Free Homeostasis MCQs with Answers
698 Homeostasis MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Homeostasis maintains a stable internal environment through the kidney and urinary system, thermoregulation and excretion. The kidney topics include filtration, selective reabsorption, urine formation and water balance, while thermoregulation involves sweating, vasodilation, vasoconstriction and hormonal control; excretion is different from egestion, which removes undigested food.
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Read the Homeostasis notesFree MDCAT chapter notes with key terms698 questions · page 14 of 35
- A. Nephrostomes
- B. Nephridiopore
- C. Excretory pore
- D. All (A), (B) and (C)
Explanation: Earthworm is an ideal example of another type of tubular excretory system called as metanephridium.
Correct answer: Nephrostomes262. Liver Synthesizes:
- A. Non-essential aminoacids
- B. Plasma proteins
- C. Cholesterol
- D. All (A), (B) and (C)
Explanation: The liver is the central station of metabolism and consequently the body's central metabolic clearing house.
Correct answer: All (A), (B) and (C)- A. Urea
- B. Uric acid
- C. Ammonia
- D. Amine phosphate
Explanation: Urea is a nitrogen-containing compound with the chemical formula CO(NH2)2, commonly used as a fertilizer and in the synthesis of plastics…
Correct answer: Urea264. The liver is:
- A. Smallest internal organ
- B. Medium-sized internal organ
- C. Body's largest internal organ
- D. All options are incorrect
Explanation: The liver is the body's largest internal organ.
Correct answer: Body's largest internal organ- A. Protein, vitamins, and minerals
- B. Carbohydrate, fat, and protein
- C. Glucose, fructose, and sucrose
- D. Glucose, iron, and protein
Explanation: Carbohydrates provide energy, fats support cell structure and storage, and proteins are crucial for tissue repair and growth.
Correct answer: Carbohydrate, fat, and protein- A. Haem catabolism
- B. Globin catabolism
- C. Cholesterol catabolism
- D. Both (A) and (C)
Explanation: Haem is a component of hemoglobin, the molecule responsible for carrying oxygen in red blood cells.
Correct answer: Haem catabolism267. The nephron is:
- A. The site of urine storage
- B. The function unit of the kidney
- C. The site where ADH is produced
- D. Also called the "Bowman's capsule"
Explanation: The nephron is indeed the functional unit of the kidney. Each kidney contains thousands of nephrons, and they are responsible for…
Correct answer: The function unit of the kidney- A. Renal corpuscle
- B. Collecting duct
- C. Nephron loop
- D. Proximal convoluted tubule
Explanation: The collecting duct receives filtrate from multiple nephrons. It plays a crucial role in reabsorption of water and electrolytes…
Correct answer: Collecting duct- A. Sodium ions
- B. Uric acid
- C. Creatinine
- D. Glucose
Explanation: Glucose is not normally found in urine in significant amounts in healthy individuals.
Correct answer: Glucose- A. Parathormone
- B. Anti-diuretic
- C. Aldosterone
- D. Vasopressin
Explanation: Aldosterone is a hormone produced by the adrenal glands that primarily regulates the balance of sodium and potassium ions in the blood by…
Correct answer: Aldosterone- A. Kidneys
- B. Lungs
- C. Intestine
- D. Liver
Explanation: The conversion of ammonia into urea occurs primarily in the liver. This process is known as the urea cycle or the ornithine cycle.
Correct answer: Liver- A. Amination
- B. Excretion
- C. Deamination
- D. Egestion
Explanation: Deamination is the process by which an amino group (-NH2) is removed from an amino acid, typically resulting in the formation of ammonia…
Correct answer: Deamination- A. Reptiles
- B. Birds
- C. Insects
- D. All of these
Explanation: Uric acid is indeed the chief nitrogenous waste material in the excretory system of all these groups: reptiles, birds, and insects.
Correct answer: All of these- A. Cortex
- B. Medulla
- C. Pelvis
- D. Urethra
Explanation: Urethra is not a structure of the kidney. The urethra is part of the urinary system, but it is not located within the kidney.
Correct answer: Urethra- A. Cortex
- B. Medulla
- C. Pelvis
- D. Hilus
Explanation: In the mammalian kidney, the pyramids refer to the renal pyramids, which are cone-shaped tissue structures located within the renal…
Correct answer: Medulla- A. Million
- B. Billion
- C. Trillion
- D. Thousand
Explanation: A pair of kidneys consists of millions of functional units, nephrons.
Correct answer: Million- A. Absorption, sodium
- B. Diffusion, chlorine
- C. Absorption, water
- D. Diffusion, Ammonia
Explanation: ADH (antidiuretic hormone) increases absorption of water from the collecting duct.
Correct answer: Absorption, water- A. Henle's loop and PCT
- B. Henle's loop and DCT
- C. Henle's loop and collecting duct
- D. Henle's loop and vasa rectae
Explanation: Henle's loop and the vasa recta, which are specialized capillaries that run parallel to the loop of Henle, form counter-current systems.
Correct answer: Henle's loop and vasa rectae- A. Sebum
- B. Bile
- C. Sweat
- D. Both (A) and (B)
Explanation: Cholesterol is primarily excreted in bile. Bile, produced by the liver and stored in the gallbladder, contains cholesterol, which is then…
Correct answer: Bile- A. Bowman's capsule only
- B. Glomerulus only
- C. Bowman's capsule & Glomerulus
- D. Henle's loop and vasa rectae
Explanation: The Malpighian body consists of both Bowman's capsule and the glomerulus.
Correct answer: Bowman's capsule & Glomerulus