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Details

BSTR301
Blood Vessels
11
Anatomy
Not Applicable
05/19/2008

Additional Anatomy Flashcards

 


 

Cards

Term
What are the 3 layers that form the vessel wall?
Definition
  1. tunica intima - lines the sindies of the vessel and is exposed to blood (endothelium + basement membrane)
  2. tunica media - the thickest; smooth muscle + collagen + some elastin
  3. tunica externa - outermost layer, loose connective tissue + vasa vasorum (small vessels)
Term
How does the anatomy of veins and arteries differ? what about capillaries?
Definition
Arteries have more elasticity and veins have valves; capillaries only have ednotehlium and basement membrane
Term
What are the three sensory receptors related to the maintainence of BP and what are their functions?
Definition
  • carotid sinuses - baroreceptors (pressure sensors) that respond t ochanges in blood pressure; have a thin tunica media and many glossopharyngeal nerve fibers. a rise in BP stretches the tunica media and stimulates the nerve fibers; the nerves tranmits signals to vasomotor and cardiac centers of the brainstem, and brainstem responds by lowering HR and dilating vessels
  • carotid bodies - receptors innervated by sensory fibers of the vagus and glossopharyngeal nerves;; chemoreceptors that monitor changes in blood composition and adjust breathing to stabilize blood pH and levels of O2 and CO2
  • aortic bodies - in aortic arch, does the same as carotid bodies
Term
What is an aneurysm? where are they most common?
Definition
  • weak point in an artery or in the heart wall; forms a thin-walled bulging sac that pulsates w/ each beat of the heart and may eventually rupture or cause pain or death by putting pressure on brain tissue, nerves, veins, etc
  • abdomina aorta renal arteries and brain
Term
In a resting adult, is there more blood in the veins or arteries?
Definition
54% to 11%
Term
What is the simplest circulatory pathway? where can this be found?
Definition
  • artery --> cap. bed --> vein
  • found in pulmonary circuit, in lungs
Term
what is a portal system? where can this be found?
Definition
  • artery --> cap. bed --> cap bed --> vein
  • kidneys or b/t hypothalamus and pituitary
Term
where can you find the hepatic portal system?
Definition
b/t intestines and liver
Term
what is an anastomosis? where are arteriovenous anastomoses found?
Definition
  • two veins or arteries merge with each other w/o intervening cap. beds
  • places prone to frostbite
Term
Where can you find arterial anastomoses?
Definition
coronary circulation, joints
Term
Where would you find venous anastomoses?
Definition
drainage from organ; this type of anas. is most common
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