Exam (elaborations)
BIOL 431 Unit 1 Ch 19 Blood Vessels Exam Questions with Complete Solutions
- Course
- Institution
BIOL 431 Unit 1 Ch 19 Blood Vessels Exam Questions with Complete Solutions
[Show more]
Content preview
BIOL 431 Unit 1 Ch 19 Blood VesselsExam Questions with Complete
Solutions
tunics - Answer-layers of vessel walls surrounding the lumen
tunica intima - Answer-the innermost layer of a blood vessel, composed of a single layer
of squamous epithelial cells over a sheet of connective tissue; its smooth, frictionless
surface allows blood to flow smoothly through the vessel
tunica media - Answer-The middle layer of blood vessel wall, composed of elastic tissue
and smooth muscle cells that allow the vessel to expand or contract
tunica externa - Answer-outer layer of a blood vessel made of areolar connective tissue
with elastic and collagen fibers; anchor vessel to other structures.
vasa vasorum - Answer-small vessels that supply blood to larger vessels
companion vessels - Answer-arteries and veins that supply the same body region and
tend to lie next to one another
Artery structure - Answer-Arteries have a thick tunica media, a narrower lumen, and
more elastic and collagen fibers than veins
vein structure - Answer-Veins have a thicker tunica externa, a larger lumen, and less
elastic and collagen fibers than arteries and collapse when cut.
capillary structure - Answer-only contain tunica intima of endothelium and underlying
basement membrane; no subendothelial layer
Elastic arteries - Answer-largest, aka conducting arteries (conduct blood from heart to
muscular arteries), stretch & recoil to propel blood
Muscular arteries - Answer-1 to 0.3 mm diameter; aka distributing arteries (distribute
blood to specific body regions/organs); 2 layers (internal & external elastic lamina)
Arterioles - Answer-0.3 to 10µm diameter; tunic layer range from all 3 to just 1; often
has vasomotor tone
vasomotor tone - Answer-arterioles in a state of partial contraction; significant role in
maintaining blood pressure.
, Atherosclerosis - Answer-condition when plaque build up on the inner walls of the
arteries; characterized by the presence of an atheroma
atheroma - Answer-a deposit of plaque on or within the arterial wall; leads to thickening
of the tunica intima and narrowing of the arterial lumen
Angioplasty - Answer-treatment for atherosclerosis in which a wire-mesh stent is placed
in the vessel with a balloon-tip catheter to hold the vessel open
Aneurysm - Answer-ballooning of a weakened portion of an arterial wall
Continuous capillaries - Answer-most common; intercellular cleft b/t cells for gas to pass
through; in muscle, skin, lungs, and the central nervous system.
Fenestrated capillaries - Answer-have fenestration in vessel wall (allow exchange of
small proteins); found in kidneys, intestines, and endocrine glands
Sinusoids/discontinuous capillaries - Answer-largest openings; allow exchange of large
substances b/t blood & tissues (formed elements, large plasma proteins, etc)
Capillary beds - Answer-groups of capillaries functioning together; fed by metarteriole;
made by true capillaries
precapillary sphincter - Answer-band of smooth muscle that adjusts the blood flow into
each capillary
When the precapillary sphincter contracts - Answer-blood flows directly from the
metarteriole into the thoroughfare channel to the postcapillary venule and bypasses the
capillary bed
Perfusion - Answer-volume of blood flowing through certain mass of tissue per unit time.
Venules - Answer-smallest veins; 8-100 µm in diameter; companion vessels with
arterioles.v
vein - Answer-has diameter of at least 100 µm; Small- and medium-sized veins are
companion vessels with muscular arteries, while the largest veins are companion
vessels of the elastic arteries; both are named veins.
simple pathway of blood vessels - Answer-one major artery/capillary bed/vein delivers
blood to organ or region
Alternative pathway of blood vessel - Answer-include various types of anastomoses and
portal systems
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller lectknancy. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
48756 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 15 years now