Multiple Choice Questions
1.Mucus in the respiratory tract helps to
¡@(1)warm the air up.
¡@(2)moisten the air.
¡@(3) trap the dust particles in the air.
a.
(1) and (2) only
b.
(1) and (3) only
c.
(2) and (3) only
d.
(1), (2) and (3)
2.Which of the following structure(s) is / are found in the nasal cavity?
¡@(1)ciliated epithelium
¡@(2)mucus-secreting cells
¡@(3)hairs
a.
(1) only
b.
(1) and (2) only
c.
(2) and (3) only
d.
(1), (2) and (3)
3.The trachea is supported by many C-shaped cartilages. These cartilages
a.
trap dust particles and bacteria.
b.
warm up the inhaled air.
c.
vibrate and produce sound.
d.
keep the trachea open for breathing.
4.In humans, gas exchange occurs in the
a.
larynx.
b.
alveoli.
c.
trachea.
d.
bronchi.
5.Which of the following is / are true for alveolus?
¡@(1)thick wall
¡@(2)well-supplied with blood capallaries
¡@(3)large surface area
a.
(1) only
b.
(2) and (3) only
c.
(1), (2) and (3)
d.
None of the above
6.Inside the thoracic cavity, the lungs are enclosed by
a.
inner and outer pleural membranes.
b.
inner and outer cell membranes.
c.
inner and outer synovial membranes.
d.
inner and outer plasma membranes.
7.Which of the following pathway is correct?
a.
Nostril --> nasal cavity --> bronchus --> trachea --> alveolus
b.
Nasal cavity --> trachea --> alveolus --> bronchus --> nostril
c.
Nostril --> nasal cavity --> trachea --> bronchus --> alveolus
d.
Trachea --> nostril --> nasal cavity --> bronchus --> alveolus
8.Which of the following pairs comparing inhaled and exhaled air is correct?
¡@Inhaled airExhaled air
a.
21% oxygen16% oxygen
b.
4% carbon dioxide0.03% carbon dioxide
c.
saturated with water vapourvariable amount of water vapour
d.
about 37 oCvariable temperature
9.Which of the following diseases is not caused by smoking?
a.
Lung cancer
b.
Hepatitis A
c.
Coronary heart disease
d.
Emphysema
10.Transport systems are required in large organisms but not in small ones because
a.
the surface for diffusion is too large.
b.
the distance for which substances must travel is too large for diffusion alone to be effective.
c.
oxygen must be transported to cells.
d.
blood must be transported to cells.
11.Blood consists mostly of
a.
white blood cells.
b.
red blood cells.
c.
blood platelets.
d.
water.
12.Blood without blood cells is known as
a.
plasma.
b.
water.
c.
serum.
d.
lymph.
13.Which of the following helps to reduce the entry of bacteria into the body?
a.
White blood cells
b.
Red blood cells
c.
Blood plasma
d.
Haemoglobin
14.Which of the following is incorrect?
Red blood cellWhite blood cellPlatelet
a.
carry carbon dioxidekill pathogens for blood clotting
b.
circular biconcaveirregular shapepieces of broken cells
c.
no nucleuswith nucleusno nucleus
d.
red in colourno colourno colour
15.White blood cells
¡@(1)engulf and digest bacteria intracellularly.
¡@(2)produce antibodies against bacteria.
¡@(3)take part in blood clotting.
a.
(1) and (2) only
b.
(1) and (3) only
c.
(2) and (3) only
d.
(1), (2) and (3)
16.Which of the following is a function of the valves in the human heart?
a.
To increase the blood pressure
b.
To prevent the backflow of blood
c.
To slow down the flow of blood
d.
To decrease the blood pressure
17.Which of the following about the three types of blood vessels is incorrect?
¡@ArteryVeinCapillary
a.
carries blood awayreturns bloodconnects artery from the heartto the heartand vein
b.
thick wallthin wallvery thin wall
c.
no valves except thewith valvesno valves pulmonary artery and dorsal aorta
d.
very slow blood flowvery rapid blood flowvery rapid blood flow
18.Which side of the heart carries deoxygenated blood?
a.
Left
b.
Right
c.
Upper
d.
Lower
19.The exchange of materials between blood and body cells takes place in the
a.
heart.
b.
arteries.
c.
veins.
d.
capillaries.
20.The diagram below shows a longitudinal section of a vein and the adjacent skeletal muscles:
¡@Which of the following description is correct?
¡@skeletal musclesvalve Pvalve Q
a.
contractingopenclosed
b.
contractingclosed open
c.
relaxing openclosed
d.
relaxing openopen
21.An artery has a thicker wall than a vein because the artery
¡@(1) has to contract rhythmically to pump the blood forward.
¡@(2) has no valves to prevent the backflow of blood.
¡@(3) has to withstand high blood pressure.
a.
(1) only
b.
(3) only
c.
(1) and (2) only
d.
(2) and (3) only
22.The following set-up is used to compare the exhaled and inhaled air :
¡@When exhaling air through M, which of the following is correct ?
¡@Colour of indicator
¡@Clip X
¡@Clip Y
¡@Tube 1
¡@Tube 2
a.
closed
open
yellow
red
b.
closed
open
red
yellow
c.
open
closed
red
yellow
d.
open
closed
yellow
red
23.Old red blood cells are destroyed in
¡@(1)bone marrow.
¡@(2)liver.
¡@(3)spleen.
a.
(2) only
b.
(3) only
c.
(2) and (3) only
d.
(1), (2) and (3)
24.When blood is oxygenated in the lungs, its colour becomes
a.
blue.
b.
bright red.
c.
dull red.
d.
pink.
25.Which of the following is NOT a feature of blood capillaries?
a.
branching
b.
differentially permeability
c.
the wall allows red blood cells and plasma proteins to pass through
d.
thin wall
26.The major function of the pleural fluid is to
a.
supply oxygen and nutrients to the lungs.
b.
protect the lungs from physical damage.
c.
reduce the friction between the lungs and the rib cage.
d.
keep the lungs moist and warm.
27.The following are the steps of transporting oxygen in an air sac. Arrange them in their correct sequence.
¡@(1)oxygen diffuses across a capillary wall
¡@(2)oxygen dissolves in moisture film
¡@(3)oxygen diffuses across the wall of an air sac
¡@(4)oxygen combines with haemoglobin
a.
(1), (3), (2), (4)
b.
(2), (3), (1), (4)
c.
(2), (4), (3), (1)
d.
(3), (1), (2), (4)
28.What happens to the diaphragm muscles and intercostal muscles when a man inspires?
¡@Diaphragm musclesIntercostal muscles
a.
contractcontract
b.
contractrelax
c.
relaxcontract
d.
relaxrelax
29.What changes to the thoracic cavity are being brought about when a man expires?
a.
The volume and pressure decrease.
b.
The volume and pressure increase.
c.
The volume increases but the pressure decreases.
d.
The volume decreases but the pressure increases.
30.The graph below shows the changes in lung capacity of a man.
What is the volume of air inspired by the man during a normal breath?
a.
0.5 dm3
b.
1.0 dm3
c.
1.5 dm3
d.
2.5 dm3