Term
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Definition
inner most layer of the heart wall
composed of endothelium (simple squamous) and areolar connective tissue |
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Definition
middle layer of the heart wall
composed of cardiac muscle tissue |
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Definition
forms the external surface of the heart
composed of areolar connective tissue with a mesothelium covering |
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Term
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Definition
double layered fluid filled sac that surrounds the heart
allows from increase and decrease in size |
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Definition
| connect neighboring cardiac muscle cells |
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Definition
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Definition
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Definition
| the period between the start of one heartbeat and the beginning of the next |
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Definition
| responsible for establishing the rate of cardiac contraction |
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Term
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Definition
| distribute the contractile stimulus to the general myocardium |
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Term
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Definition
embedded in the posterior wall of the right atrium near the entrance of the superior vena cava
each time it generates an impulse, it produces a heartbeat |
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Term
| Atrioventricular (AV) Node |
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Definition
sits within the floor of the right atrium
received impulse from SA node is slowed |
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Term
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Definition
| where the impulse travels along the interventricular septum after it reaches the AV node |
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Definition
| convey impulses very rapidly to the contractile cells of the ventricular myocardium |
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Term
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Definition
innermost layer of a blood vessel
includes endothelial lining and underlying layer of connective tissue |
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Term
| Internal Elastic Membrane |
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Definition
| thick layer of elastic fibers in the outer margin of the intima of arteries |
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Term
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Definition
middle layer
contains sheets of smooth muscle in a framework of loose connective tissue |
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Term
| External Elastic Membrane |
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Definition
| thin band of elastic fibers in the outer margin of the media of arteries |
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Term
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Definition
forms a collagen and elastic connective tissue sheath around a blood vessel
stabilizes and anchors the blood vessel |
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Term
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Definition
carry blood away from the heart
have a thicker muscle layer and have the ability to create greater pressure |
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Term
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Definition
carry blood toward the heart
hold a greater volume of blood |
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Term
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Definition
transport large volumes of blood away from the heart
aorta, pulmonary, common carotid, subclavian, common iliac |
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Term
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Definition
transport blood to the body's skeletal muscles and internal organs
thicker media layer
external carotid, brachial, femoral, mesenteric |
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Term
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Definition
control blood flow between arteries and capillaries
poorly defined adventitia |
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Term
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Definition
found in most regions of the body
complete endothelium lining |
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Term
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Definition
have pores in their walls due to an incomplete or perforated endothelium lining
found in the choroid plexus, endocrine organs, kidneys |
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Term
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Definition
contain large pores
permit extensive exchange of fluids and large solutes
found in liver, bone marrow, and adrenal glands |
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Term
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Definition
| interconnected network of capillaries |
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Term
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Definition
| a band of smooth muscle that guards the entrance to each capillary |
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Definition
| the arteriolar segment of passage way between arterioles and venules that contains smooth muscle cells capable of altering its diameter |
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Term
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Definition
| passageway between arterioles and venules that resembles a typical capillary |
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Definition
direct connections between arterioles and venules
common in visceral organs and joints where changes in body position could hinder blood flow |
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Term
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Definition
smallest veins that collect blood from capillaries
lack a media layer in smallest venules |
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Term
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Definition
thin media
adventitia is the thickest layer |
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Term
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Definition
include the superior and inferior vena cava
slender media surrounded by a tick adventitia |
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Term
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Definition
one way valves found in the limbs that prevent backflow of blood
valve opens above contracting skeletal muscle |
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Term
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Definition
| capillary beds from the celiac, inferior and superior mesenteric flow into portal veins that are routed to the liver for processing and storage before continuing to the inferior vena cava |
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Term
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Definition
leave the internal iliac arteries of the fetus, enter the umbilical cord and deliver blood to the placenta
low in oxygen |
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Term
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Definition
bring oxygen and nutrients to the developing fetus
high in oxygen |
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Term
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Definition
allows blood to flow freely from the right to left atria
bypasses pulmonary circuit |
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Term
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Definition
short circuit between the pulmonary and aortic trunks
move blood from pulmonary to systematic circulation |
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