Unit 10 Patho Flashcards
Describe the function of the cardiovascular system.
The primary function is transport of materials such as nutrients, water, and gases from external environments from cell to cell within the body.
What are the differences of veins and arteries?
Arteries are BVs that carry blood away from heart.
Veins are BV that carry blood to heart
Describe the flow of blood for Pulmonarmy circulation.
Blood enters the Right Atrium (From superior and inferior vena cava) ➡️ Right Ventricle ➡️ Pulmonary Artery (blood becomes oxygenated) ➡️ Pulmonary veins (left side)
Describe the flow of blood for Systemic Circulation.
Pulmonary veins➡️ Left atrium ➡️ Left ventricle ➡️ Aorta
What is the flow of liquid and gas in the cardiovascular system?
Liquids and glasses flow down to pressure gradients from regions of higher pressure to regions of lower pressure.
What is the mean BP in the aorta and vena cava?
~93 mmHG in the aorta
~2 mm HG in the vena cava
The heart creates higher pressure when it contracts (blood flows out of the heart into closed loop of blood vessels which are lower pressure)
Pressure is lost as blood moves through system
What is Hydrostatic pressure?
Fluid not moving and pressure is exerted in all directions
What is pericardial fluid?
Fluid that lubricates the external surfaces of the heart (the pericardium)
Pericarditis is inflammation of the pericardium, this may reduce this lubrication allowing friction rub.
What is myocardium?
Cardiac muscle covered by thin layers of epithelium and connective tissue
What’s is the role of the heart valves?
They prevent back flow of blood
Where are the AV, Tricuspid, and Bicuspid valve?
Av (Atrioventricular Valve): Guards between atrium and ventricles
—Tricuspid valve: separates the right atrium and right ventricle
— Bicuspid valve (Mitral valve): separates the left atrium and left ventricle
What are semilunar valves?
Semilunar valves are crescent moon-shaped; between ventricles and arteries
—Aortic valve: Between left ventricle and aorta
—Pulmonary valve: Between right ventricle and pulmonary trunk
What is chordae tendinae
Collagenous tendons that are attached to edges of valve flaps.
What are Papillary muscles?
Ventricular muscles that chordae are attached to and provide stability for, they cannot actively open and close the valve, they prevent back flow to the atrium.
What are autorhythmic cells ?
They make up 1% of cardiac muscle cells, called “pacemakers” and they set the rate of heartbeat and send signals for myocardial contraction.
These cells are small and contain few contractile fibers.
They do NOT have organized sarcomeres and do NOT contribute to contractile force of the heart