Physiology MCQs 50 Score: 0 Attempted: 0/50 Subscribe 1. What is the normal pH of blood in most domestic animals? (A) 6.8 (B) 7.0 (C) 7.4 (D) 7.8 2. Which organ is primarily responsible for detoxification in animals? (A) Kidney (B) Liver (C) Lungs (D) Spleen 3. Which hormone regulates blood calcium levels by increasing calcium absorption? (A) Calcitonin (B) Parathyroid hormone (C) Insulin (D) Glucagon 4. The pacemaker of the heart is: (A) AV node (B) SA node (C) Purkinje fibers (D) Bundle of His 5. Which type of muscle is under voluntary control? (A) Cardiac muscle (B) Skeletal muscle (C) Smooth muscle (D) Visceral muscle 6. Hemoglobin primarily binds with: (A) Carbon dioxide (B) Oxygen (C) Nitrogen (D) Hydrogen 7. What is the primary function of the nephron? (A) Blood filtration (B) Hormone secretion (C) Enzyme production (D) Nutrient absorption 8. Which hormone is secreted by the pancreas to lower blood glucose? (A) Glucagon (B) Insulin (C) Cortisol (D) Epinephrine 9. Which vitamin is essential for normal blood clotting? (A) Vitamin A (B) Vitamin D (C) Vitamin K (D) Vitamin E 10. The normal body temperature of cattle is approximately: (A) 36°C (B) 37.5°C (C) 38.5°C (D) 40°C 11. The functional unit of the liver is called: (A) Nephron (B) Alveolus (C) Lobule (D) Acinus 12. Which electrolyte is most abundant in intracellular fluid? (A) Sodium (B) Potassium (C) Calcium (D) Chloride 13. The hormone responsible for milk letdown is: (A) Prolactin (B) Oxytocin (C) Progesterone (D) Estrogen 14. The primary site of gas exchange in the lungs is: (A) Bronchi (B) Bronchioles (C) Alveoli (D) Trachea 15. What is the main pacemaker potential property of SA node cells? (A) Depolarization (B) Automaticity (C) Excitability (D) Contractility 16. Which hormone is known as the “fight or flight” hormone? (A) Insulin (B) Cortisol (C) Epinephrine (D) Thyroxine 17. The Bohr effect is related to: (A) Hemoglobin’s oxygen affinity (B) Cardiac output (C) Renal filtration (D) Acid-base buffering 18. The functional unit of the nervous system is: (A) Astrocyte (B) Neuron (C) Synapse (D) Axon 19. The refractory period in muscle physiology prevents: (A) Fatigue (B) Overcontraction (C) Tetany (D) Reverse contraction 20. Which hormone stimulates red blood cell production? (A) Cortisol (B) Erythropoietin (C) Aldosterone (D) Growth hormone 21. The largest volume of water in the body is found in: (A) Extracellular fluid (B) Plasma (C) Intracellular fluid (D) Lymph 22. The normal heart rate of a resting adult horse is: (A) 20–30 bpm (B) 28–44 bpm (C) 50–70 bpm (D) 70–100 bpm 23. The function of surfactant in the lungs is to: (A) Transport oxygen (B) Prevent alveolar collapse (C) Increase mucus secretion (D) Stimulate ciliary movement 24. Which ion is essential for muscle contraction? (A) Sodium (B) Calcium (C) Potassium (D) Chloride 25. The major site for nutrient absorption is: (A) Stomach (B) Large intestine (C) Small intestine (D) Esophagus 26. The normal gestation period of a cow is approximately: (A) 250 days (B) 280 days (C) 300 days (D) 320 days 27. Which part of the brain regulates body temperature? (A) Cerebrum (B) Cerebellum (C) Hypothalamus (D) Medulla 28. Which hormone maintains pregnancy in mammals? (A) Estrogen (B) Progesterone (C) Relaxin (D) LH 29. The main buffer system in blood is: (A) Phosphate buffer (B) Hemoglobin buffer (C) Bicarbonate buffer (D) Protein buffer 30. Which