Ch 12-Cardiovascular system Flashcards
Arteries
Carry blood away from the heart
Veins
Carry blood toward the heart
Capillaries
Tiny blood vessels that join the arterial and venous systems and carry blood to the organs
Heart
Surrounded by the pericardium (fluid filled sac) located in the thoracic cavity
The heart is connected to
The aorta, the inferior and superior venae cavae, and the pulmonary veins and arteries
Heart has four chambers
Right and left atria
Right and left ventricles
Septum
Separates the right and left sides of the heart
Atrioventricular valves
Allow blood flow from from atria to ventricles
Right atrioventricular valve
Left atrioventricular valve
Tricuspid valve
Bicuspid or mitral valve
Semilunar valves
Allow blood to flow from the ventricles to arteries
Pulmonary semilunar valve
Allows blood to flow from the right ventricles to the pulmonary artery
Aortic semilunar valve
Allows blood to flow from the left ventricle into the aorta
From inside out layers of the heart walls are
Endocardium
Myocardium
Epicardium
Pericardium
A sac filled with pericardial fluid
Outer covering of the pericardium
Parietal layer
Inner lining of the pericardium
Visceral layer also epicardium
Conduction system
Hearts electrical system
Conduction system consists of
Sinoatrial node SA node or pacemaker Atrioventricular node Atrioventricular bundle Right and left bundle branches Purkinje fibers
SA node (pacemaker)
Initiates an impulse, which is sent to the AV node causing the atria to contract, and then to the AV bundle, the right and left bundle branches and Purkinje fibers, causing the ventricle to contract
An ECG shows
P waves (atrial contraction) QRS waves (ventricular contraction) T waves (ventricular recovery)
Cardiovascular system (CVS) includes
Heart Blood vessels (arteries, veins, and capillaries) It delivers oxygen and nutrients to all of the body's cells, and carries away carbon dioxide and waste products
Constrict/o
To draw together
Dilat/o
To expand
Angiography
Process of recording a blood vessel using X-rays following injection of a contrast medium