Question

Consider the following four statements (i) - (iv) and select the correct option.i.SA node is natural pacemaker of heart.ii.Human heart has inter-auricular foramen.iii.Right atrioventricular valve is a semilunar valve.iv.Normal systolic and diastolic pressure of humans is 120 and 60 mm Hg respectively.

• A. i - F, ii - F, iii - T, iv - F
• B. i - F, ii - F, iii - T, iv - T
• C. i - T, ii - T, iii -F, iv - T
• D. i - T, ii - F, iii - F, iv - F

Answer 1

The correct option is D i - T, ii - F, iii - F, iv - F

i. S-A node has a unique property of self-excitation, which enables it to act as the "pacemaker" of the heart.

ii. The two auricles are separated from each other by a partition, the interauricular septum. The septum has an oval, thin area called the fossa ovalis. It marks the position of an opening the foramen ovale, between the two auricles in the foetus.

iii. The right auricle opens into the right ventricle through a wide passage, the right auriculoventricular or A-V aperture. This aperture is guarded by a one-way valve called tricuspid valve.

iv. In a normal adult person, the average systolic/ diastolic pressure are 120*80 mm Hg.

So, the correct answer is 'i-T, ii-F, iii-F, iv-F'.