The volume of blood in a person's body is proportional to body weight. A person who weighs 100 pounds has approximately 3 quarts of blood. Estimate the number of quarts of blood in a person who weighs 130 pounds.

A person weighing 130 pounds have 3.9 quarts of blood.

Explanation:

A person's blood volume as same as the amount of his body weight.

If a 100 pound person has 3 quarts, then

•Blood volume in 100 pounds is 3 quarts

•Blood volume in 1 pound is 3/100

•Blood volume in 130 pounds is 3/100×130 which is 3.9 quarts.

answer: the answer is d.

explanation: this is because when you exercise you make your muscle produce a certain liquid, that does not evaporate it.   also when you exercise you do not reduce muscle fiber.   and it does not really control your twitch that much.