on my test it was the 3rd answer but i dont know what website ur using
A) the fingers typing on a keyboard
Answer would be A, Muscles move your bones
Without the Muscular System, your bones would not be connected properly
Blood transports materials to and from different parts of the body
Cardiac muscle tissue
cardiac muscle tissue
Contraction and relaxation of the heart is the function of the muscular system whereby illustrated by the pumping of the blood by the heart throughout the body. Though everyone is not aware, the constant contraction and relaxation of the muscles help fight gravity, that is why the muscular system is a great help in maintaining good posture.
The left side of the heart pumps blood through the systemic circulation, which delivers oxygen and nutrients to all the remaining tissues of the body.
there are two major types of blood circulation in the bodysystemic circulationpulmonary circulation.
in systemic circulation the artery , capillary and veins are channels through which blood gets circulated in the systemic circulation.
answer; ///(b) it is composed of four protein chains and four heme groups;
the correct answer to this question is #5