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Cardiovascular System (circulatory system)
- -Transports elements in the blood throughout the body.
- -Regulates body temperature.
- -Maintains Homeostasis
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Oxygen
Gas necessary for cellular respiration and circulated to the tissues by the blood.
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Apex
The tip of the heart that rests on the diaphragm.
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Diaphragm
Main muscle of breathing that lies between the thoracic and abdominal cavities.
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Mediastinum
- -Area behind sternum and in front of lungs.
- -Separates lungs.
- -Includes trachea, esophagus, and large blood vessels.
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Thoracic Vertebrae
Backbone
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Endocardium
Inner layer that lines the heart chambers.
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Epicardium
Outermost layer of the heart.
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Myocardium
- -Thick middle layer of the heart
- -Muscle of the heart.
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Pericardium
Sac in which the heart is located
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Visceral Layer
Membrane that covers the outside of the heart.
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Atrium
- -Top chamber of the heart.
- -Smaller and less muscular than ventricle.
- -Function is to hold blood until it is moved to the ventricle.
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Chambers
4 Cavities of the heart.
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Septum
Wall that divides the left and right chambers of the heart.
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Ventricles
- -Pump blood out of heart.
- -Left ventricle has the thickest wall.
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Aorta
Body's largest artery
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Aortic Semilunar Valve
- -Valve between left ventricle and Aorta.
- -Prevents blood from returning to the left ventricle.
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Cardiac Valves
Valves that prevent blood in the ventricles from backing up into the atria when the ventricles contract.
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Cardiomegaly
Enlargement of the heart.
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Chordae Tendineae
Fiberous cords that prevent the atrioventricular valves from collapsing under pressure.
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Hypertrophy
Enlargement of an organ.
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Inferior Vena Cava
Vein that brings blood low in oxygen from the lower limbs and trunk.
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Mitral (bicuspid) Valve
Valve between the left atrium and left ventricle
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Pulmonary Artery
Artery that carries oxygen-poor blood from the right ventricle to the lungs.
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Pulmonary Semilunar Valve
- -Valve between right ventricle and pulmonary artery
- -Prevents backflow of blood into the right ventricle
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Pulmonary Vein
Vein that carries oxygenated blood from the lungs back to the left atrium.
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Regurgitation
Blood flowing back from where it came.
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Superior Vena Cava
Vein that brings blood low in oxygen from the head and upper limbs.
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Tricuspid Valve
Valve that separates right atrium and right ventricle.
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Valve
Structure that controls blood direction through the heart.
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Valvular Insufficiency
When a valve loses its abitlity to close tightly and permits blood to leak back into chamber.
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Venae Cavae
- -Largest veins in the body.
- -Bring oxygen-poor blood from the body to the right atrium.
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Cardiac Cycle
One heartbeat, which is one contraction and one relaxation.
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Diastole
Relaxation of the heart
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Heartbeat
- -One cardiac cycle
- -measurable contraction and relaxation of the heart.
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Murmur
Abnormal heart sound
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Stethescope
Instrument used to listen to heart.
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Systole
Contraction of the heart
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Atrioventricular Bundle
Fibers of the atrioventircular node that send impulses to the Purkinje fibers
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Atrioventricular (AV) Node
Group of cells in the right atrium that produces heart's electrical impulses.
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Bundle of His
- -Atroioventricular Bundle
- -Small band of muscle fibers that receive electrical impulses from the AV node.
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Cardiac Output
Amount of blood pumped by the heart in one minute.
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Electrocardiogram
- -Recording of cardiac cycles
- -Graphic picture of the heart's electrical activity.
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Purkinje Fibers
- -Extend along the outer walls of the ventricles
- -Cause the ventricles to contract.
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Sinoatrial (SA) Node
- -Natural pacemaker of the heart.
- -Located in right atrial wall
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Stroke Volume
The amount of blood pumped by the ventricles in one beat.
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Antagonistic
Muscle exerting an opposite action to that of another muscle (in this case, sympathetic and parasympathetic)
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Arrhythmia
Irregular heart rate or rhythm
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Autonomic Nervous System
System responsible for involuntary actions of muscles and glands.
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Flutter
A rapid but regular heart contraction.
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Heart Block
Occurs when an impulse is slowed or stopped at a certain point in the conduction process.
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Parasympathetic
System that returns the body back to balance after responding to. a reactive state
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Sympathetic
System responsible for the body's response to something
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Carbon Dioxide
Gas waste released by the body cells.
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Coronary Circulation
Circulation of blood through the heart.
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Deoxygenated Blood
Blood that is low in oxygen.
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Pulmonary Circulation
Moves blood from the heart to the lungs then back to the heart again.
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Systemic Circulation
The movement of oxygenated blood through the heart and back out to body tissue.
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Anterior Descending Artery
Artery that supplies blood to the right and left ventricles
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Circumflex Artery
Artery that suppplies blood to the left atrium and left ventricle.
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Coronary Arteries
Blood vessels that branch from the aorta and supply the heart muscle with oxygen.
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Infarction
Death of tissue
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Ischemia
Heart muscle is deprived of oxygen.
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Marginal Artery
Artery that supplies blood to the right atrium and right ventricle
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Posterior Descending Artery
Artery that supplies blood to the left and right ventricles.
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Anastomose
When arteries connect.
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Bifurcate
Split into 2 branches
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Circle of Willis
Circle of arteries that provides a detour for arterial blood if an obsruction occurs.
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External Carotid Arteries
Provide blood supply to the neck, face, and scalp.
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Internal Carotid Arteries
Supply blood to the brain and networks within various parts of the brain.
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Portal Vein
Carries blood from the digestive organs to the liver.
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Vertebral Arteries
Pair of arteries that arise from the subclavian arteries and move toward the brain.
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Ductus Arteriosus
In a fetus, connects the pulmonary artery with the aorta.
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Ductus Venosus
In a fetus, conducts blood from the umbilical vein, bypassing the liver to the inferior vena cava.
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Foramen Ovale
In a fetus, an opening located in the septum between the atria, allows blood to be pumped through heart and to the body without passing through lungs.
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Cardiologist
Physician specializing in the heart.
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Cyanosis
Bluish discoloration of the nails or skin caused by lack of oxygen in the blood.
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Diaphoresis
Excessive sweating
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Hypoxia
Condition of low oxygen levels
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Internist
Physician who specializes in internal organs.
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Occlusion
Obstruction of blood vessel
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Prophylactic
Preventative
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Sequela
Secondary result of another disease.
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Stenosis
- -Condition in which blood cannot flow through vlaves into the next chamber.
- -caused by hardening of the flaps or scar tissue on the flaps.
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Arterioles
Small arteries that carry blood to the capillaries.
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Artery
Blood vessel that transports blood high in oxygen from the heart.
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Blood Vessels
Elastic tube-like channel through which blood flows.
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Capillary
Smallest blood vessel that moves oxygen into and removes waste products from body tissue.
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Diameter
The space across a vessel (from wall to wall)
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Varix
Twisted and swollen vein.
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Vasoconstrict
To make a blood vessel narrower.
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Vasodilate
To make a blood vessel wider.
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Vein
Blood vessel that carries blood low in oxygen to the heart.
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Venules
Small veins that carry blood from cappilaries to veins.
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Aneurysm
Weakness in the wall of an artery.
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Claudication
Symptoms of pain and weakness in the legs that subside with rest.
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Constrict
To make smaller or decrease in size.
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Dilation
Making larger, increase in size.
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Embolus
Clot that moves through the bloodstream.
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Phlebitis
Inflammation of the walls of veins.
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Thrombus
Stationary clot.
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