Question

question 3 based on the article, which of these is true? a. sodium and potassium are found in sweat. b. electrolytes make water harder to drink. c. the human brain contracts and relaxes. d. electrical signals block movement.

Explanation:

Sodium and potassium are common electrolytes found in sweat. Electrolytes do not make water harder to drink. The human heart contracts and relaxes, not the brain. Electrical signals are involved in muscle - movement, not blocking it.

Answer:

A. Sodium and potassium are found in sweat.