Heart produces two types of sounds. 1st sound: ‘Lubb’ is produced by closure of bicuspid and tricuspid valves. 2nd sound: ‘Dup’ is produced by closure of semilunar valves present at the base of aorta to avoid back flow of blood into the ventricle.

Correct Option: A

Heart produces two types of sounds. 1st sound: ‘Lubb’ is produced by closure of bicuspid and tricuspid valves. 2nd sound: ‘Dup’ is produced by closure of semilunar valves present at the base of aorta to avoid back flow of blood into the ventricle.

The pulse making impulse travels in the heart in the order of SA node→AV node→bundle of His→Purkinje fibres→heart muscles.

Correct Option: D

The pulse making impulse travels in the heart in the order of SA node→AV node→bundle of His→Purkinje fibres→heart muscles.

An adult human with average health has systolic and diastolic pressures as 120 mm Hg and 80 mm Hg respectively.

Correct Option: B

An adult human with average health has systolic and diastolic pressures as 120 mm Hg and 80 mm Hg respectively.

Mast cells contain granules of heparin and histamine. Heparin prevents blood clotting. Histamine produces inflammation.

Correct Option: B

Mast cells contain granules of heparin and histamine. Heparin prevents blood clotting. Histamine produces inflammation.

Arteries have thick wall and narrow lumen while veins have thin walls and large lumen. Arteries do not have valves.

Correct Option: D

Arteries have thick wall and narrow lumen while veins have thin walls and large lumen. Arteries do not have valves.