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Chapter 5 Med Terms
Cardiovascular System
Term | Definition |
---|---|
Cardiovascular | Pertaining to the heart and blood vessels. |
Pericardium | The double walled membranous sac that encloses the heart. |
The 3 Layers of the heart | Epicardium, Myocardium, and the Endocardium. |
Epicardium | The external layer of the heart. |
Myocardium | The middle and the thickest of the 3 layers of the heart, consists of the cardiac muscle. |
Endocardium | The lining of the heart. |
The Atria | The two upper chambers of the heart which are the receiving chambers. |
The Ventricles | The two lower chambers of the heart which pump blood from the heart. |
Systemic circulation | Blood flow to all parts of the body except the lungs. |
Pulmonary circulation | The flow of blood between the heart and the lungs. |
The electrical impulse (P wave) | Is due to the contraction of the atria. |
The electrical impulse (QRS wave) | The contraction of the ventricles. |
The electrical impulse (T wave) | Shows the relaxation of the ventricles. |
The lumen | The opening within the vessel through which blood flows. |
Arteries | The large blood vessels that carry blood away from the heart to all regions of the body. It is the high oxygen content that gives arterial blood it's bright red color. |
Veins | Low pressure collection vessels that the waste filled blood back to the heart. |
Systolic pressure | Occurs when the ventricles contract and is the highest pressure against the walls of the vessels. |
Diastolic pressure | Occurs when the ventricles are relaxed and is the lowest pressure on the walls of the blood vessels. |
Erythrocytes | Also known as red blood cells. |
Hemoglobin | The iron containing pigment of the red blood cells, and transports oxygen from the lungs to the tissues of the body. |
Leukocytes | Also know as white blood cells. They protect the body against harmful invaders such as bacteria. |
Cardiologist | A physician who specializes in diagnosing nd treating diseases and disorders of the heart. |
Myocardial infarction | Also known as a heart attack. |
Bradycardia | An abnormally slow heartbeat |
Tachycardia | An abnormally fast heartbeat. |