Structure And Function Of The Heart Flashcards
Where does blood from the heart circulate through
Blood vessels
In blood vessels what is the central space called
The lumen and it’s lined with cells called the endothelium
What’s the function of arteries
They carry blood round at at a high pressure
What’s the smallest artery
Arterioles
What’s characteristics of arterys
Thick walls, narrow lumen, elastic fibres
If arterys need to carry more blood what happens
Vasodilation
Why does arterys have elastic fibres
When heart contracts a surge of blood flows through at a high pressure so it can stretch and not burst
Function of veins
To carry blood back to the heart
What’s he smallest vein
Venule that remove noood from capillaries
What are some characteristics of veins
Carry a low blood pressure, wide endothelium
What is the function of capillaries
Allow exchange of substances carried through the blood
What are some characteristics of the capillaries
Think walls and very narrow lumen
Where do capillaries occur
In networks called capillary beds
What does high pressure in capillary beds cause
Ateriole blood pressure filtration leading to capillaries exuding plasma this is because tissue find which bathes are cells tissue fluid them to exchange markers with the cells and return to cappilries by osmosis and diffusion
What is the function of lymph vessels
More fluid passes out of the capillaries due to pressure filtration then diffuses back to osmosis and diffusion
