Write one specific function each of the following organs in relation with excretion in human beings :
(i) Renal Artery
(ii) Urethra
(iii) Glomerulus
(iv) Tubular part of nephron Tubular part of nephron
Generated by claude-sonnet-4-6 · 2026-06-11 09:50 · grounding rag
Model Answer
(i) Renal Artery: It supplies oxygenated blood (containing nitrogenous wastes) to the kidneys for filtration.
(ii) Urethra: It carries urine from the urinary bladder to the outside of the body for elimination.
(iii) Glomerulus: It is a cluster of thin-walled capillaries where filtration of blood takes place — waste products and other substances are filtered out of the blood into the Bowman's capsule.
(iv) Tubular part of nephron: It selectively reabsorbs useful substances such as glucose, amino acids, salts and a major amount of water from the filtrate back into the blood.
Source: Life Processes, Chapter 5, Section 5.5.1
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Explanation
- These are standard 1-mark-each parts; one clear function per organ is enough — no elaboration needed.
- Examiners look for key terms: filtration (glomerulus), reabsorption (tubule), elimination/passage of urine (urethra), supply of blood for filtration (renal artery).
- Do not confuse ureter (carries urine from kidney to bladder) with urethra (bladder to outside).
- The tubular reabsorption point is directly stated in the textbook: "glucose, amino acids, salts and a major amount of water are selectively re-absorbed."