Blood Flow & Blood Pressure Quiz

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Know how flow and pressure are controlled

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JoNya Luckey

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Blood Flow & Blood Pressure Quiz


Blood Flow & Blood Pressure QuizVersión en línea Know how flow and pressure are controlled por JoNya Luckey 1 What is the main site of variable resistance in the circulation? a Veins b Capillaries c Arterioles d Arteries 2 Which neurotransmitter binds to alpha receptors to cause vasoconstriction? a Norepinephrine b Acetylcholine c Dopamine d Epinephrine 3 State Poiseuille’s law for blood flow in a vessel. a Flow = ΔP / R b Flow = (ΔP) π r^4 / (8 η L) c Flow = ΔP · r^2 / (η L) d Flow = (ΔP) / (8 η) r^4 L 4 What does MAP stand for in cardiovascular physiology? a Muscle arterial pressure b Mean alveolar pressure c Mean arterial pressure d Maximum arterial pressure 5 If the radius of an arteriole increases, what happens to its resistance? a Resistance first increases then decreases b Resistance decreases c No change in resistance d Resistance increases 6 Which factor best explains how blood flow is distributed to different organs? a Mean arterial pressure b Venous return c Cardiac output d Local metabolic needs (local control) 7 Where are arterial baroreceptors primarily located? a Vena cava b Carotid arteries and aortic arch c Pulmonary artery d Coronary arteries 8 Which hormone increases sodium reabsorption in the distal nephron? a Aldosterone b Angiotensin II c Atrial natriuretic peptide d Vasopressin 9 How does doubling the radius of a vessel affect flow, assuming other factors constant? a Flow decreases by 4 times b Flow stays the same c Flow doubles d Flow increases 16-fold 10 What is the primary role of vascular smooth muscle in arterioles? a To absorb nutrients b To regulate diameter and thus resistance c To exchange gases d To transport blood Feedback 1 Arterioles are the primary resistance vessels, adjusting flow by changing radius. 2 NE acts on α receptors causing constriction; epinephrine can also bind α at higher affinity. 3 Flow is proportional to pressure difference and radius to the fourth power. 4 MAP is the driving pressure for blood flow in the systemic circulation. 5 Resistance ∝ 1/r^4; larger radius greatly lowers resistance. 6 Distribution follows tissue metabolic demand and local autoregulation. 7 Baroreceptors are located in the carotid sinuses and aortic arch. 8 Aldosterone promotes Na+ reabsorption and K+ secretion; ANP opposes this. 9 Flow ∝ r^4, so doubling r increases flow by 2^4 = 16. 10 Arteriolar smooth muscle controls diameter for resistance and flow regulation.

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Blood Flow & Blood Pressure Quiz

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Blood Flow & Blood Pressure QuizVersión en línea

por JoNya Luckey

What is the main site of variable resistance in the circulation?

Which neurotransmitter binds to alpha receptors to cause vasoconstriction?

State Poiseuille’s law for blood flow in a vessel.

What does MAP stand for in cardiovascular physiology?

If the radius of an arteriole increases, what happens to its resistance?

Which factor best explains how blood flow is distributed to different organs?

Where are arterial baroreceptors primarily located?

Which hormone increases sodium reabsorption in the distal nephron?

How does doubling the radius of a vessel affect flow, assuming other factors constant?

What is the primary role of vascular smooth muscle in arterioles?

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