Why do we urinate more frequently during cold and humid weather?

Identify the true statements and choose the correct option accordingly.
$I.$ Blood vessel leading to the glomerulus is called efferent arteriole.
$II.$ Vasa-recta,peritubular capillaries and glomerulus,all have blood.
$III.$ Cortical nephrons have highly reduced vasa-recta.
$IV.$ Vasa-recta runs parallel to the Henle's loop in the juxta-medullary nephron.

Choose the correct pair regarding urine formation.

Cholera patients are given saline solution because .......

Urea enters the nephron through . . . . . . .
$i$. Thicker segment of ascending limb of Henle's loop.
$ii$. Thinner segment of ascending limb of Henle's loop.
$iii$. Ultrafiltration into urinary space.
$iv$. Inner medullary segment of collecting tubule.
$v$. Outer medullary segment of collecting tubule.
Select the correct option.

Complete the following:
$(a)$ Urinary excretion = tubular reabsorption + tubular secretion -..........
$(b)$ Dialysis fluid = Plasma -..........