Ch.5 Cardiovascular System Flashcards
What does the cardiovascular system consist of? what is it’s role in the body?
heart, blood vessels, and blood. To pump blood to all body tissues
what are three things the blood does?
- it is a fluid tissue that transports oxygen and nutrients to the other body tissues
- it returns some waste products from these tissues to the kidneys and carries carbon dioxide back to the lungs
- blood cells play important roles in the immune and endocrine systems
double-walled sac that encloses the heart
pericardium
What are the three layers of the heart walls?
- epicardium
- myocardium
- endocardium
the external layer of the heart and the inner layer of the pericardium
epicardium
middle and thickest layer of the heart, consists of specialized cardiac muscle
myocardium or myocardial muscle
inner lining of the heart, consists of epithelial tissue
endocardium
supply oxygen-rich blood to the myocardium
coronary arteries
the two upper chambers of the heart, receive all blood
atria
a wall that separates two chambers
septum
two lower chambers of the heart, pump out all blood
ventricles
which walls are thicker, the atria or ventricles? Why?
the ventricles, bc they have to pump the blood throughout the whole body
valve that controls the opening between the right atrium ad the right ventricle
tricuspid valve
valve that is located between the right ventricle and the pulmonary artery
pulmonary semilunar valve
valve that is located between the left atrium and the left ventricle, also known as bicuspid valve
mitral valve
valve that is located between the left ventricle and the aorta
aortic semilunar valve
part of the heart that receives oxygen-poor blood from all tissues, except the lungs
right atrium
part of the heart that pumps the oxygen-poor blood through the pulmonary semilunar valve and into the pulmonary artery, which carries it to the lungs
right ventricle
part of the heart that receives oxygen-rich blood from the lungs through the four pulmonary veins
left atrium
part of the heart that receives oxygen-rich blood from the left atrium, which is then carried to all parts of the body, except the lungs
left ventricle
What are the two types of circulation? Describe them.
pulmonary circulation-the flow of blood only between the heart and lungs
systemic circulation-flow of blood to all parts of the body except the lungs
carry deoxygenated blood out of the right ventricle and into the lungs. This is the only place in the body where deoxygenated blood is carried by arteries instead of veins.
pulmonary arteries
carry the oxygenated blood from the lungs into the left atrium of the heart. this is the only place in the body where veins carry oxygenated blood
pulmonary veins
establishes the basic rhythm and rate of the heartbeat using electrical impulses by starting each wave of muscle contraction
sinoatrial node-SA node
receives electrical impulses from the SA node
atrioventricular node-AV node
group of fibers within the interventricular septum which carry the electrical impulse to the purkinje fibers
bundle of His-HISS
specialized conductive fibers located within the walls of the ventricles which relay the impulses to the cells of the ventricles, causing them to contract
Purkinje fibers
What are the three major types of blood vessels?
- arteries
- capillaries
- veins
large blood vessels that carry blood away from the heart to all regions of the body
arteries
blood vessel that expands and contracts with the pumping beat of the heart (also why blood will spurt out from beat if severed)
arteries
why is arterial blood bight red?
bc it is oxygen rich
the largest blood vessel in the body and the main trunk of the arterial system
aorta
major arteries that carry blood upward to the head
carotid arteries
smaller thinner branches of arteries that carry blood to the capillaries
arterioles
low-pressure collecting system to return oxygen-poor blood to the heart
veins
what do veins have to prevent blood from flowing away from the heart?
valves
smallest veins that join to form the larger veins
venules
two largest veins in the body that return blood into the heart
venae cavae
smallest blood vessels in the body, form networks of expanded vascular beds that deliver oxygen and nutrients to the cells of tissues
capillaries
rhythmic pressure against the walls of an artery caused by the contraction of the heart
pulse
measurement of the amount of pressure exerted against the walls of the arteries
blood pressure
highest type of pressure against the walls of an artery, which occurs when the ventricles contract
systolic pressure
lowest type of pressure against the walls of an artery which occurs when the ventricles relax
diastolic pressure
fluid tissue in the body
blood
part of the blood that is straw-colored and contains nutrients, hormones, and waste products
plasma
the two clotting proteins found in plasma used to control bleeding
fibrinogen
prothrombin
the plasma fluid after the blood cells and the clotting proteins have been removed
serum
blood cells whose primary role is to transport oxygen to the tissues
erythrocytes-red blood cells-RBC
iron-containing pigment of erythrocytes which transports the oxygen
hemoglobin
blood cells involved in defending the body against infective organisms and foreign substances
leukocytes-white blood cells-WBC
formed in red bone marrow and the most common type of white blood cell, play major role in immune system’s defense against pathogens
neutrophils
formed in red bone marrow and the least common type of white blood cells, responsible for the symptoms of allergies
basophils
white blood cell formed in red bone marrow and then migrate to tissues throughout the body, destroy parasitis organisms and play a major role in allergic reactions
eosinophils
white blood cell formed in red bone marrow, lymph nodes, and spleen, that identifies foreign substances and germs and produce antibodies that specifically target them
lymphocytes
white blood cell formed in red bone marrow, lymph nodes, and spleen, provide immunological defenses against many infectious organisms
monocytes
smallest formed elements of the blood, play important role in clotting
thrombocytes or platelets
how are blood types classified?
according to the presence or absence of certain antigens
What is the Rh factor?
it refers to the presence or absence of the Rh antigen on red blood cells, named for rhesus monkeys where it was first found
gases that are normally dissolved in the liquid portion of blood
blood gases. oxygen, carbon dioxide, and nitrogen
physician who specializes in diagnosing and treating abnormalities, diseases and disorders of the heart
cardiologist
physician who specializes in diagnosing and treating abnormalities, diseases, and disorders of the blood and blood forming tissues
hematologist
physician who specializes in the diagnosis, medical management, and surgical treatment of disorders of the blood vessels
vascular surgeon
structural abnormalities caused by the failure of the heart to develop normally before birth
congenital heart defects
atherosclerosis of the coronary arteries that reduces the blood supply to the heart muscle
coronary artery disease
hardening and narrowing of the arteries caused by a buildup of cholesterol plaque on the interior walls of the arteries
atherosclerosis
fatty deposit found within the lumen of an artery
plaque
deposit of plaque on or within the arterial wall and a characteristic of atherosclerosis
atheroma
group of cardiac disabilities resulting from an insufficient supply of oxygenated blood to the heart
ischemic heart disease
condition in which there is an insufficient oxygen supply due to a restricted blood flow to a part of the body
ischemia
condition of episodes of severe chest pain due to inadequate blood flow to the myocardium
angina
occlusion of one or more coronary arteries caused by plaque buildup
myocardial infarction-heart attack