flow in arteries and veins Flashcards
systolic pressure
pressure generated by the heart during contraction that is the highest pressure at the aorta
how is arterial pressure measured
vibrations from blood flow are measured
mean arterial pressure
where maxximum vibrations occur in the artery
pressure in aorta
during systole , aorta expands while the blood flows through
during diastole , aorta recoils and this generates energy for pushing the blood
what affects pressure distribution in arteries ?
stroke volume
velocity of ejection
total peripheral resistance
elasticity of arteries
pressure distribution throughout the vascular tree
there is a general drop in pressure throughout the tree
velocity of blood in different blood vessels
highest in aorta and slowest in capillaries
pressure in veins
low
factors that affect venous return
gravity
respiratory pump
thoracic pump
effect of gravity on the arteries
causes pooling of blood
what is a sign of right sided heart failure
jugular venous pressure
skeletal muscle pump in venous return
rhythmic contraction of the skeletal muscle increases venous return and end diastolic volume
travel and fresh socks importance
prevents deep vein thrombosis
respiratory pump
during expiration , there is an increase in the pressure of the thoracic cavity increases which means there is reduced venous flow to the heart as there is increased pressure
venomotor tone
it is the state of contraction of the smooth muscle that surrounds venules and veins .
systemic filling pressure
pressure that is generated through the contraction of the ventricles and transmitted through vascular tree to the vein
two mechanisms that clotting involves
platelet plug
formation of a fibrin clot
arrangement of the endothelium in a normal blood vessel
red blood cells in the periphery
platelets
conversion of fibrin
soluble fibrinogen to insoluble fibrin by thrombin
