Seventy percent of our body mass is water. Without keeping the right amount of water we would die. The kidney is the key means of this control (see later). 6. Temperature. The enzymes that control every chemical reaction in our body work best at their optimum temperature of 37 degrees Centigrade. If our body cells get too hot or too cold they would die.
Hywel Vaughan. answered on 25 Jun 2010: Hi wildrosa, The biggest vein in the body is the âinferior vena cavaâ â this is the vein that returns the blood from the bottom of your body to your heart. The blood is de-oxygenated, and enters the right atrium of your heart â this is at the lower right, back side of your heart.
The great cardiac vein is one of the largest veins in the body. It is located in the heart, leading away from the coronary sinus.