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describe the pathway of the blood
heart to arteries to arterioles to capillaries to venules to veins to heart
name the characteristics of the tunica media
dominated by smooth muscle and dominated by elastic fibers
true or false: the contractility arteries is under the control of the parasympathetic nervous system
false; sympathetic nervous system
list the characteristics of the fenestrated capillaries
have pores that penetrate endothelial lining and permit water and large solutes as large as small peptides
list the characteristics of continuous capillaries
permit diffusion of water, small solutes, and lipid-soluble materials; prevent loss of blood cells and plasma proteins
what is the main function of sinusoidal capillaries?
allows plasma proteins produced by liver to enter the bloodstream
true or false: your body has more than enough blood to maintain blood flow through all capillaries at all times
false, it only has enough blood for about 25% of it
what controls when precapillary sphincters constrict or relax?
the local environment, specifically a drop in oxygen levels
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