Unit 4 Blood Vessels Flashcards
3 blood vessel layers are?
Tunica externa
Tunica media
Tunica interna
What is the % of blood transport is oxygenated?
99%
3 specific attributes of conducting arteries are?
Tunica media is full of collagen and elastin
Expands and stretches to accomodate BP
closest to heart
What are 2 charachteristics of distributing arteries?
Thick Tunica Media w/smooth muscle
Undergo vasoconstriction
What are 3 unique features of Resistance arteries?
Smallest (arterioles)
Primary site for both resistance and regulation of BP
precurser to capillaries
What are the the sympathetic innervation of Blood Vessels?
- Alpha 1- Adrenergic receptors : cause vasoconstriction
- Beta 2 - adrenergic receptors : cause vasodialation
Where does nutrient waste exchange occur?
Capillaries
These substances cross the capillary wall thriugh diffusion.
Lipid soluble substances : O2 & CO2
What substances cross the capillary wall through intracellular clefts or large pores?
Water soluable substances : electrolytes
What is defined by principles that govern blood flow in the cardiovascular system.
Hemodyanamics
What includes the arterioles, capillaries, and venues within the circulatory system?
Microvasculature
What is important in nutrient and waste exchange in the blood flow?
Microcirculation
Where would one find the main storage of blood throughout the body?
Veins - 65% of BV at any given time
What are the functions of the circulatory system?
Nutrient-waste exchange
Thermal regulation
Clotting/healing infections
fluid balance
What classification of artery are arterioles?
Resistant arteries - a lot of vasoconstriction and vasodialation
