Factors Affecting Blood Flow Flashcards

1
Q

What two things determine the flow of blood in vessels?

A

Pressure gradient

Resistance

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2
Q

How is flow affected as branching occurs down the arterial tree?

A

Resistance increases so flow decreases

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3
Q

What systems will aid venous return?

A

Valves in the veins
Respiratory movements
Movements of skeletal muscles surrounding veins acting as pump
Constriction of veins by sympathetic nervous system

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4
Q

What is preload?

A

Venous return to the right ventricle

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5
Q

What effect does the drug nitro-glycerine have on the heart?

A

Reduces preload

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6
Q

How do nitrates work to reduce preload?

A

They cause vasodilation which reduces central venous pressure

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