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 Small Saphenous Vein (SSV) is the second main superficial vein in the leg (the main superficial vein in the leg being called the Great Saphenous Vein (GSV)). It is called a truncal vein as it is one of the long straight veins in the leg. The Great Saphenous Vein is the other truncal vein in the leg.he Small Saphenous Vein (SSV) is the second main superficial vein in the leg (the main superficial vein in the leg being called the Great Saphenous Vein (GSV)). It is called a truncal vein as it is one of the long straight veins in the leg. The Great Saphenous Vein is the other truncal vein in the leg.