___________part of nephron has evolved to form hypertonic urine.

(a)

Glomerulus

(b)

Loop of Henle

(c)

Proximal convoluted tubule

(d)

Collecting duct

The major function of Henle's loop is to concentrate_____________

(a)

Na⁺ and Cl^-

(b)

K⁺ ions

(c)

Na⁺ and K⁺ ions

(d)

Na^- and CI⁺ ions

Normal urea level in human blood is about_______________

(a)

20-23 gms / 100 mL

(b)

17-30 mg / 100 mL

(c)

17 - 25 gms / 100 mL

(d)

15- 25 mg / 100 mL

______________is not a excretory organ.

(a)

Kidney

(b)

Lungs

(c)

Heart

(d)

Liver

Which part of nephron has evolved to form hypertonic urine?

(a)

Glomerulus

(b)

Loop of Henle

(c)

Proximal convoluted tubule

(d)

Collecting duct