circulatory system histo Flashcards Preview

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Flashcards in circulatory system histo Deck (22):
1

Hollow organs possessing a lumen

blood vessels

2

Walls of blood vesselspossess three coats:

Inner coat lined by endothelium
Middle muscular coat
Outermost fibrous coat

3

Arteries have prominent ------ coat
Veins have prominent ----- coat

middle
fibrous

4

Diameter between 7-9 um
Found in all tissue except mucus, connective tissue, cartilage, bone and epithelium
Single layer of endothelial cells
Pericytes as perivascular cells
External surface resting on basal lamina of collagen fibers

capillaries

5

functions of capillaries

1. Selective permeability
Intercellular junctions
Fenestrae and pinocytic vesicles
Blood brain barrier and other barriers

2. Metabolic
3. Non-thrombogenic

6

types of capillaries

With uninterrupted endothelium and basal lamina
Lack fenestrae
Presence of pinocytic vesicles or caveolae intracellulares
Found in muscle tissue, CT, exocrine glands and nervous tissue

1. Continuous/Somatic

7

types of capillaries

Large fenestrae in walls of endothelial cells and continuous basal lamina

fenestrated

8

type of fenestrated/visceral
– fenestrae is 60-80 nm closed by a diaphragm, thin continuous basal lamina;
found in kidney, GIT and endocrine glands

with Diaphragm

9

type of fenestrated/visceral
with very thick basal lamina; seen in renal glomerulus

Without Diaphragm

10

type of fenestrated/visceral
wide lumen; less prominent basal lamina; no intercellular gaps and macrophages; found in endocrine glands, carotid and aortic bodies

Sinusoidal

11

type of artery
Less than 0.5 mm in diameter
Narrow lumen
Tunica intima – endothelial cells with rod shaped granules for blood coagulation and a very thin subendothelial layer
Tunica media – 1-5 layers of smooth muscle cells
Tunica adventitia – very thin w/o external elastic lamina

arterioles

12

type of artery
Tunical intima – lined by endothelial cells; thicker subendothelial layer; prominent internal elastic lamina

Tunica media – up to 40 layers of smooth muscle cells with elastic collagen fibers and proteoglycans

Tunica adventitia – external elastic lamina in large muscular arteries; collagen and elastic fibers, fibroblast, adipose cells, lymphatics, vasa vasorum and nerve

muscular arteries

13

type of vein
Diameter of 0.2- 1 mm
Tunica intima of endothelial cells
Tunica media – 1-2 layers of smooth muscle cells
Tunica adventitia- thickest layer of CT rich in collagenous fibers

venules

14

type of vein
Diameter of 1-9 mm
Tunica intima – endothelial cells with thin to absent subendothelial layer; presence of valves in legs and arms
Tunica media - small bundles of smooth muscle cells mixed with collagenous, elastic and reticular fibers
Tunica adventitia – well developed; rich in collagen fibers; vaso vasorum extends in intima

medium-sized vein

15

kinds of veins

1. Venules
2. Medium sized veins
3. Large veins

16

type of artery
Tunica intima – thicker than muscular artery; endothelial cells are folded or scalloped; subendothelial layer thick with absence of internal elastic lamina

large elastic arteries

17

type of artery
Tunica intima – well developed
Tunica media – thinner with few smooth muscle cells and abundant CT
Tunica adventitia – thickest and well developed

large vein

18

3 layers of heart

endocardium
myocardium
epicardium

19

layer of heart
homologous to t. intima;
made of a singly layer of squamous endothelial cells resting on a thin subendothelial layer of loose CT containing elastic and collagenous fibers and smooth muscle cells;

Endocardium

20

layer of heart
presence of subendocardial layer consisting of veins, nerve and branches of impulse conducting system of the heart (Purkinje fibers)

Endocardium

21

heart layer
thickest of the layer consisting of cardiac muscle cells arranged in spiral manner; grouped into contractive cells and impulse generating and conducting cells

2. Myocardium –

22

heart layer
serous covering of the heart of simple squamous epithelium; with veins, nerve and nerve ganglion

3. Epicardium –

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