BIOS 255 EXAM 2 QUESTIONS - CHAMBERLAIN
Which form of membrane movement is ideal for the diffusion of gases? - Answers
:simple diffusion
Which major category of tissues is ideal for lining and covering structures? - Answers
:epithelial tissue
Tunica Intimia (interna) consists of - Answers :endothelial cells, connective tissue
tunica media consists of - Answers :elastic fibers and smooth muscle
tunica externa consists of - Answers :epithelial cells, connective tissue, elastic fibers
which layer is the largest? - Answers :tunica media
why is the tunica media thicker in arteries than veins? - Answers :they supply more
pressure to blood
what are the only blood vessels that contain valves? - Answers :veins and venules
what do valves do? - Answers :prevent back flow of blood
what is an artery - Answers :blood vessels that transports blood AWAY from the heart
and TOWARDS the capillaries
are arteries oxygen rich or oxygen poor? - Answers :oxygen rich
what is a vein? - Answers :vessels that drain blood from the capillaries and transport it
TOWARDS the heart
are veins oxygen rich or oxygen poor? - Answers :oxygen poor
what is a capillary? - Answers :microscopic vessel that allows for the exchange of
substances between blood and tissues
what are capillaries composed of? - Answers :layer of endothelium and a basement
membrane
what are elastic arteries composed of? - Answers :more elastic fibers than smooth
muscle
what do elastic arteries do? - Answers :conduct blood from the heart to distant muscular
arteries
, why do elastic arteries stretch? - Answers :to accommodate blood being ejected from
the ventricle
what do muscular arteries consists of? - Answers :multiple layers of smooth muscle
what do muscular arteries do? - Answers :allow vessels to vasodilate and vasoconstrict
to regulate distribution of blood
what do arterioles do - Answers :deliver blood to the capillaries where nutrient and gas
exchange occur
what do arterioles consists of - Answers :attached to capillary beds, pre capillary
sphincter
pre capillary sphincter function - Answers :used to control blood flow through the
systemic capillary
arterioles are always under what? and what is it regulated by? - Answers :vasomotor
tone, regulated by vasomotor center of the brainstem
what do continuous capillaries consists of - Answers :endothelial cells that encircle
lumen, filtration cleft, systemic capillaries
what is the function of continuous capillaries? - Answers :move small nutrients and
waste through simple diffusion
diffusion and bulk flow endocytosis
where are continuous capillaries found? - Answers :muscles and skin
what do fenestrated capillaries consists of? - Answers :fenestration (windows), pores,
filtration cleft
what is the function of fenestrated capillaries? - Answers :allow more capillary exchange
and slightly larger molecules to be absorbed and filtered out of capillaries
where are fenestrated capillaries found? - Answers :small intestine and kidneys
what do sinusoidal capillaries consists of? - Answers :endothelial cells that dont encircle
lumen, large filtration pores
what is the function of sinusoidal capillaries? - Answers :move large substances
where are sinusoidal capillaries found? - Answers :liver, red bone marrow, spleen,
endocrine glands
Which form of membrane movement is ideal for the diffusion of gases? - Answers
:simple diffusion
Which major category of tissues is ideal for lining and covering structures? - Answers
:epithelial tissue
Tunica Intimia (interna) consists of - Answers :endothelial cells, connective tissue
tunica media consists of - Answers :elastic fibers and smooth muscle
tunica externa consists of - Answers :epithelial cells, connective tissue, elastic fibers
which layer is the largest? - Answers :tunica media
why is the tunica media thicker in arteries than veins? - Answers :they supply more
pressure to blood
what are the only blood vessels that contain valves? - Answers :veins and venules
what do valves do? - Answers :prevent back flow of blood
what is an artery - Answers :blood vessels that transports blood AWAY from the heart
and TOWARDS the capillaries
are arteries oxygen rich or oxygen poor? - Answers :oxygen rich
what is a vein? - Answers :vessels that drain blood from the capillaries and transport it
TOWARDS the heart
are veins oxygen rich or oxygen poor? - Answers :oxygen poor
what is a capillary? - Answers :microscopic vessel that allows for the exchange of
substances between blood and tissues
what are capillaries composed of? - Answers :layer of endothelium and a basement
membrane
what are elastic arteries composed of? - Answers :more elastic fibers than smooth
muscle
what do elastic arteries do? - Answers :conduct blood from the heart to distant muscular
arteries
, why do elastic arteries stretch? - Answers :to accommodate blood being ejected from
the ventricle
what do muscular arteries consists of? - Answers :multiple layers of smooth muscle
what do muscular arteries do? - Answers :allow vessels to vasodilate and vasoconstrict
to regulate distribution of blood
what do arterioles do - Answers :deliver blood to the capillaries where nutrient and gas
exchange occur
what do arterioles consists of - Answers :attached to capillary beds, pre capillary
sphincter
pre capillary sphincter function - Answers :used to control blood flow through the
systemic capillary
arterioles are always under what? and what is it regulated by? - Answers :vasomotor
tone, regulated by vasomotor center of the brainstem
what do continuous capillaries consists of - Answers :endothelial cells that encircle
lumen, filtration cleft, systemic capillaries
what is the function of continuous capillaries? - Answers :move small nutrients and
waste through simple diffusion
diffusion and bulk flow endocytosis
where are continuous capillaries found? - Answers :muscles and skin
what do fenestrated capillaries consists of? - Answers :fenestration (windows), pores,
filtration cleft
what is the function of fenestrated capillaries? - Answers :allow more capillary exchange
and slightly larger molecules to be absorbed and filtered out of capillaries
where are fenestrated capillaries found? - Answers :small intestine and kidneys
what do sinusoidal capillaries consists of? - Answers :endothelial cells that dont encircle
lumen, large filtration pores
what is the function of sinusoidal capillaries? - Answers :move large substances
where are sinusoidal capillaries found? - Answers :liver, red bone marrow, spleen,
endocrine glands
