Histology

Question 1

Arterioles

Answer 1

• No tunica adventia
• No internal elastic lamin
• only a few smooth muscle layers. in the tunica media
• rich sympathetic flow to control flow of blood

Question 2

Capillaries

Answer 2

Only Tunica intima

-PERICYCTES: found in the BM of the tunica intima-

Question 3

What are pericytes

Answer 3

• Found in the capillaries
• Are an incomplete layer of cells which complete the BM
• Have contractile properties so can control the flow of blood into the tissues

Question 4

Layers of the blood vessels

Answer 4

Tunica intima : simple squamous + BM +connective
Tunica media
Tunica adventia : simple squamous + BM + connective

Question 5

Differences between the tunica media of elastic and muscular arteries

Answer 5

Elastic arteries: have laminae of elastic fibres- squiggly
Muscular arteries : have lots of smooth muscle
Have an internal elastic lamina under the tunica intima and an external elastic lamina between the tunica media and adventia

Question 6

Layers of the veins

Answer 6

Tunica intima- very thin
Tunica media- thin or absent
Tunica adventia- collagen tissue

Question 7

Differences between superficial and deep veins

Answer 7

Superficial- thick wall with no surrounding support

Deep- thin with surrounding support from fascia and muscle

Question 8

what makes up the valves

Answer 8

the tunica intima