Chapter 5 The Cardiovascular System A&P Flashcards
means pertaining to the heart and blood vessels
cardiovascular
is a hollow, muscular organ located in the thoracic cavity, between the lungs
heart
is the lower tip of the heart
apex
is the double-walled membranous sac that encloses the heart
pericardium (pericardial sac)
means pertaining to a membrane
membranous
is a fibrous sac that surrounds and protects the heart
parietal pericardium
is found between these two layers, where it acts as a lubricant to prevent friction as the heart beats
pericardial fluid
is the inner layer of the pericardium that also forms the outer layer of the heart
visceral pericardium
is the external layer of the heart and the inner layer of the pericardium
epicardium
is the middle and thickest of the heart’s three layers
myocardium
consists of epithelial tissue, is the inner lining of the heart
endocardium
supply oxygen-rich blood to the myocardium
coronary arteries
are the two upper chambers of the heart, and these chambers are divided by interatrial septum
atria
are the two lower chambers of the heart, and these chambers are divided by interventricular septum
ventricles
controls the opening between the right atrium and right ventricle
tricuspid valve
is located between the right ventricle and the pulmonary artery
pulmonary semilunar valve
is located between the left atrium and left ventricle
mitral valve (bicuspid)
is located between the left ventricle and the aorta
aortic semilunar valve
is the flow of blood only between the heart and lungs
pulmonary circulation
carry deoxygenated blood out of the right ventricle and into the lungs
pulmonary arteries
carry oxygenated blood from the lungs into the left atrium of the heart
pulmonary veins
includes the flow of blood to all parts of the body except the lungs
systemic circulation
is the ability to pump blood effectively throughout the body. consists of contraction and relaxation
heartbeat
the rate and regularity of the heartbeat from nerves that stimulate the myocardium of the chambers of the heart
conduction system
is located in the posterior wall of the right atrium near the entrance of the superior vena cava; establishes basic rhythm and is known as the pacemaker
sinoatrial (SA) node
located on the floor of the right atrium near the interatrial septum
antrioventricular (AV) node
is a group of fibers located within the interventricular septum. carry an electrical impulse to ensure the sequence of the heart contractions
bundle of His
are specialized conductive fibers located within the walls of the ventricles. this stimulation that causes the ventricles to contract
Purkinje fibers
refers to the normal beating of the heart
sinus rhythm
is due to the stimulation (contraction) of the atria
P wave
shows the stimulation (contraction) of the ventricles. the atria relax as the ventricles contract
QRS complex
is the recovery (relaxation) of the ventricles
T wave
are large blood vessels that carry blood away from the heart to all regions of the body
arteries
means within an artery or pertaining to the inner portion of an artery
endarterial
is bright red in color because it is oxygen rich.
arterial blood
is the largest blood vessel in the body.
aorta
are the major arteries that carry blood upward to the head
carotid arteries
is located on each side of the neck
common carotid artery
which brings oxygen-rich blood to the brain
internal carotid artery
brings blood to the face
external carotid artery
are the smaller, thinner branches of arteries that deliver blood to the capillaries
arterioles
are only one epithelial cell in thickness, are the smallest blood vessels in the body
capillaries
form a low-pressure collecting system to return oxygen-poor blood to the heart
veins
are the smallest veins that joint to form the larger veins
venules
veins located within the tissues and away from the body surface
deep veins
are the two largest veins in the body. return blood into the heart
venae cavae
transports blood from the upper portion of the body to the heart
superior vena cava
transports blood from the lower portion of the body to the heart
inferior vena cava
is the rhythmic pressure against the walls of an artery caused by the contraction of the heart
pulse
is the measurement of the amount of systolic and diastolic pressure exerted against the walls of the arteries
blood pressure
occurs when the ventricles contract, is the highest pressure against the walls of an artery
systolic pressure
means contraction of the heart
systole
occurs when the ventricles are relaxed, is the lowest pressure against the walls of an artery
diastolic pressure
is a straw-colored fluid that contains nutrients, hormones, and waste products
plasma
is plasma fluid after the blood cells and the clotting proteins have been removed
serum
are the clotting proteins found in the plasma
fibrinogen and prothrombin
also known as a red blood cell. role of these cells is to transport oxygen to the tissues
erythrocytes
which is the oxygen-carrying blood protein pigment of the erythrocyte
hemoglobin
also known as white blood cells. are the blood cells involved in defending the body against infective organisms
leukocytes
most common type of WBC (bacterial infections)
neutrophils
least common type of WBC, responsible for causing symptoms of allergies (histamines)
basophils
are formed in red bone marrow, and migrate to tissues. destroy parasitic organisms and play a role in allergic reactions
eosinophils
identify foreign substance and germs (bacteria or viruses) in the body and produce antibodies that specifically target them
lymphocytes
are formed in red bone marrow. provide immunological defenses against many infectious organisms
monocytes
are the two phagocytitic blood cells
monocytes; neutrophils
also known as platelets, are the smallest formed element. play a role in clotting
thrombocytes
what are the three formed elements of blood
erythrocytesleukocytesthrombocytes
is any substance that the body regards as being foreign
antigen
four major blood types
A, AB, B, and O
defines the presence of absence of the Rh antigen on red blood cells
Rh factor
have Rh antigen
Rh positive
do not have Rh antigen
Rh negative
are gases that are normally in the liquid portion of blood
blood gases
is a physician who specializes in diagnosing and treating abnormalities, diseases, and disorders of the heart
cardiologist
is a physician who specializes in diagnosing and treating abnormalities, diseases, and disorders of the blood and blood-forming tissues
hematologist
is a physician who specializes in the diagnosis, medical management, and surgical treatment of disorders of the blood vessels
vascular surgeon
is a disease of the heart muscle that causes the heart to become enlarged and to pump less strongly
dilated cardiomyopathy
means pertaining to sudden occurrence
paroxysmal
is the flow of blood through the vessels of an organ
perfusion
caused by a thrombus
thrombotic
means blockage
occlusion
is consistently elevated blood pressure of unknown cause
essential hypertension (primary hypertension or idiopathic hypertension)
is caused by a different medical problem, such as kidney disorder or a tumor on the adrenal glands
secondary hypertension
is characterized by very high blood pressure.
malignant hypertension
the process of clotting blood
coagulation
what color is arterial blood
bright red
is the lack of blood flow and oxygen to the heart muscle
cardiac ischemia
occurs during exertion (exercise) and resolves with rest. form of angina
stable angina
may occur either during exertion or rest, and is a precursor to a myocardial infarction
unstable angina
means a sudden insufficiency of blood
infarction
is a localized area of dead tissue caused by a lack of blood
infarct