Which one of the following is mainly responsible for the second heart sound?

• Closure of atrioventricular valves

• Opening of atrioventricular valves

• Closure of semilunar valves

• Thrust of blood on ventricular wall during atrial contraction

Juxtaglomerular apparatus is made up of

• juxtaglomerular cell, macula densa and lacis cell

• juxtaglomerular cell, Purkinje cell and chied cell

• juxtaglomerular cell, lads cell and myoepithelial cell

• juxtaglomerular cell, macula densa and Argentaffin cell

Which vitamin helps in blood coagulation?

• Vitamin- K

• Vitamin- C

• Vitamin- A

• Vitamin- D

Brunner's gland is present in

• duodenum

• jejunum

• ileum

• rectum

In a normal adult human, the average cardiac output (stroke volume) is

• 47 mL

• 70 mL

• 5 L

• 3.3 L

Amount of oxygen supplied by 100 mL arterial blood while passing through the tissues is

• 0.4 - 0.6 mL

• 4 - 6mL

• 14 - 15 mL

• 19 - 20 mL

Cholecystokinin stimulates the secretion of

• bile

• gastric juice

• pancreatic juice

• succus entericus

Which one of the following is incorrect for Atherosclerosis?

• Constriction of arterial luman reduces the blood flow

• Loss of dilatation ability of the arterial wall and its rupture

• Cholesterol deposition at the inner wall of the artery

• Proliferation of the vascular muscles

Which one of the following statement is incorrect?

• Glucagon is secreted by pancreas

• Androgen is produced by ovary

• Thyroxine is secreted by thyroid

• Oxytocin is secreted by pituitary

Bone is mainly composed of

• iron and phosphorus

• sulphur and calcium

• calcium and phosphorus

• calcium and magnesium