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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 is oxygen and carbon dioxide transported in human beings?
Compare the functioning of alveoli in the lungs and nephrons in the kidneys with respect to their structure and functioning.
