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Unit 2 KA5 - Structure & Function of Arteries, Capillaries & Veins

Where does Blood flow through the cardiovascular system?

It circulates from the heart through the arteries to the capillaries to the veins and back to the heart

When is there a decrease in blood pressure?

When the blood moves away from the heart

The lumen (central cavity) of a blood vessel is lined with a think layer of...called the...

epithelial cells
endothelium

Arteries have an outer layer of connective tissue containing what?

Elastic fibres

Arteries have a middle layer containing what?

smooth muscle with more elastic fibres

The elastic walls of the arteries... and... accomodating the surge of blood after each contraction of the heart

Stretch and recoil

To control blood flow the smooth muscle fible surrounding arteries can contract causing

vasoconstriction

To control blood flow the smooth muscle fible surrounding arteries can relax causing

vasodilation

Capillaries allow...

Exchange of substances with tossue througj their thin walls

Veins have an...

outer layer of connective tissue containing elastic fibres

Veins have a... muscular wall compared to arteries

thinner

Veins contain valves to...

prevent the backflow of blood

What does pressure filtration cause?

Plasma to pass through the capillary walla into the tossue fluid surrounding the cells

Tissue fluid and what are similar in composition?

blood plasma with the exception of plasma proteins

Why arent plasma proteins similar?

they are too large to be filtered through the capillary walls

Tissue fluid supplies cells with

glucose, oxygen and other substances

Carbon dioxide and other metabolic wastes...

diffuse out of the cells and into the tissue fluid to be excreted

Where does most of the tissue fluid return to?

the blood

excess tissue fluid is absorbed by...

thin walled lymphatic vessels

This lymph fluid is returned to the...

circulatory system

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