NEET Biology Practice Questions - Set 5

41. Which of the following guards the opening of hepatopancreatic duct into the duodenum?

A. Pyloric sphincter B. Sphincter of Oddi C. Semilunar valve D. Ileocaecal valve

42. The enzyme enterokinase helps in conversion of:

A. Protein into polypeptides B. Trypsinogen into trypsin C. Caseinogen into casein D. Pepsinogen into pepsin

43. Tidal Volume and Expiratory Reserve Volume of an athlete is 500 mL and 1000 mL respectively. What will be his Expiratory Capacity if the Residual Volume is 1200 mL?

A. 1500 mL B. 1700 mL C. 2200 mL D. 2700 mL

44. Reduction in pH of blood will:

A. Decrease the affinity of hemoglobin with oxygen B. Release bicarbonate ions by the liver C. Reduce the rate of heart beat D. Reduce the blood supply to the brain

45. Serum differs from blood in:

A. Lacking globulins B. Lacking albumins C. Lacking clotting factors D. Lacking antibodies

46. The QRS complex in a standard ECG represents:

A. Repolarisation of auricles B. Depolarisation of auricles C. Depolarisation of ventricles D. Repolarisation of ventricles

47. Removal of proximal convoluted tubule from the nephron will result in:

A. No urine formation B. More concentrated urine C. More diluted urine D. No change in quality and quantity of urine

48. Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction:

A. Calcium B. Magnesium C. Sodium D. Potassium

49. Myelin sheath is produced by:

A. Astrocytes and Schwann cells B. Oligodendrocytes and Osteoclasts C. Osteoclasts and Astrocytes D. Schwann cells and Oligodendrocytes

50. Which of the following is an amino acid derived hormone?

A. Epinephrine B. Ecdysone C. Estrogen D. Estradiol

NEET Biology Practice Questions (41-50)