the anatomy of the vessels Flashcards

1
Q

what are there 3 main layers that both arteries and veins have

A
  • adventitia
  • media
  • intima
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2
Q

what is the internal elastic lamina like in veins

A

the internal elastic lamian is extremely thin in veins and is not easily visualised

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3
Q

what are all blood vessels lined with

A
  • lined with an endothelium

- not lined with a basement membrane

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4
Q

what is the tunica media thicker in the artery or the vein

A

artery

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5
Q

what is the tunica media primary made of

A

smooth muscle

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6
Q

what blood vessel contains valves

A

veins

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7
Q

what do arteries and veins do

A

arteries carry blood away from the heart

veins carry blood towards the heart

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8
Q

do arteries always carry oxygenated blood

A

no

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9
Q

what innervates the smooth muscle of arteries and arterioles

A

sympathetic nervous system not the parasympathetic onerous system

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10
Q

what does sympathetic innervation of most blood vessels cause

A

vasoconstriction

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11
Q

which vessels constrict with sympathetic innervation and why

A

small arterioles and arteries constrict the most to control the distribution of blood

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12
Q

describe the pathway of blood through the vascular system

A
  • conducting artery
  • muscular artery
  • arteriole
  • capillaries
  • venues
  • veins
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13
Q

where are precapillary sphincters located

A

they are located at the end of the capillary bed

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14
Q

what do precapillary sphincters do

A

they control blood flow through the capillary bed or through the shunt

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15
Q
through where (capillary bed or shunt would must blood be flowing if you were 
a, lying in bed 
b, in a gym doing squats
A

A= shunt

B - capillary bed

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