chapter 21 pt 2- blood vessels Flashcards
blood pressure
measure the force blood exerts against BV walls via auscultation
mercury manometer
used to measure BP in mmHg, measure via auscultation
sphygmomanometer
BP cuff, stethoscope over brachial artery
compliance
tendency for blood vessel volume to increase concurrent with BP increases
do vessels have greater or less compliance?
greater- stretches more easily
vessels with large compliance have less or greater volume?
greater volume
how much greater is venous compliance than arterial
about 24x
what do veins act as for blood
storage reservoirs, hold 64% of BV
pulse
pressure wave as blood ejected from LV into aorta - travels quickly along the srteries, 15x greater in aorta
does pulse determine HR
yes, if in rhythm
H&N
common carotid artery (neck), superficial temporal artery, facial
where can you find pulse in arm
axilary artery, brachial, radial
where can you find pulse in the leg
moral artery, popliteal, postural tibial, dorsalis pedis
what is pulse generated by
pulse pressure- differece between systolic and diastolic pressures
what is pulse pressure influenced by?
stroke volume and vascular compliance
inverse relationship with vascular compliance
arterial bp
depends on how much the elastic arteries can stretch (compliance) and volume of blood forced into elastic arteries at any time
pulsatile
not constant arterial bp - correlates w LV
capillary bp
bp drops to 35 mmHg at beginning of capillaries at 17 mmHg at ends of capillary beds
venous bp
steady pressure w little change
3 functional adaptation
- muscular pump
- respiratory pump
- sympathetic venoconstriction
