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Give reasons for the following : (i) Alveoli in lungs are richly supplied with blood capillaries. (ii) Respiratory pigment in the blood takes up oxygen and not carbon dioxide. (iii) During anaerobic respiration, a 3-carbon molecule is formed as an end product instead of CO₂ in human beings.
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Name the movements that occur all along the gut in human digestive system. How do they help in digestion ?
Where is bile juice stored in human body ? List two roles of bile juice.
Give reasons for the following :
How are the alveoli designed to maximise the exchange of gases?
Compare the functioning of alveoli in the lungs and nephrons in the kidneys with respect to their structure and functioning.
