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 16 of 35
- A. 25°C to 35°C
- B. 30°C to 40°C
- C. 36°C to 43°C
- D. 36°C to 38°C
Explanation: Mammals including human maintain their high body temperature within a narrow range of about 36-38°C because of their endothermic…
Correct answer: 36°C to 38°C- A. 25°C to 35°C
- B. 30°C to 40°C
- C. 41°C to 43°C
- D. 36°C to 38°C
Explanation: Birds are endothermic animals, meaning they generate their own body heat internally.
Correct answer: 41°C to 43°C- A. Vaso-dilation
- B. Lowering the hairs
- C. Reduction in sub-cutaneous fat
- D. All (A), (B) and (C)
Explanation: When the environmental temperature is high, homotherms regulate their body temperature by vasodilation, which involves the widening of…
Correct answer: All (A), (B) and (C)- A. Vaso-constriction
- B. Erection of hairs
- C. Increase in sub-cutaneous fat
- D. All (A), (B) and (C)
Explanation: Blood vessels near the skin's surface constrict, reducing blood flow to the skin and minimizing heat loss to the environment.
Correct answer: All (A), (B) and (C)- A. Pyrenins
- B. Pyridoxins
- C. Pyrogens
- D. All (A), (B) and (C)
Explanation: Pyrogens are substances that cause fever by acting on the hypothalamus to raise the body's temperature set point.
Correct answer: Pyrogens- A. Homeothermic
- B. Poikilothermic
- C. Ectothermic
- D. None of these
Explanation: Homeothermic animals are able to maintain a relatively constant body temperature regardless of external temperature fluctuations.
Correct answer: Homeothermic- A. Ornithine cycle
- B. Urea cycle
- C. Urine cycle
- D. Both (A) and (B)
Explanation: The cycle depicted in the diagram is the Urea Cycle. Also known as the ornithine cycle or the Krebs-Henseleit cycle, it is a series of…
Correct answer: Both (A) and (B)- A. Hemodialysis
- B. Peritoneal dialysis
- C. Lithotripsy
- D. Kidney transplantation
Explanation: Option D is correct.The most effective and definitive treatment for end-stage renal failure is kidney transplantation.
Correct answer: Kidney transplantation- A. Ammonia
- B. Arginine
- C. Ornithine
- D. Urea
- E. Uric acid
Explanation: Deamination is the removal of an amino group from a molecule. Enzymes that catalyze this reaction are called deaminases.
Correct answer: Ammonia- A. Cockroach
- B. Earthworm
- C. Human
- D. Planaria
- E. Hydra
Explanation: The correct answer is cockroach, as they possess Malpighian tubules for excretion.
Correct answer: Cockroach311. The disease in which patients passed urine that rapidly turned black on exposure to air is called:
- A. Phenylketonuria
- B. Alkaptonuria
- C. Sickle cell anemia
- D. Hemophilia
- E. Anuria
Explanation: Alkaptonuria is an inherited condition that results in the buildup of homogentisic acid, causing urine to turn black upon exposure to air.
Correct answer: Alkaptonuria- A. ADH
- B. Parathormone
- C. Aldosterone
- D. Estrogen
- E. Thyroxin
Explanation: Aldosterone is a steroid hormone. Its main role is to regulate salt (which contains Sodium chloride mainly) in the body, thus having an…
Correct answer: Aldosterone- A. Collecting duct .... By active secretion
- B. Distal convoluted tubule .... By passive diffusion
- C. Glomerulus .... By selective reabsorption
- D. Glomerulus .... By ultrafiltration
- E. Proximal convoluted tubule .... By active reabsorption
Explanation: All the nutrients, including glucose, are absorbed back into the proximal convoluted tubule by active reabsorption.
Correct answer: Proximal convoluted tubule .... By active reabsorption- A. Vasoconstriction
- B. Vasodilation
- C. Shivering
- D. Raising body hairs
Explanation: If the surrounding temp is higher than normal then the body will want to lose heat and hence Vasodilation will occur so that more blood…
Correct answer: Vasodilation- A. Coordination
- B. Organisation
- C. Homeostasis
- D. Integration
Explanation: Homeostasis is the correct answer because it refers to the active regulation of an organism's internal conditions to maintain stability…
Correct answer: Homeostasis- A. Reptiles
- B. Amphibians
- C. Birds
- D. Fishes
Explanation: Homeothermy is the phenomenon of thermoregulation to maintain a stable internal body temperature regardless of external environment.
Correct answer: Birds- A. Mesophytes
- B. Xerophytes
- C. Halophytes
- D. Hydrophytes
Explanation: Sunken stomata are typically found in xerophytes, which are plants adapted to survive in dry, arid environments with limited water…
Correct answer: Xerophytes- A. Cuboidal epithelium
- B. Squamous epithelium
- C. Columnar epithelium
- D. Ciliated epithelium
Explanation: Squamous epithelium is a type of tissue composed of flat, scale-like cells.
Correct answer: Squamous epithelium- A. Urethra
- B. Pelvis
- C. Ureter
- D. Nephron
Explanation: From the calyxes, urine travels out of the kidneys through the 'ureters' to be stored in the bladder (a muscular sac in the lower belly).
Correct answer: Ureter- A. Osmoconformers
- B. Osmoregulators
- C. Isotonic to environment
- D. At dynamic equilibrium with environment
Explanation: Osmoregulation is the active regulation of the osmotic pressure of an organism's body fluids, detected by osmoreceptors, to maintain the…
Correct answer: Osmoregulators