EXCRETORY SYSTEM
EXCRETORY SYSTEM ALL QUESTIONS
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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water, some salts, and blood
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water, some salts, and urea
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Either A or B
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None of the above
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Detailed explanation-1: -Human urine is composed primarily of water (95%). The rest is urea (2%), creatinine (0.1%), uric acid (0.03%), chloride, sodium, potassium, sulphate, ammonium, phosphate and other ions and molecules in lesser amounts30 (Table 1).
Detailed explanation-2: -It consists of water, urea (from amino acid metabolism), inorganic salts, creatinine, ammonia, and pigmented products of blood breakdown, one of which (urochrome) gives urine its typically yellowish colour.
Detailed explanation-3: -The process of excretion is called urination and it is excreted through the urethra. Urine primarily consists of water (95%), including organic solute like urea (2.5%), and other wastes (2.5%) such as enzymes, hormones, fatty acids etc. Hence the statement is incorrect.
Detailed explanation-4: -About 91–96% of urine consists of water. The remainder can be broadly characterized into inorganic salts, urea, organic compounds, and organic ammonium salts. Urine also contains proteins, hormones, and a wide range of metabolites, varying by what is introduced into the body.