Physiology - Veins and lymphatics Flashcards
which vessels store blood and mobilise when required?
a. conduit
b. capacitance
b.capacitance
which vessels act as passageway back to the heart?
a. conduit
b. capacitance
a.conduit
which statement is correct?
s. velocity is directly proportional to total cross sectional area
b. velocity is proportional to cross sectional area
c. velocity is inversely proportional to total cross sectional area
c. velocity is inversely proportional to total cross sectional area
what best describes venous return?
a. volume of blood returning to heart from peripheries
b. volume of blood returning to the heart from systemic veins
c. volume of blood returning to the heart from the lungs
d. volume of blood returning to the heart from the SVC
b.volume of blood returning to the heart from systemic veins
venous resistance and which other factor determines venous return?
a. total cross sectional area
b. flow rate
c. volume gradient
d. pressure gradient
d.pressure gradient
what effect does cardiac suction have on the pressure in the heart?
a. increase
b. decrease
b.decrease
does venous tone increase or decrease venous pressure?
a. increase
b. decrease
a.increase
what effect does the respiratory pump have on venous pressure ?
a. increase
b. decrease
b.decrease
stimulation by which system increases venous tone?
a. parasympathetic
b. autonomic
c. sympathetic
c.sympathetic
tone = venoconstriction
when venous stretch receptors are activated what is the response?
a. increase venous smooth muscle tone
b. decrease venous smooth muscle tone
c. venodilatation
d. increase venous cardiac muscle tone
a.increase venous smooth muscle tone
which two hormones lead to venoconstriction?
a. noradrenaline and choline
b. adrenaline and choline
c. adrenaline and noradrenaline
c. adrenaline and noradrenaline
what is the correct equation for compliance?
a. change in volume/ change in pressure
b. change in pressure/ change in volume
c. stroke volume x heart rate
a.change in volume/ change in pressure
true or flase veins have a low vascular compliance?
a. true
b. false
b.false
which is the largest blood resevoir of the venous system? (2 choices)
a. spleen
b. large abdominal veins
c. venous plexus
d. liver
c. venous plexus
d. liver
other than pressure generated by the heart what else contributes to venous pressure?
a. osmotic pressure
b. hydrostatic pressure
c. oncotic pressure
d. arterial pressure
b.hydrostatic pressure
where is central venous pressure located ?
a. thoracic vena cava near right atrium
b,thoracic vena cava near right ventricle
c. superior vena cava near right atrium
d. pulmonary vein near left atrium
a. thoracic vena cava near right atrium
other than venous return what does central venous pressure depend on?
a. venous hydrostatic pressure
b. left ventricular function
c. right ventricular function
d. venous oncotic pressure
c. right ventricular function
which of these is the correct value for normal right atrial pressure?
a.55mmHg
b0-5 mmHg
c. 10-20 mmHg
d. 20-30 mmHg
b0-5 mmHg
which of these conditions causes right atrial pressure to rise to 10-30 mmHg?
a. vigorous heart pumping post haemorrhage
b. heart failure /large transfusion
b. heart failure /large transfusion
which of these conditions causes right atrial pressure to rise to -3 - -5 mmHg?
a. vigorous heart pumping post haemorrhage
b. heart failure /large transfusion
a.vigorous heart pumping post haemorrhage
which of these is not found in the lymph?
a. proteins
b. white blood cells
c. lipids
d. carbohydrates
d.carbohydrates
absorption of which substance happens via the lymphatic system?
a. iron
b. sodium
c. fat
d. potassium
c.fat
which best describes the role of the lymphatic system?
a. returns plasma to blood
b. returns extracellular fluid to blood
c. returns interstitial fluid to the blood
d. returns intracellular fluid to the blood
c.returns interstitial fluid to the blood
