Why do the UK and portugal have the same time zone but france and spain have different ones?t is because Portugal is a long way West. Originally Portugal adopted CET, but changed it to be the same as UK time in the 1990's Peter. Source(s): Business with Portugal / UK / Europe. MPPRH Â· 7 years ago.
The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone. The heart pumps blood through the network of arteries and veins called the cardiovascular system. The right atrium receives blood from the veins and pumps it to the right ventricle.
The sinoatrial, or SA, node is located in the right atrium. It provides the main control and is the source of each beat. The SA node also keeps up with the body's overall need for blood and increases the heart rate when necessary, such as during exercise, emotional excitement, or illness such as fever.