Types, Structure And Function Of Blood Vessels Flashcards
Arteries carry blood in which direction (relating to the heart)
Away from the heart
Which artery actually carries blood to the heart instead of away
The pulmonary ateries
What are the pulmonary arteries rich in containing
Oxygen-rich blood
What do artery walls contain
Several layers of thick elastic fibres and muscle
Which is the largest artery
The aorta
The aorta’s thick elastic walls deal with what
The surge of blood leaving the heart
As blood enters the arteries, what do they do to maintain the flow of blood
Expand and recoil
What is the pulse we detect in the neck or wrist (where large arteries are close to the surface)
The arteries expanding and recoiling
Arteries branch into smaller distributive arteries, what do these eventually become
Arterioles
Arterioles are very small arteries that lead to what
Capillary beds in the tissues
Distributive arteries have muscular walls so that what
They can regulate blood flow to where it is needed
Arteries take blood with oxygen and nutrients to what
Capillary beds
There are masses of interconnected capillaries that surround and interweave between what
Cells and tissues
A capillary is a microscopic tube with walls of how many cells thick
One cell thick
What are the capillaries covered with
A sieve-like basement membrane
Capillaries supply the tissues with oxygen and nutrients whilst removing what
Waste products such as carbon dioxide
Plasma leaves the capillaries and enters small blood vessels known as what
Venules
Venules join together to form what
Larger tubes or veins
Veins have large internal what
Diameters or lumens
The walls of a vein are different to arteries, how is this
They are much thinner and contain less muscle and elastic tissue
With the exception of the pulmonary veins, veins carry deoxygenated blood back to the heart
Because of the low pressure of blood in the veins, where are they often burried
Between our body muscles, so that movements of the body help squeeze blood along
To ensure blood flows in the right direction, veins have valves throughout their length - what is the technical term for this
Preventing backflow
Blockages in the veins cause what
Varicose veins
