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 27 of 35
- A. Cortical
- B. Juxtamedullary
- C. Juxtacortical nephron
- D. Medullary
Explanation: Nephrons that are arranged along the cortex of the kidney are called "cortical nephrons." Cortical nephrons are one of the two main types…
Correct answer: Cortical- A. Conservation of water results in a large volume of diluted urine.
- B. Restricted water supply causes the body to conserve water.
- C. Release of ADH is restricted in the presence of hyper-osmotic body fluids.
- D. Reduction in reabsorption results in the production of a concentrated small volume of urine.
Explanation: When the body is faced with a restricted water supply, it triggers mechanisms to conserve water, primarily through the action of…
Correct answer: Restricted water supply causes the body to conserve water.- A. Million
- B. Billion
- C. Millions
- D. Billions
Explanation: Each kidney contains approximately 1 to 1.5 million nephrons, making the total for a pair of kidneys several million nephrons.
Correct answer: Millions- A. Excreting salt through their gills
- B. Periodically drinking small amounts of water
- C. Excreting a hypotonic urine
- D. Excreting wastes in the form of uric acid
Explanation: The correct answer is: Excreting a hypotonic urine. Freshwater bony fishes live in an environment where the water is less salty than their…
Correct answer: Excreting a hypotonic urine- A. Nephridia
- B. Malpighian tubules
- C. Human kidneys
- D. All of these
Explanation: The correct answer is Malpighian tubules. These are excretory systems found in insects that help in the removal of nitrogenous wastes in…
Correct answer: Malpighian tubules526. In humans, water is:
- A. Found in glomerular filtrate
- B. Reabsorbed from nephron
- C. All of these are correct
- D. In the urine
Explanation: All three individual statements are true: water is filtered into the glomerular filtrate, most of it is reabsorbed along the nephron, and…
Correct answer: All of these are correct- A. Thermoregulation
- B. Osmoregulation
- C. Homeostasis
- D. All of them
Explanation: The correct answer is Homeostasis. Homeostasis is the process by which the body regulates its internal environment to maintain stable…
Correct answer: Homeostasis- A. Calcium Oxalate Stones
- B. Struvite Stones
- C. Uric Acid Stones
- D. Cystine Stones
Explanation: The correct answer is Struvite Stones, which form as a result of urinary tract infections caused by certain bacteria that produce ammonia.
Correct answer: Struvite Stones- A. Collecting duct
- B. Glomerulus
- C. Loop of Henle
- D. Bowman's capsule
Explanation: The collecting duct is responsible for determining the final concentration of urine.
Correct answer: Collecting duct- A. Homeotherms
- B. Poikilotherms
- C. Warm-blooded
- D. None of these
Explanation: The correct answer is Poikilotherms. These animals cannot maintain a constant body temperature and are often referred to as 'cold-blooded'…
Correct answer: Poikilotherms- A. Hypertonic
- B. Hypotonic
- C. Isotonic
- D. None of them
Explanation: The solution described (0.9gm of NaCl in 100ml of water) equates to a 0.9% NaCl solution, which is hypotonic relative to physiological…
Correct answer: Hypotonic- A. Marine fish
- B. Freshwater fish
- C. Both
- D. None
Explanation: Freshwater fish do not drink water because they are surrounded by an environment where the water has lower salinity than their bodily…
Correct answer: Freshwater fish- A. Salt
- B. Ammonia
- C. Urea
- D. Water
Explanation: Marine fish live in a hypertonic environment, meaning the surrounding water has a higher salt concentration compared to their body fluids.
Correct answer: Water- A. All land animals
- B. Freshwater animals
- C. Insects
- D. Amphibians
Explanation: The correct answer is Option C: Insects. Insects excrete uric acid because it is a less toxic form of nitrogenous waste that requires…
Correct answer: Insects- A. Flame cells
- B. Malpighian tubules
- C. Metanephridia
- D. Nephridiophores
Explanation: The correct answer is Metanephridia. Earthworms possess metanephridia, which are tubular excretory structures that filter fluid from the…
Correct answer: Metanephridia- A. Loop of Henle
- B. Saliva
- C. Urine
- D. Sweat glands
Explanation: The correct answer is sweat glands. Sweat glands are essential for thermoregulation in mammals as they produce sweat, which evaporates…
Correct answer: Sweat glands- A. Glomerulus and Bowman's capsule
- B. Bowman's capsule and ciliated tubules
- C. Arterioles and collecting duct
- D. Ciliated tubules, lined with glandular cells
Explanation: The Malpighian body is an essential part of the nephron in the kidney, responsible for the initial filtration of blood.
Correct answer: Glomerulus and Bowman's capsule- A. CO2
- B. Water
- C. Urea
- D. Undigested food
Explanation: The correct answer is 'Undigested food'. Metabolic waste refers to substances produced as a byproduct of metabolic processes within cells.
Correct answer: Undigested food- A. Highly
- B. Less
- C. Least
- D. Insoluble
Explanation: Uric acid is the least soluble in water among nitrogenous wastes, which is an adaptation for organisms that need to conserve water, such…
Correct answer: Least- A. Uric acid
- B. Urea
- C. Both
- D. None
Explanation: Urea is a waste product formed in the liver through the urea cycle. It is much less toxic than ammonia, which is why it can safely…
Correct answer: Urea