structure prevents food from entering the trachea during swallowing? (A) Uvula (B) Epiglottis (C) Soft palate (D) Vocal cords 31. The normal heart rate of cattle is: (A) 40–60 bpm (B) 60–80 bpm (C) 80–100 bpm (D) 100–120 bpm 32. Which organ produces bile? (A) Pancreas (B) Liver (C) Gall bladder (D) Duodenum 33. The resting membrane potential of most animal cells is about: (A) –30 mV (B) –50 mV (C) –70 mV (D) –100 mV 34. What is the primary respiratory gas that stimulates breathing? (A) Oxygen (B) Carbon dioxide (C) Nitrogen (D) Hydrogen 35. The normal respiratory rate of a resting adult sheep is: (A) 10–15 breaths/min (B) 16–24 breaths/min (C) 25–30 breaths/min (D) 30–40 breaths/min 36. Which enzyme initiates protein digestion in the stomach? (A) Amylase (B) Trypsin (C) Pepsin (D) Lipase 37. The hormone responsible for water reabsorption in kidneys is: (A) Aldosterone (B) Vasopressin (ADH) (C) Cortisol (D) Renin 38. Which part of the brain controls balance and coordination? (A) Cerebrum (B) Cerebellum (C) Pons (D) Medulla 39. The primary pacemaker current in the heart is carried by: (A) Sodium (B) Potassium (C) Calcium (D) Chloride 40. Which blood component is responsible for immunity? (A) Platelets (B) Plasma (C) Red blood cells (D) White blood cells 41. The functional unit of skeletal muscle is: (A) Myofibril (B) Sarcomere (C) Myosin filament (D) Actin filament 42. Which vitamin is essential for calcium absorption? (A) Vitamin A (B) Vitamin C (C) Vitamin D (D) Vitamin K 43. Which heart sound is produced by closure of the AV valves? (A) First heart sound (S1) (B) Second heart sound (S2) (C) Third heart sound (S3) (D) Fourth heart sound (S4) 44. The normal blood pressure of a dog is approximately: (A) 80/40 mmHg (B) 100/60 mmHg (C) 120/80 mmHg (D) 140/90 mmHg 45. Which hormone stimulates milk production? (A) Estrogen (B) Progesterone (C) Oxytocin (D) Prolactin 46. The primary energy currency of the cell is: (A) GTP (B) ATP (C) NADH (D) FADH2 47. Which type of respiration occurs in the absence of oxygen? (A) Aerobic (B) Anaerobic (C) External (D) Internal 48. The primary pacemaker of the gastrointestinal tract is: (A) Myenteric plexus (B) Submucosal plexus (C) Interstitial cells of Cajal (D) Vagus nerve 49. Which hormone is secreted in response to low blood pressure? (A) Insulin (B) Glucagon (C) Aldosterone (D) Thyroxine 50. The normal respiratory rate of cattle is: (A) 10–15 breaths/min (B) 16–24 breaths/min (C) 26–30 breaths/min (D) 30–40 breaths/min Basic & Pre-Clinical Subjects (MCQs) Anatomy MCQs Histology MCQs Physiology MCQs Biochemistry MCQs Animal Genetics & Breeding MCQs Livestock Production & Management MCQs Animal Nutrition MCQs Veterinary Microbiology MCQs Veterinary Parasitology MCQs Veterinary Pathology MCQs Clinical Sciences (MCQs) Veterinary Medicine MCQs Veterinary Surgery & Radiology MCQs Veterinary Gynaecology & Obstetrics MCQs Veterinary Pharmacology & Toxicology MCQ s Veterinary Anaesthesiology MCQs Veterinary Clinical Pathology MCQs Preventive & Public Health (MCQs) Veterinary Epidemiology MCQs Veterinary Public Health MCQs Veterinary Preventive Medicine MCQs Veterinary Ethics & Jurisprudence MCQs Specialized & Allied Subjects (MCQs) Poultry Science MCQs Aquatic Animal Health MCQs Wildlife Health & Management MCQs Veterinary Biotechnology MCQs Veterinary Extension Education MCQs Veterinary Economics & Business Management MCQs