TY - CHAP M1 - Book, Section TI - Cardiac Anatomy A1 - Freeman, Brian S. A1 - Berger, Jeffrey S. PY - 2024 T2 - Anesthesiology Core Review: Part One: BASIC Exam, 2nd Edition AB - In humans, blood circulates within a closed system of blood vessels. The system is said to be closed because arteries and veins are connected with each other through small vessels. This requires the action of a pump, which is provided by the heart. The heart is composed of four chambers, right atrium and ventricle, and the left atrium and ventricle. The right and left atria receive blood from the venous system and the left atrium and ventricles pump blood into the arterial system. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/10/04 UR - accessanesthesiology.mhmedical.com/content.aspx?aid=1204769844 ER -