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Why is respiratory pigment needed in multicellular organisms with large body size ?
Give reasons for the following :
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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.
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.