Blood Vessels Flashcards
What type of circulatory system do humans have
Closed Circulatory system
Name the five main types of blood vessels
Arteries Arterioles Capillaries Venules Veins
What is the flow chart of blood through the vessels
Heart -> Artery -> Arteriole -> Capillary -> Venule -> Vein -> Heart
What do Arteries do
Carry blood AWAY from the heart to other organs
What level of pressure is the blood in arteries
High pressure
How do arteries manage high blood pressure
The walls of the arteries are very thick and elastic
What is the main artery
The aorta
What are arterioles
The smallest arteries in the body
What do arterioles do
They deliver blood to capillaries
How do arterioles control how much blood enters the capillaries
The are capable of constricting or dilating
What are capillaries
Very thin tubes that join the arteries with the veins
How thick of capillaries
Only 1 cell thick
Why are capillaries important
This is where gaseous exchange occurs
What gaseous exchange occurs in the capillaries
Oxygen and nutrients diffuse out of the capillaries into the tissue cells
What are Venules
Group of capillaries within a tissue that reunite to form a small vein called a venule
What do Venules do
Collect blood from capillaries and drain it into veins
What do Veins do
Carry blood which contains a large amount of carbon dioxide (deoxygenated) back to your heart
Do Veins have thinner or thicker walls than arteries and why is this
They have thinner walls than arteries as the blood is not moving at such a high pressure
Why do veins have valves
Due to the low pressure, veins have valves to stop the blood from flowing away from the heart
What are the principal veins
The venae cavae
What are arteries layer of muscles and elastic fibers described as
They have a thick layer of muscles and elastic fibers
What are veins layer of muscles and elastic fibers described as
They have a thin layer of muscles and elastic fibers
Do capillaries have muscles and elastic fibers
No
Describe Arteries lumen
Narrow
Describe Veins’ lumen
Wide
Describe Capillaries lumen
Very small
How thick is the wall of arteries
Thick outer wall
How thick is the wall of veins
Thin outer wall
How thick is the wall of capillaries
Only one cell
Do arteries have semi lunar valves
No
Do veins have semi lunar valves
Yes
Do capillaries have semi lunar valves
No
Where are arteries found
Deep into the body surface
Where are veins found
Near the body surface
Where are capillaries found
Inside all tissues
Where does blood flow in arteries
From the heart to the body
Where does blood flow in veins
Back to the heart
What oxygen concentration is the blood in arteries
Oxygenated (except pulmonary artery)
What oxygen concentration is the blood in veins
Deoxygenated (Except pulmonary veins)
What pressure is the blood in arteries
High
What pressure is the blood in veins
Low
