Respiratory system

Question 1 of 10

1

Which statement best reflects the composition of atmospheric air at sea level?

Select one of the following:

oxygen 21%, carbon dioxide 0.04%, nitrogen 78%
oxygen 18%, carbon dioxide 0.01%, nitrogen 81%
oxygen 15%, carbon dioxide 0.04%, nitrogen 85%
oxygen 24%, carbon dioxide 0.01%, nitrogen 76%

Explanation

Question 2 of 10

1

Identify the correct sequence of the organs of the respiratory passageway.

Select one of the following:

nasal cavity, larynx, pharynx, trachea, bronchus, bronchioles
nasal cavity, pharynx, larynx, trachea, bronchus, bronchioles
nasal cavity, pharynx, larynx, bronchus, trachea, bronchioles
nasal cavity, larynx, pharynx, trachea, bronchus, alveolus, bronchioles

Explanation

Question 3 of 10

1

Which statement reflects the four major processes involved in respiration?

Select one of the following:

inspiration, expiration, pulmonary ventilation, transport of respiratory gases
pulmonary ventilation, inspiration, external respiration, expiration
pulmonary ventilation, external respiration, transport of respiratory gases, internal respiration
inspiration, expiration, external respiration, transport of respiratory gases.

Explanation

Question 4 of 10

1

Tidal volume is;

Select one of the following:

the amount of exchangable air
the amount of air that can still be exhaled (forcibly) after a normal exhalation
respiratory volume inhaled and exhaled during normal breathing
air in respiratory passages that does not contribute to gas exchange

Explanation

Question 5 of 10

1

Gas exchange between pulmonary capillaries and pulmonary alveoli occurs as a result of

Select one of the following:

osmosis
diffusion
active transport
breathing

Explanation

Question 6 of 10

1

Diffusion of gases is the transfer of molecules;

Select one of the following:

from an area of high concentration to an area of low concentration
from an area of low concentration to an area of high concentration
from an area of high concentration to an area of low concentration that requires cellular energy
from an area of low concentration to an area of high concentration that requires cellular energy

Explanation

Question 7 of 10

1

Internal respiration is;

Select one of the following:

the process of breathing in and out
gas exchange between the pulmonary alveoli and pulmonary capillaries
gas exchange between tissue capillaries and tissue cells
gas exchange in the nasal passages

Explanation

Question 8 of 10

1

The level of carbon dioxide in the blood is initially detected by

Select one of the following:

chemoreceptors in the aortic and carotid bodies
stretch receptors in the lungs
the pons centre
inspiratory centre in the brain

Explanation

Question 9 of 10

1

The most powerful stimulant that increases the rate and depth of respiration in a healthy person is;

Select one of the following:

the rising level of oxygen and carbon dioxide in the blood
the rising level of carbon dioxide in the blood
the rising level of oxygen in the blood
the low levels of oxygen in the blood

Explanation

Question 10 of 10

1

Which statement best describes the transport of oxygen and carbon dioxide in the blood?

Select one of the following:

oxygen, attached to haemoglobin, is transported to the cells and most of the carbon dioxide is carried in plasma as bicarbonate ions, from the cells.
oxygen, attached to haemoglobin is transported from cells and most carbon dioxide is carried in plasma as bicarbonate ions to the cells
the majority of oxygen and carbon dioxide are carried in plasma, oxygen to the cells and carbon dioxide from the cells
the majority of oxygen and carbon dioxide is carried by haemoglobin, carbon dioxide to the cells and oxygen away from the cells

	Created by o any over 7 years ago