per-ih- KAR -dee-al S/ P/ R/ S/ -um structure peri- around -cardi- heart -al pertaining to A double layer of membranes surrounding the heart Pertaining to the pericardium pulmonary PULL -moh- NAR -ee S/ R/ -ary pertaining to pulmon- lung Pertaining to the lungs and their blood supply Blood Flow through the Heart
Your heart has four chambers through which your blood flows . These chambers are the: Right atrium , Right ventricle , Left atrium, Left ventricle;Your right and left atria are separated by a thin muscle wall called the interatrial septum. Your right and left ventricles are divided by a thicker muscle wall called the interventricular septum. Your left ventricle pumps blood to all the parts of your body (except the lungs) through the systemic circulation. Oxygen (O 2 ) and nutrients are delivered to your body's cells, and carbon dioxide (CO 2 ) and metabolic waste products are removed from the cells. This deoxygenated blood, via the veins, returns to the heart where the right ventricle pumps blood into the pulmonary circulation to the lungs. In the lungs, the carbon dioxide waste material is exchanged for oxygen from inhaled air. This oxygenated blood then travels through the pulmonary veins back to the left side of the heart. You have four valves that work together to ensure the correct flow of blood through your heart ; on the right side are the tricuspid and pulmonary valves, and on the left side are the mitral (bicuspid) and aortic valves. The pulmonary circulation is the only place in the body where deoxygenated blood is carried in arteries and oxygenated blood is carried in veins. WORD PRONUNCIATION ELEMENTS DEFINITION atrium atria (pl) atrial (adj) A -tree-um A -tree-ah A -tree-al S/ R/ S/ -um structure atri- entrance, atrium -al pertaining to Chamber where blood enters the heart on both the right and left sides Pertaining to the atrium bicuspid by- KUSS -pid S/ P/ R/ -id having a particular quality bi- two -cusp- point Having two points; a bicuspid heart valve has two flaps interatrial IN -ter- AY -tree-al S/ P/ R/ -al pertaining to inter- between -atri- atrium Between the atria of the heart interventricular (IV) IN -ter-ven- TRIK -you- lar S/ P/ R/ -ar pertaining to inter- between -ventricul- ventricle Between the ventricles of the heart mitral MY- tral Latin turban Shaped like the headdress of a Catholic bishop septum septa (pl) SEP -tum SEP -tah Latin partition A thin wall dividing two cavities tricuspid try- KUSS -pid S/ P/ R/ -id having a particular quality tri- three -cusp- point Having three points; a tricuspid heart valve has three flaps ventricle VEN -trih-kel Latin small belly Chamber of the heart (pumps blood) or a cavity in the brain (produces cerebrospinal fluid) The Heartbeat The actions of the four heart chambers are coordinated. When the atria contract (atrial systole ), the ventricles relax (ventricular diastole ). When the atria relax (atrial diastole), the ventricles contract (ventricular systole). Then the atria and ventricles all relax briefly. This series of events is a complete cardiac cycle, or heartbeat.The “lub-dub, lub-dub” sounds heard through the stethoscope are made by the heart valves snapping as
You've reached the end of your free preview.
Want to read all 20 pages?
- Fall '19