Which statement best reflects the composition of atmospheric air at sea level?
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%
Identify the correct sequence of the organs of the respiratory passageway.
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
Which statement reflects the four major processes involved in respiration?
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.
Tidal volume is;
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
Gas exchange between pulmonary capillaries and pulmonary alveoli occurs as a result of
osmosis
diffusion
active transport
breathing
Diffusion of gases is the transfer of molecules;
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
Internal respiration is;
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
The level of carbon dioxide in the blood is initially detected by
chemoreceptors in the aortic and carotid bodies
stretch receptors in the lungs
the pons centre
inspiratory centre in the brain
The most powerful stimulant that increases the rate and depth of respiration in a healthy person is;
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
Which statement best describes the transport of oxygen and carbon dioxide in the blood?
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
