Q.What is the composition of sweat produced by sweat glands?

Sweat produced by the sweat glands is a watery fluid.

• Its main component is sodium chloride.
• It also carries small amounts of urea, lactic acid and similar substances. …

The skin contributes to excretion partly through the activity of its sweat glands, whose secretion has a fairly specific composition.

• Sweat is fundamentally a watery fluid.
• It contains sodium chloride as its main dissolved component.
• Alongside this, it carries small amounts of urea, lactic acid and similar substances, which represent a minor but genuine excretory contribution. …

Method: Describing the Composition of a Minor Excretory Secretion

This method applies to any "what is X secretion made of" question about an accessory excretory structure (skin glands, tears, etc.) where the organ's main job isn't excretion at all.

Steps

Step 1: Identify the gland's primary, non-excretory role first

Always start with what the gland is mainly FOR — this tells you what its secretion is built around before you think about waste. Sweat glands exist primarily for thermoregulation (cooling by evaporation), not waste removal.

Step 2: Identify the base/solvent of the secretion

Decide whether the secretion is fundamentally watery or oily — this determines which class of waste products it is even capable of carrying (water-soluble wastes ride in a watery secretion; fat-soluble/lipid wastes ride in an oily one).

Step 3: List the major dissolved component, then the minor excretory riders …