Secretions from the skin, such as sweat, protect the body because a. contain pathogens b. release histamines. c. are slightly acidic. d. contain white blood cells.

The right answer is C.are slightly acidic.

Sweat is a biological fluid secreted by the sweat glands during the phenomenon of perspiration which plays an important role for the control of the body temperature (evacuation of 580 Kcal per liter of evaporated sweat).

The composition of sweat depends on the state of health of each individual and his diet.

It contains in variable quantity:

- water (99%)

- Mineral salts (sodium chloride, zinc, copper, iron)

- Vitamin C

- Antibodies

- Urea

- uric acid

- Ammonia

- Lactic acid (this substance attracts mosquitoes).

It normally has an acid pH, which is around 4 to 6.

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