Q. What transports substances around the body?

Q. What is involuntary contractions of voluntary muscles to warm up?

Q. What is the evaporation of a liquid to cool the body?

Q. Which of the following is an example of positive feedback to indirectly maintain homeostasis?

Q. Homeostasis

Q. Homeostasis in the human body is often maintained by a: 

Q. Positive feedback is when the change caused by the stimulus is

Q. When you get cut, your skin cells release hormones that signal platelets to come and stop the bleeding. Platelets then release more hormones that signal even more platelets to help stop bleeding. The hormone signals continue until the cut is closed.

Q. When you are cold, you shiver and your blood vessels contract, which warms you up. When you are hot, you sweat and your blood vessels expand, which cools you down.  

Q. Water diffusing with the concentration gradient from high water concentration to low water concentration across a cell membrane is....

Q. Which is the largest structure?