Heart Flashcards
artery and vein inner layer
-tunica interna (or intima)
-endothelium (simple squamous epithelium)
-thing layer of loose connective tissue
-inner elastic membrane (arteries only)
artery and vein middle layer
-tunica media
-circularly arranged smooth muscle cells
-some elastic collagen fibers
-external elastic membrane (large arteries olny)
artery and vein outer structure
-tunica adventitia (or externa)
-loose connective tissue (collagen and elastic fibers
arteries, veins, capillaries pressure
high, low, low
arteries, veins, capillaries function
send blood from heart, send blood to heart, material exchange with tissue
arteries, veins, capillaries lumen diameter
narrow, wide, extremely narrow (one cell wide)
arteries, veins, capillaries wall thickness
thick, thin, extremely thin (single cell thick)
arteries, veins, capillaries wall layers
A and V- three: tunica adventitia, tunica media, tunica intima
C- one: trunca
arteries, veins, capillaries muscle and elastic fibers
large amounts, small amounts, none
arteries, veins, capillaries valves
no, yes, no
three layers of the heart structure
-endocardium
-myocardium
-epicardium
endocardium
-lines chambers
-endothelium supported by dense irregular CT (deep facia)
-continuous with tunica intima of great vessels entering and leaving heart
myocardium
muscle layer
epicardium
-covers surface of heart
-mesothelium supported by loose CT
-mesothelium= simple, typically squamous epithelium
-epicardium= visceral layer of serous pericardium
pericardium make up
-layers of serous pericardium- visceral and parietal-enclose the fluid-filled pericardial cavity
-serous pericardial layers are continuous
-serous pericardial layer (mem) or pericardial serosa=mesothelium supported by a thin layer of loose CT
-parietal serous pericardium fused to fibrous pericardium
-fibrous pericardium= thick layer of collagen fiber bundles and elastic fibers (dense irregular CT)
pericardium functions
-serous fluid in cavity lubricates heart to allow near frictionless movement
-prevents overfilling of heart
-protects heart against infection and blunt trama
-pericardium and associated ligaments hold heart in place
electrical system of the heart
-transmits electrical signals generated by SA node to cause heart muscle contraction
-comprised of specialized cardiac muscle cell
-sinoatrial node
-atrioventricular node
-right and left bundle of his
-Purkinje fibers
why are some tissues in the heart white
because they are all about conducting signals
