Kidneys in human beings are a part of t he system of
(1) Nutrition (2) Respiration (3) Excretion (4) Transportation

If the saliva is lacking in salivary amylase then which of the following processes taking place in the buccal cavity will  be affected?

(1) Proteins breaking down into amino acids 
(2) Starch breaking down into sugars
(3) Fats breaking down into fatty acids and glycerol 
(4) Intestinal layer breaking down leading to ulcers

The correct pathway of blood in circulatory system is

(1) Auricles -> Ventricles -> Arteries -> Veins
(2) Ventricles -> Auricles -> Veins -> Arteries
(3) Ventricles -> Veins -> Arteries -> Auricles
(4) Veins -> Ventricles -> Arteries -> Auricles

What is the weight of the brain of an adult human?

(1)  1350gm
(2)  1.350gm
(3)  1530gm
(4)  3150gm

Which one is the most poisonous excretory substance

(1) Uric Acid
(2) Urea
(3) Ammonia
(4) Hippuric Acid