The vasculature Flashcards
What are arterioles?
Control vessels of the circulatory system
What are the 9 main arteries?
Aorta
Carotid
Brachial
Radial
Iliac
Femoral
Gastric
Hepatic
Renal
What are the 7 major veins?
Vena cava
Jugular
Brachial
Basilic
Cephalic
Common iliac
Femoral
What blood enters the arteries?
Oxygenated
What blood is removed by the veins?
De-oxygenated
What do arteries divide into?
Arterioles then capillaries
Capillaries reform into…
Venules then veins
Arteries
Thick, highly elastic walls with high radii that pass from heart to organs
Arterioles
Highly muscular with small radii that determine distribution
Capillaries
Thin walled with large CSA that determine extracellular fluid distribution
Veins
Thin walled with large radii that pass from heart to organs
What do veins and arteries act as?
Blood and pressure reservoirs
What are the different permeabilities of capillaries?
Continuous (less permeable)
Fenestrated (more permeable)
Discontinuous (highly permeable)
What is the unit for blood pressure?
mmHg
What is minimum blood pressure?
80mmHg
When does rate of flow increase?
When the diameter of arteries decreases
Why do arterioles constrict at rest?
Sympathetic tone
When is vasoconstriction caused?
Increase in noradrenaline caused by arteriole diameter change
When does arteriole diameter change?
Changes in sympathetic activity
What causes blood vessels to dilate?
Adrenaline
