Blood Vessels Flashcards

1
Q

Arteries - what is Adventitia?

A

Provides structural strength and tethers the vessels in place. In large vessels the adventitia contains small blood vessels, the vaso vasorum (vessel of vessels)

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2
Q

Arteries - what is Elastin?

A

Gives vessels mechanical strength and their elastic properties (expand and recoil)

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3
Q

Arteries - what is Endothelium?

A

The endothelial layer is the filtering interface between the blood and the body. It also secretes various vasoactive products.

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4
Q

Arteries - what does Smooth Muscle do?

A

Supplies vessels with contractile power and regulates the diameter of the lumen.

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5
Q

Arteries - what does the Pre-capillary sphincter do?

A

Controls blood flow to specific capillary beds selectively

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6
Q

What is ‘active hyperaemia’?

A

The increase in blood flow according to the metabolic need of the tissue in question

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7
Q

What is flow autoregulation?

A

It is concerned with the maintenance of blood flow rather than changing it. When the driving pressure drops the vessels dilate, when it increases vessels constrict

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8
Q

Is the parasympathetic system involved in the regulation of arteriole pressure?

A

No - there is almost no involvement of the parasympathetic system so relaxation of arteries can happen by withdrawal of sympathetic stimulation.

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9
Q

Is the velocity of flow in capillaries HIGH or LOW?

A

Low

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10
Q

What is the main difference between lymph composition to plasma?

A

Lymph composition has a lower protein content.

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11
Q

What is Oedema?

A

The accumulation of excess fluid in the interstitial spaces (subcutaneous, abdomen, lungs)

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