HSF II Vascular System Histology

Question 1

blood vascular system consists of

Answer 1

heart and blood vessels

Question 2

heart

folded endothelial tube

Answer 2

endocardium -> endothelium/ subendothelial CT
myocardium -> syncytium
epicardium -> visceral fibrous pericardium

Question 3

three myocardium muscles

Answer 3

atrial, ventricular, specialized excit/conduct for muscle fibers

Question 4

endocardium

Answer 4

endothelium
BM of CT
middle: smooth muscle+elastic ct
subendocardial with purkinje muscle fibers for heart impulse

Question 5

elastic arteries

Answer 5

lots of elastic tissue in tunica media
maintain BP between sys/diastole
TM thicket
has IEL + EEL

distend in sys/ recoil in diastole

fenestrated elastic sheaths in media, smooth muscle bundles permeating narrow gaps between elastic lamellae

Question 6

muscular arteries

Answer 6

2-10 mm
more smooth muscle and less elastin in TM
TM thickest
IEL is distinct, EEL sometimes

Question 7

arterioles

Answer 7

IEL not obvious
major determinants of BP by vasoconstriction/dilation
circular smooth muscle
partial tone (contraction degree)

Question 8

venous system

Answer 8

tunica media smaller than in arteries
smooth muscle more irregular

have valves

capacitance/reservoir vessels due to distensibility of wall of vessels

Question 9

foam cells

Answer 9

attempt to resorb cholesterol/fatty patch in damaged walls, but end up secreting things to form a plaque -> when die just leads to more inflammation

Question 10

atherosclerosis disease process

Answer 10

tm smooth muscle, fibrous CT –> necrosis, secondary CALCIFICATION = hypertension

Question 11

plaque breaks leads to

Answer 11

clotting cascade leads to thrombus leads to embolus leads to occlusion leads to anoxia and angina

Question 12

plaque narrowing aka

Answer 12

stenosis

Question 13

lymphatic vessels conduct

Answer 13

immune cells lymph EC and chylomicrons

Question 14

lymph node

Answer 14

filter substances with antigenic sampling, recognition, AB production

asymmetrical in tumor metastasis

lack blood, smooth

Question 15

lymphangions

Answer 15

successive lymph valves

Question 16

chylous ascites

Answer 16

increased fat chyle mbuild up bc of lymphatic vessel damage

Question 17

elephantiasis because of

Answer 17

parasitic infection or mosquite bites