Answer:
Circulatory system is an organ system which is composed of the heart and blood vessels. Blood vessels consists of arteries, veins, and capillaries.
Explanation: Heart is the pumping organ which pumps oxygenated blood to all cells of the body and bring back deoxygenated blood from all the cells.
Blood vessels consists of arteries, veins and capillaries. Arteries are the vessel which carry oxygenated blood. Veins are the vessel which carry deoxygenated blood and capillaries are the tiny vessel which are connected to the every cell from arteries and Veins.
Should be A the newer layers are usually on top
The answer is true thank you ;)))
The possible energy sources for muscle contraction from the list include:
<h3>What is Energy?</h3>
This is referred to as the ability to do work and the major fuel in the body is referred to as glucose.
Glycogen in muscles also acts as a fuel although its synthesis is usually very slow.
Read more about Energy here brainly.com/question/13881533
#SPJ1
