Life Science- Life Science Flashcards
Function
Transport gases, nutrients, wastes and hormones
Atrioventricular valves
Between atria and ventricles.
Bicuspid (mitral) under left atrium
Tricuspid under right atrium
When valves are open blood drains from atria into ventricles.
When ventricles contract, valve flaps are forced shit, blocking blood from re-entering atria.
Semilunar valves
Located in arteries leaving ventricles
Pulmonic valve at base of pulmonary artery
Aortic valve at base of aorta
When ventricles contract, valves are forced open and let blood flow.
When ventricles relax, back flow of blood fills flaps of valves and forces them shut.
Blood vessels
Arteries carry blood away from heart
Veins carry blood to heart
Capillaries connect arteries to veins and exchange gases with tissues
Arteries
High pressure
Very thick, stretchy walls that expand in size
Most carry oxygenated blood
Damaged arteries spurt in time to heart beat
Aorta
Largest vessel
Receives blood from left ventricle
Arteriales
Smaller vessels connecting arteries to capillaries
Veins
Low pressure
Have valves to prevent back flow of blood against gravity.
Most carry de-oxygenated blood
Damaged veins ooze blood
Vena cava
Dump all blood from body into right atrium
Superior- receives blood from upper body
Inferior- receives blood from lower body
Venules
Smaller vessels connecting veins to capillaries
Capillaries
Connect arteries and veins
Walls are one cell thick
Allow for exchange of gases through thin walls(drop off oxygen delivered from heart by arteries and pick up carbon dioxide and send it to the heart through veins)
Coronary arteries
Exit aorta and supply oxygen or blood to heart muscle (myocardium)
Coronary veins
Pick up and return deoxygenated blood from myocardium
Vein bursts
And causes bruising
Hard blow to
Chest will upset the rhythm of heart
