Life Processes
Exchange of gases in the body takes place by which of the following mechanisms?
Osmosis
Diffusion
Active transport
Counter-current exchange
Diffusion
Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. The exchange of gases take place in the millions of alveoli in the lungs and the capillaries that envelop them. Due to the difference in concentration, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.
Diffusion Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. The exchange of gases take place in the millions of alveoli in the lungs and the capillaries that envelop them. Due to the difference in concentration, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.
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The process of obtaining food to meet the energy demands of the body is known as:A. excretion
B. respiration
C. nutrition
D. circulation
The process involving oxidation of food to release energy is known as _________ .
A. breathing
B. excretion
C. circulation
D. respiration
What is the function of the sac-like structures present at the end of bronchioles?
A. Storage of respiratory gases
B. Exchange of respiratory gases
C. Protection of lungs
D. Protection from bacteria
Exchange of gases in alveoli occurs through:
A. absorption
B. dialysis
C. diffusion
D. anaerobic respiration
The process of digestion of food starts in the:
A. mouth
B. stomach
C. small intestine
D. oesophagus
The smallest blood vessel of the circulatory system is known as the:
A. artery
B. vein
C. capillary
D. aorta
Where does digestion of proteins take place?
A. Stomach only
B. Stomach and small intestines
C. Stomach and large intestines
D. Large intestines only
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