Physiology of Respiration
Reason (R): The amount of oxygen dissolved in water is much lower than the amount of oxygen in air.
Which of the following is correct?
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, but R is not the correct explanation of A.
C. A is true, but R is false.
D. A is false, but R is true.
What are the functions of labeled parts [1 and 2] in the diagram?
1- filtering of air, 2- maintaining shape of lungs
1- Exchange of gases 2- assists in inhalation and exhalation
1- storing gases, 2- exchange of gases
1- absorption of gases, 2- assists in cellular respiration
Match the following:
AB1.Hair and mucus in nostrilsa. assists in inhalation and exhalation2.Cartilage in tracheab. increase surface area of absorption3.Alveolic.prevents entry of foreign bodies4.Diaphragmd.prevents collapse of tracheal structure
1- c, 2 –d, 3- a , 4- b
1- d, 2 –c , 3- b , 4- a
1- b, 2 –d , 3- c , 4- a
1- c, 2 –d , 3- b , 4- a
What happens during gaseous exchange in the lungs?
Oxygen diffuses into the blood and carbon dioxide diffuses out of it.
Carbon dioxide diffuses into blood and oxygen diffuses into blood.
Oxygen only diffuses
None of the above
- The rib cage contracts
- The diaphragm becomes flattened
- The pressure of air inside the lungs is lowered
- Air moves from higher pressure to lower pressure
- High concentrations of CO2 in the alveoli and and that of oxygen in the blood.
- High concentration of CO2 in the alveoli.
- High concentrations of oxygen in the alveoli and that of CO2 in the blood.
- Low concentration of CO2 in the alveoli.
Lungs lie in the thoracic cavity separated by
The ability of diaphragm in breathing can be attributed to its …………………..
Sensitivity to respiratory gases
Breathing is controlled by a centre in the