Which of the following are the INCORRECT statements?

(i) The Malpighian corpuscle, PCT and DCT of the nephron are situated in the cortical region of the kidney whereas the loop of Henle dips into the medulla. 

(ii) In majority of nephrons, the loop of Henle is too short and extends only very little into the medulla. Such nephrons are called juxta medullary nephrons.

(iii) In some of the nephrons, the loop of Henle is very long and runs deep into the medulla. These nephrons are called cortical nephrons.

(iv) Each kidney of an adult human measures 10-12 cm in length, 5-7 cm in width, 2-3 cm in thickness with an average weight of 120- 170 g.

(v) Towards the centre of the inner concave surface of the kidney is a notch called calyx.

(ii), (iii) and (v).

The correct answer is Option (2) - (ii), (iii) and (v).

Kidneys are reddish brown, bean shaped structures situated between the levels of last thoracic and third lumbar vertebra close to the dorsal inner wall of the abdominal cavity. Each kidney of an adult human measures 10-12 cm in length, 5-7 cm in width, 2-3 cm in thickness with an average weight of 120- 170 g.
Towards the centre of the inner concave surface of the kidney is a notch called hilum through which ureter, blood vessels and nerves enter. Each kidney has nearly one million complex tubular structures called nephrons, which are the functional units. The Malpighian corpuscle, PCT and DCT of the nephron are situated in the cortical region of the kidney whereas the loop of Henle dips into the medulla. In majority of nephrons, the loop of Henle is too short and extends only very little into the medulla. Such nephrons are called cortical nephrons. In some of the nephrons, the loop of Henle is very long and runs deep into the medulla. These nephrons are called juxta medullary nephrons.