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MDCAT 2025 Biology Homeostasis Test Online Mcqs

Malik TahirLast Updated: July 11, 2025

MDCAT Biology Homeostasis Test

Prepare for MDCAT 2025 Biology with this Homeostasis MCQ test, based on the official PMDC syllabus. Practice key concepts like osmoregulation, thermoregulation, and excretion with chapter-wise questions to strengthen your exam preparation.

Online Biology Homeostasis Test

Total Questions:	50
Time Allowed:	25 Minutes
Total Marks:	50
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	MDCAT Entry Test Biology Online Test Interview Questions about Biology All Universities Entrance Test Recruitments Tests

Homeostasis Online Test Question with Answer

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1. What is the primary function of tubular secretion?

Reabsorbing proteins

Eliminating additional wastes like H+ and drugs

Adding more water

Removing glucose

2. What stimulates ADH release?

Low heart rate

High water intake

High blood pressure

Low blood volume or high plasma osmolarity

3. Which response occurs when body temperature rises too high?

Pupil dilation

Sweating

Vasoconstriction

Shivering

4. What does dialysis do?

Filters food in the stomach

Improves digestion

Replaces kidney function by filtering blood

Produces bile

5. What causes the pain experienced during kidney stones?

Acid reflux

Crystals moving through narrow ureters

Gas formation

Infection of the bladder

6. What is the primary nitrogenous waste in humans?

Ammonia

Urea

Creatinine

Uric acid

7. Which is a method used by the body to conserve heat?

Sweating

Vasoconstriction

Increased breathing

Urination

8. Which of these would be abnormal in urine?

Water

Urea

Sodium

Glucose

9. What is the role of the vasa recta?

Maintain salt gradient in medulla

Filter blood

Store waste

Carry oxygen to the kidney

10. Which of the following causes kidney stones?

Crystal formation of salts like calcium oxalate

Excessive fat

Low blood pressure

Vitamin C deficiency

11. What leads to the formation of kidney stones?

Acid reflux

High vitamin D

Dehydration

Cold temperature

12. Which organ is responsible for converting ammonia into urea?

Kidney

Liver

Spleen

Pancreas

13. What does the presence of proteins in urine usually indicate?

Normal kidney function

Diabetes

Dehydration

Kidney damage or disease

14. Which part of the nephron dips into the medulla of the kidney?

Proximal tubule

Distal tubule

Collecting duct

Loop of Henle

15. Why is the medulla of the kidney important?

It produces bile

It stores glucose

It concentrates urine

It filters blood

16. What is the function of glomerular capillaries?

Reabsorb nutrients

Store waste

Secrete hormones

Perform filtration

17. Which of the following is a nitrogenous waste product excreted in urine?

Glucose

Oxygen

Urea

Bicarbonate

18. Which hormone increases urine concentration by retaining water?

Insulin

ADH

Glucagon

Thyroxine

19. What is the main purpose of homeostasis?

Increasing metabolism

Controlling external temperature

Maintaining internal stability

Enhancing digestion

20. Which part of the brain controls thermoregulation?

Medulla

Cerebrum

Cerebellum

Hypothalamus

21. Which capillary bed is involved in the filtration process?

Peritubular capillaries

Glomerular capillaries

Alveolar capillaries

Vasa recta

22. What do peritubular capillaries primarily do?

Absorb oxygen

Reabsorb water and nutrients

Filter blood

Produce urine

23. What is the function of the distal convoluted tubule?

Regulate pH and ion balance

Filter blood

Absorb nutrients

Concentrate bile

24. Which of the following describes the kidney’s role in osmoregulation?

Filters pathogens

Regulates blood pressure

Balances water and salt levels

Produces bile

25. Which of the following substances is actively secreted into the nephron?

Glucose

Sodium

Water

Hydrogen ions

Page 2 of 2

26. Which condition is caused by accumulation of urea in the blood?

Anemia

Hyperglycemia

Uremia

Hypertension

27. Which component is most abundant in normal urine?

Glucose

Red blood cells

Protein

Water

28. How is kidney failure commonly treated?

Antibiotics

Dialysis or kidney transplant

Vaccination

Chemotherapy

29. Which of the following can result from long-term kidney failure?

High oxygen levels

Increased urination

Bone demineralization

Faster digestion

30. Which of the following is a common symptom of kidney failure?

Frequent sneezing

Swelling due to fluid retention

Increased lung function

Sweating

31. Which hormone helps in water reabsorption in kidneys?

Glucagon

Estrogen

ADH

Insulin

32. Which of the following is NOT a nitrogenous waste?

Ammonia

Creatinine

Glucose

Urea

