Question | Answer |
Sends oxygen-depleted blood to the lungs to pick up oxygen and unload carbon dioxide | Pulmonary ciruit |
Sends oxygen-rich blood and nutrients to all body cells and removes waste | Systemic circuit |
The heart is within the_______ | Mediastinum |
Encloses the heart and the proximal ends of the large blood vessels to which it attaches | Pericardium |
Outer layer of the wall of the heart that protects the heart by reducing friction | Epicardium |
Thick middle layer of the wall of the heart | Myocardium |
Inner layer of the wall of the heart | Endocardium |
Upper chambers of the heart that recieve blood returning to the heart | Atria |
Lower chambers of the heart that recieve blood from the atria and contract to force blood out of heart into arteries | Ventricles |
Separates the atrium and ventricle on the right side from their counterparts on the left | Septum |
Opening between right atrium and right ventricle | Tricuspid valve |
Entrance to pulmonary trunk | Pulmonary valve |
Opening between left atrium and left ventricle | Mitral valve (Bicuspid) |
Entrance to aorta | Aortic valve |
Supply blood to the tissues of the heart | Coronary arteries |
Phase of the cardiac cycle when a heart chamber wall contracts | Systole |
Phase of the cardiac cycle when a heart chamber wall relaxes | Diastole |
A mass of merging cells that function as a unit | Functional syncytium |
Coordinates the events of the cardiac cycle | Cardiac conduction system |
A decrease in the diameter of a blood vessel | Vasocolstriction |
An increase in the diameter of a blood vessel | Vasodilation |
Carries blood under relatively high pressure from heart to arteioles | Artery |
Connects an artery to a capillary | Arteriole |
Connects an arteriole to a venule | Capillary |
Connects a capillary to a vein | Venule |
Carries blood under relatively low pressure from a venule to the heart | Veins |
The volume of blood discharged from the ventricle with each contraction | Stroke volume |
The volume discharged from the ventricle per minute | Cardiac output |
Equals the sum of the formed elements and plasma volumes in the vascular system | Blood volume |
A force produced by friction between the blood and the walls of blood vessels | Peripheral resistance |
The ease with which a fluid's molecule flow past one another | Viscosity |