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Lecture Exam 4- Cardiovascular
n/a
41
Anatomy
Undergraduate 1
04/26/2012

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Cards

Term
Endocardium
Definition
inner most layer of the heart wall

composed of endothelium (simple squamous) and areolar connective tissue
Term
Myocardium
Definition
middle layer of the heart wall

composed of cardiac muscle tissue
Term
Epicardium
Definition
forms the external surface of the heart

composed of areolar connective tissue with a mesothelium covering
Term
Pericardium
Definition
double layered fluid filled sac that surrounds the heart

allows from increase and decrease in size
Term
Intercalated Discs
Definition
connect neighboring cardiac muscle cells
Term
Systole
Definition
contraction
Term
Diastole
Definition
relaxation
Term
Cardiac Cycle
Definition
the period between the start of one heartbeat and the beginning of the next
Term
Nodal Cells
Definition
responsible for establishing the rate of cardiac contraction
Term
Conducting Fibers
Definition
distribute the contractile stimulus to the general myocardium
Term
Sinoatrial (SA) Node
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
Term
Atrioventricular (AV) Node
Definition
sits within the floor of the right atrium

received impulse from SA node is slowed
Term
AV Bundle
Definition
where the impulse travels along the interventricular septum after it reaches the AV node
Term
Purkinje Cells
Definition
convey impulses very rapidly to the contractile cells of the ventricular myocardium
Term
Intima
Definition
innermost layer of a blood vessel

includes endothelial lining and underlying layer of connective tissue
Term
Internal Elastic Membrane
Definition
thick layer of elastic fibers in the outer margin of the intima of arteries
Term
Media
Definition
middle layer

contains sheets of smooth muscle in a framework of loose connective tissue
Term
External Elastic Membrane
Definition
thin band of elastic fibers in the outer margin of the media of arteries
Term
Adventitia
Definition
forms a collagen and elastic connective tissue sheath around a blood vessel

stabilizes and anchors the blood vessel
Term
Arteries
Definition
carry blood away from the heart

have a thicker muscle layer and have the ability to create greater pressure
Term
Veins
Definition
carry blood toward the heart

hold a greater volume of blood
Term
Elastic Arteries
Definition
transport large volumes of blood away from the heart

aorta, pulmonary, common carotid, subclavian, common iliac
Term
Muscular Arteries
Definition
transport blood to the body's skeletal muscles and internal organs

thicker media layer

external carotid, brachial, femoral, mesenteric
Term
Arterioles
Definition
control blood flow between arteries and capillaries

poorly defined adventitia
Term
Continuous Capillaries
Definition
found in most regions of the body

complete endothelium lining
Term
Fenestrated Capillaries
Definition
have pores in their walls due to an incomplete or perforated endothelium lining

found in the choroid plexus, endocrine organs, kidneys
Term
Sinusoids
Definition
contain large pores

permit extensive exchange of fluids and large solutes

found in liver, bone marrow, and adrenal glands
Term
Capillary Bed
Definition
interconnected network of capillaries
Term
Pre-capillary Sphincter
Definition
a band of smooth muscle that guards the entrance to each capillary
Term
Metarteriole
Definition
the arteriolar segment of passage way between arterioles and venules that contains smooth muscle cells capable of altering its diameter
Term
Thoroughfare Channel
Definition
passageway between arterioles and venules that resembles a typical capillary
Term
Arterivenous Anstomes
Definition
direct connections between arterioles and venules

common in visceral organs and joints where changes in body position could hinder blood flow
Term
Venules
Definition
smallest veins that collect blood from capillaries

lack a media layer in smallest venules
Term
Medium Veins
Definition
thin media

adventitia is the thickest layer
Term
Large Veins
Definition
include the superior and inferior vena cava

slender media surrounded by a tick adventitia
Term
Venous Valves
Definition
one way valves found in the limbs that prevent backflow of blood

valve opens above contracting skeletal muscle
Term
Hepatic Portal System
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
Term
Umbilical Arteries
Definition
leave the internal iliac arteries of the fetus, enter the umbilical cord and deliver blood to the placenta

low in oxygen
Term
Umbilical Veins
Definition
bring oxygen and nutrients to the developing fetus

high in oxygen
Term
Foramen Ovale
Definition
allows blood to flow freely from the right to left atria

bypasses pulmonary circuit
Term
Ductus Arteriosus
Definition
short circuit between the pulmonary and aortic trunks

move blood from pulmonary to systematic circulation
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