33. Which process removes drugs and toxins from the blood?

Peristalsis

Tubular secretion

Glomerular filtration

Selective reabsorption

34. What structure in the kidney performs glomerular filtration?

Ureter

Loop of Henle

Glomerulus

Collecting duct

35. What is the function of the ureter?

Filter blood

Store urine

Reabsorb water

Transport urine from kidney to bladder

36. What is thermoregulation?

Regulation of blood sugar

Production of hormones

Maintenance of internal body temperature

Blood pressure control

37. Which structure collects the final urine from nephrons?

Collecting duct

Distal tubule

Loop of Henle

Ureter

38. Which structure in the nephron collects the filtrate after glomerular filtration?

Collecting duct

Proximal tubule

Bowman's capsule

Loop of Henle

39. Which nitrogenous compound is the most toxic?

Ammonia

Uric acid

Creatinine

Urea

40. Which of the following increases the risk of kidney stones?

Excess vitamin C

Low salt diet

High fiber intake

Dehydration and high protein intake

41. Which of the following substances is reabsorbed during selective reabsorption?

Urea

Creatinine

Ammonia

Glucose

42. Which of the following helps maintain acid-base balance in the blood?

ADH

Vasoconstriction

Tubular secretion

Glomerular filtration

43. What structure delivers blood to the glomerulus?

Afferent arteriole

Efferent arteriole

Renal vein

Peritubular capillary

44. Which condition may result from prolonged kidney failure?

Jaundice

Hyperthyroidism

Asthma

Anemia

45. What is the function of the renal pelvis?

Produces urine

Stores urine

Filters blood

Transports urine to the ureter

46. What is the function of the loop of Henle?

Blood filtration

Hormone production

Glucose digestion

Reabsorption of water and salts

47. Which capillary bed surrounds the renal tubule and assists in reabsorption?

Peritubular capillaries

Coronary capillaries

Glomerular capillaries

Pulmonary capillaries

48. Which compound is least likely to be found in normal urine?

Water

Sodium

Glucose

Urea

49. Which part of the nephron plays a major role in selective reabsorption?

Proximal convoluted tubule

Bowman's capsule

Collecting duct

Loop of Henle

50. Which of the following processes occurs first in urine formation?

Glomerular filtration

Selective reabsorption

Osmoregulation

Tubular secretion

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Malik TahirLast Updated: July 11, 2025

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19 Comments

Rabia says:

August 11, 2022 at 8:22 pm

I got 24 /25

Rabia says:

August 11, 2022 at 8:22 pm

I got 24 out of 25

Ali Ahmed says:

January 12, 2022 at 2:35 pm

I want study in kips

FATIMA KHAN says:

December 19, 2021 at 1:17 pm

These questions are taken from punjab textbook board??

Alina Qazi says:

October 8, 2021 at 3:12 pm

What is face back mechanism?
Please tell the book where there’s written about face back mechanism?

Sajjad Baloch says:

September 13, 2021 at 9:13 am

Best efforts dear

Sanan farzand says:

August 1, 2021 at 1:20 pm

Good thing

Alimardan says:

February 27, 2021 at 9:47 pm

PRE medical

Abdullah munir says:

October 18, 2020 at 7:10 pm

no preparation, Fsc student and 80% marks i am such a dumb student :<

tanya amir says:

September 20, 2020 at 8:34 pm

i got 92 without even reading the chapter

AbuHuraira says:

August 21, 2020 at 1:27 pm

Allah Tera Shukar ha

zafar mirza says:

July 3, 2020 at 5:35 pm

wow it really a good website for all of us for preperation
i got 96 percent

Syeda Shereen Gardazi says:

July 15, 2017 at 11:12 am

Waoooo i got 96% , its really a good way to learn , .

1. Asad says:
  
  October 22, 2018 at 2:22 pm
  
  waah nice
  
  1. AbuHuraira says:
    
    August 21, 2020 at 1:26 pm
    
    Allah tera Shukar ha
    
Nayaab says:

March 10, 2017 at 3:14 pm

100% Unbeatable.!!!Not too surprising as I always get Lol :p
Guys do your best for the mcat and Allah will do the rest 🙂 Best of luck to all <3

shabir ahmed says:

May 26, 2016 at 4:15 pm

it was my frst time to,,, no preparation

1. Ahmar says:
  
  July 16, 2020 at 11:57 pm
  
  same bruh.Everyone bragging off about their scores lol
  
Hamza jutt says:

April 19, 2016 at 10:25 pm

Yo got 92% thanks gotest

MDCAT 2025 Biology Homeostasis Test Online Mcqs

MDCAT Biology Homeostasis Test

Online Biology Homeostasis Test

Homeostasis Online Test Question with Answer

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Malik Tahir

19 Comments

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MDCAT Biology Homeostasis Test

Online Biology Homeostasis Test

Homeostasis Online Test Question with Answer

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Malik Tahir

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