Circulatory System, Lymphoid Tissue Flashcards
what is a part of the blood vascular system?
heart, arteries, capillaries, veins
what are arteries?
series of efferent vessels that become smaller as they branch and deliver nutrients and oxygen to the tissues via the blood
what are capillaries?
smallest blood vessels, allows interchange between blood and tissues
what are veins?
convergence of capillaries, bring blood back to heart
where does the lymphatic vascular system begin?
lymphatic capillaries that form vessels of increasing size
where does the lymphatic vascular system terminate?
blood vascular system, emptying into large veins near the heart; returning fluid from tissue back to blood
what lines blood and lymphatic vessels?
simple squamous epithelium; endothelium
what are the three types of capillaries?
continuous, fenestrated, discontinuous
where are continuous capillaries found?
muscle, lung and CNS
what kind of junctions connect continuous capillaries?
tight junctions
what surrounds continuous capillaries?
continuous basal lamina
what do pericytes do?
repair damaged capillaries (form components of new blood vessels and connective tissue)
where are pericytes derived from?
mesenchymal cells
where are fenestrated capillaries found?
sites that require rapid exchange of substances between tissues and blood
what are fenestrations?
pores that increase rate of interchange of substances between lumen of capillary and surrounding tissues
