Excretion and Osmoregulation — Flashcards
Maharashtra Board · Class 11 · Biology
20 flashcards for Excretion and Osmoregulation (Maharashtra Board Class 11 Biology) to test yourself on key terms and facts.
Interactive on Super Tutor
Studying Excretion and Osmoregulation? Get the full interactive chapter.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for flashcards and more.
Free trial, no card needed.
What is excretion and how does it differ from digestive waste elimination?
Answer
Excretion is the elimination of metabolic waste products from the body. Unlike digestive wastes (unabsorbed/undigested substances that never entered cells), metabolic wastes are produced inside body c…
Compare ammonotelism, ureotelism, and uricotelism in terms of toxicity, water requirement, and energy cost.
Answer
Ammonotelism: Highly toxic, requires 300-500ml water per gram, energy-efficient, found in aquatic animals. Ureotelism: Less toxic, requires ~50ml water per gram, moderate energy cost (3 ATP per urea),…
What is the structural and functional unit of the kidney? Describe its main components.
Answer
Nephron is the structural and functional unit of the kidney. Each nephron consists of: Bowman's capsule (cup-shaped structure containing glomerulus), Proximal Convoluted Tubule (PCT), Loop of Henle (U…
Explain the three steps of urine formation with their specific locations and functions.
Answer
1. Ultrafiltration (Glomerulus): High pressure (55 mmHg) forces plasma through capillary walls, forming glomerular filtrate (180L/day). 2. Selective Reabsorption (PCT & DCT): 99% of filtrate reabsorbe…
What is the countercurrent mechanism and how does it help in concentrating urine?
Answer
Countercurrent mechanism operates in Loop of Henle and vasa recta to concentrate urine up to 1200 mOsm/L. Descending limb is water-permeable, loses water making filtrate concentrated. Ascending limb i…
Define osmoregulation and distinguish between osmoconformers and osmoregulators.
Answer
Osmoregulation is the process of controlling solute concentrations and water balance to maintain constant internal environment (homeostasis). Osmoconformers: Body fluids are isoosmotic with surroundin…
How does ADH (Antidiuretic Hormone) regulate water balance in the body?
Answer
ADH is released by posterior pituitary when osmoreceptors in hypothalamus detect increased blood osmolarity. ADH increases permeability of DCT and collecting duct cells to water, promoting water reabs…
What is the RAAS system and what are the three main functions of Angiotensin II?
Answer
RAAS (Renin-Angiotensin-Aldosterone System) is activated when blood pressure/volume decreases. JGA cells release renin → converts angiotensinogen to Angiotensin I → converted to Angiotensin II. Functi…
+12 more flashcards
Practise AllFrequently Asked Questions
What are the important topics in Excretion and Osmoregulation for Maharashtra Board Class 11 Biology?
How many flashcards are available for Excretion and Osmoregulation?
How should I revise Excretion and Osmoregulation for Class 11 exams?
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
More resources for Excretion and Osmoregulation
For serious students
Get the full Excretion and Osmoregulation chapter — start free.
Quizzes, flashcards, an AI doubt solver and a study plan for Maharashtra Board Class 11 Biology. Free to start, no card needed.