Heart depending on what is counted as a chamber. The atrium and ventricle are sometimes considered "true chambers", while the others are considered "accessory chambers". Primitive fish have a four-chambered heart, but the chambers are arranged sequentially so that this primitive heart is quite unlike the four-chambered hearts of mammals and birds. The first chamber is the sinus venosus, which collects deoxygenated blood from the body through the hepatic and cardinal veins. From here, blood flows into the atrium and then to the powerful muscular ventricle where the main pumping action will take place. The fourth and final chamber is the
Jade (given name) for boys and girls in the United States with multiple spelling variants, is also sometimes seen as a variant of Jade. Jade has become increasingly popular in France since 1990. It was the 7th most given name for girls there in 2005. Jade (given name) Jade is a given name derived from the ornamental stone jade, which is used in artwork and in jewellery making. The name is derived from the Spanish "piedra de la ijada", which means "stone of the colic." There was a belief that when jade was placed on the stomach, it could cure colic in babies.