pressure and flow in the arteries and veins Flashcards
what happens when the ventricle contacts and the aortic valve opens and blood is ejected out
the aorta and arteries arteries expand and store pressure in the elastic walls (systole)
what happens when isovolumic ventricular relaxation occurs and the aortic valve closes
elastic recoil of arteries sends blood forward into the rest of the circulation system (diastole)
what four things effect the pressure wave
stroke volume, velocity ejection, elasticity of the arteries and the total peripheral resistance
what is normal BP
120/80 mm Hg
what happens to the blood as it travels through the circulatory system
the blood loses pressure
what type of circulation (pulmonary or systemic) is higher in pressure
systemic (1/5th)
what is velocity related to
total cross sectional area
what is something that has a large effect on veins
external effects
what five things have a large impact on the venous pressure
gravity, skeletal muscular pump, respiratory pump, venomotor tone and systemic filling pressure
how does gravity effect venous pressure
causes blood pulling in the legs and venous collapse in the neck which leads to fainting
how does the skeletal pump effect venous pressure
rhythmic contraction of skeletal muscles causes increased venous pressure
how does respiratory tone effect the venous pressure
when inhaling there is an increase in the pressure gradient increasing venous return
how does the venomotor effect the venous pressure
when contracted the smooth muscle surrounding the veins mobilizes the vein and increases venous return
how does systemic filling pressure effect venous pressure
pressure created by the ventricles increases venous return
