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
Caleb (given name) Caleb (given name) Caleb is a Hebrew masculine given name. The Hebrew spelling of the name Caleb – כלב – is identical with the spelling of the word "dog" – "kelev". The composing of the Bible antedates by thousands of years the introduction of the Niqqud system of diacritical signs which modern Hebrew uses to represent vowels. Thus, it is difficult to ascertain how the name was originally pronounced. Many name books and websites list the meaning of "Caleb" as "Dog". Many Biblical characters bore animal names, including names which in the sensibilities of later times would be considered insulting,