BIOS 255 Exam 2
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BIOS 255 Exam 2
- outer layer of a blood vessel, contains epithelial cells, connective tissue, and elastic fiber
Answer
Answer: tunica externa
- the middle and thickest layer of the blood vessel, contains elastic fibers and smooth muscle
Answer: tunica media
- tunica media
Answer: usually the largest layer of a blood vessel and controls the diameter
- the innermost layer of a blood vessel, contains endothelial cells and connective tissue
Answer: tunica intima
- largest arteries by diameter, contain more elastic fibers than smooth muscle
Answer: elastic/ conducting arteries
- contain large amounts of smooth muscle
Answer: muscular/ distributing arteries
- smallest arteries by diameter, attached to the capillary beds
Answer: resistance arteries/ arterioles
- weak point in the wall of a blood vessel, bulging sac that pulsates with each heartbeat
Answer: aneurysm
- tight junctions, creating a continuous and uninterrupted lining, small gaps for exchange of
gases via simple diffusion
Answer: continuous capillaries
- contains pores fenestrations; allows for slightly larger molecules to filter; found in places
like the kidney
Answer: fenestrated capillaries
- large openings allow the passage of larger molecules such as proteins and formed elements;
found in the liver
Answer: sinusoidal capillaries
- contain valves, rely on venules, medium sized veins, and large veins to create pressure to
assist in returning blood to the heart, carry deoxygenated blood
Answer: veins
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