Heart: hollow muscular organ which acts as a continuous double pump to transport blood throughout the body; associated with the root ________.

Pericardium: double-layered sac surrounding the heart and the roots of the ________.

Epicardium: innermost part of the pericardium and outermost part of the ________.

Myocardium: ________ muscle.

Endocardium: inner lining of the heart’s ________ and valves.

Atrium: upper heart chamber responsible for receiving blood from the veins which lead to the ________.

Ventricle: lower heart chamber responsible for pumping blood away from the ________.

Papillary Muscles: muscles located in the ventricles of the heart which attach to atrioventricular valves via ________.

Superior Vena Cava: large vein carrying deoxygenated blood from the upper body to the ________.

Inferior Vena Cava: large vein carrying deoxygenated blood from the lower body to the ________.

Pulmonary Arteries: great blood vessels carrying deoxygenated blood from the right ventricle to the ________.

Pulmonary Veins: ________ blood vessels carrying oxygenated blood from the lungs to the left atrium.

Aorta: ________ artery carrying oxygenated blood from the heart to be distributed throughout the body.

Bicuspid (Mitral) Valve: atrioventricular valve between the ________ atrium and left ventricle.

Aortic Valve: semilunar valve between the left ventricle and ________.

Coronary Arteries: blood vessels which provide oxygenated blood to heart tissues; originate at the aortic sinuses within the ________.

Coronary Veins: blood vessels which drain deoxygenated blood from the heart tissues; open into the coronary sinus in the ________ atrium.

Sinoatrial (SA) Node: specialized muscle tissue in the upper wall of the right atrium responsible for creating an electrical impulse which spreads over the atria, causing them to ________.

Atrioventricular (AV) Node: specialized muscle tissue in the interatrial septum responsible for relaying and slowing the electrical impulse created by the SA node before the signal travels to the ________.

Atrioventricular Bundle (Bundle of His): bundle of specialized muscle fibers which conduct electrical impulses from nodes to Purkinje fibers in ________.

Diastole: phase of the cardiac cycle in which the atria and ventricles are relaxed, allowing the chambers to fill with _______.

Atrial Systole: phase of the cardiac cycle in which the atria contract, pushing blood into the ventricles and building _______.

Ventricular Systole: phase of the cardiac cycle in which the ventricles contract, pressure builds until outflow valves open and blood is ejected from the _______.

Isovolumetric Relaxation: phase of the cardiac cycle in which the ventricles relax, reducing pressure and forcing atrioventricular valves open to begin _______.

Blood Vessels: hollow tubular organs which carry blood throughout the _______.

Lumen: hollow passageway in a blood vessel through which blood _______.

Arteries: blood vessels which carry blood away from the heart to the capillaries, providing oxygen and nutrients to body _______.

Capillaries: smallest blood vessels which are responsible for carrying out oxygen and nutrient exchange at the body _______.

Veins: blood vessels which carry blood from capillaries toward the heart, relieving body tissues of _______.

Blood: fluid which flows through blood vessels to transport nutrients throughout the _______.

Heart Rate: speed at which the heart _______.

Pulse: rhythmic dilation of an artery due to blood pumping within it as the heart _______.

Blood Pressure: ________ exerted by blood on the walls of arteries as it pumps through the body.

Systolic Pressure: blood pressure reading indicating ________ pressure during ventricular systole (contraction).

Diastolic Pressure: blood pressure reading indicating ________ pressure during diastole (relaxation).