unite, in alveolar ducts?
a) Inside each alveolus
b) Arteries are present, not veins
c) Outside each alveolus
d) Veins are present, not arteries
8.
What is the characteristic of squamous epithelium cells?
a) Thin
b) Can reduce distance for diffusion
c) All of these
d) Flattened
9.
What is the characteristic of squamous epithelium cells?
a) Curved
b) None of these
c) Thick
d) Can increase distance for diffusion
10.
What is present outside the alveolus?
a) Arteries
b) Blood capillaries
c) Veins
d) Nothing
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