Which systems interact to maintain blood pressure?
a. urinary, circulatory, endocrine
b. circulatory, respiratory, nervous
c. muscular, endocrine, nervous
d. urinary, endocrine, nervous

The answer is B. circulatory, respiratory, and nervous systems

Although all systems in the body are interrelated and impact one another, the systems that have the most important roles in regulating blood pressure are the ones in B. The circulatory, obviously, is the most important because it consists of the heart, blood vessels, and blood. When the heart pumps blood, it creates pressure on your arteries. These processes are communicated throughout your body using the brain or nervous system. The respiratory system also works closely with the circulatory system because when oxygen enters the blood, it travels to the heart and is pumped to the rest of the body.

Fossil found in strata reveal that unused body part decrease in size

It allows water to resist freezing and thawing cycle.