🧬 KSSM · Form 4 · Age 16

Homeostasis and Urinary System

58 exam-format practice questions · Biology, Form 4 · Free to start

Lesson overview

This lesson focuses on maintaining internal balance through the urinary system. Students will learn to identify key structures including the nephron, glomerulus, Bowman’s capsule, proximal convoluted tubule, loop of Henle, and collecting duct. The syllabus requires understanding ultrafiltration under high pressure in the glomerulus and selective reabsorption of useful substances like glucose and amino acids back into the blood. You will also study how ADH regulates water permeability in the collecting ducts based on body hydration levels. These concepts explain how the kidneys filter waste while preserving essential nutrients and fluid balance for homeostasis. Many students confuse filtration with active transport or mix up the functions of different nephron parts. A common error is failing to link low water intake directly to increased ADH secretion and concentrated urine production. Mastering these mechanisms helps you answer complex exam questions about hormonal control and kidney failure accurately. It builds a strong foundation for understanding other homeostatic processes like thermoregulation and blood glucose regulation. By clarifying these specific physiological pathways, you can confidently tackle diagram-based questions and explain the step-by-step formation of urine without losing marks on technical terminology or causal relationships.

Try these questions

Q1. Which of the following correctly describes the effect of antidiuretic hormone (ADH) on the collecting duct?

A.Increases permeability to water, leading to more concentrated urine

B.Decreases permeability to water, leading to more dilute urine

C.Increases reabsorption of sodium ions, leading to water retention

D.Inhibits reabsorption of urea, leading to increased urine volume

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Q2. During a hot day, a person sweats heavily but drinks little water. Which hormonal response is expected to maintain homeostasis?

A.Increased secretion of ADH and aldosterone

B.Decreased secretion of ADH and increased secretion of aldosterone

C.Increased secretion of ADH and decreased secretion of aldosterone

D.Decreased secretion of both ADH and aldosterone

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Q3. Which of the following is the primary function of the loop of Henle in the nephron?

A.Filtration of blood plasma

B.Reabsorption of glucose and amino acids

C.Creation of a concentration gradient in the medulla

D.Secretion of hydrogen ions into the urine

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