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
Mina (given name) hanja with the reading "min" and 20 hanja with the reading "a" on the South Korean government's official list of hanja which may be used in given names. For the name Mi-na (미나), there are 31 hanja with the reading "mi" and 16 hanja with the reading "na" on the South Korean government's official list of hanja which may be used in given names. Mina () is a female given name in Iran, meaning "azure", "glass bead", or "enamel". Mina () means "love" in Pashto, an Indo-Iranic language spoken in Afghanistan and the northwestern regions of Pakistan, which is the