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53 Cards in this Set

  • Front
  • Back
What does the cardiovascular system consist of ?
heart and vessels
what are the vessels?
arteries capilaries and veins
What is the function of the CV system?
It supplies oxygen and nutrients and carries away waste and carbon dioxide
What does the heart look like and where is it located?
cone shaped muscular pump within the throacic cavity
How big is the average adult heart?
5 1/2 inches lont and 3 inches wide
What encloses the heart in a sac?
the pericardium
The pericardium is made up of two layers what are they?
the outer tough connective tissue is the fibrous pericardium then a layer of visceral pericardium
Visceral pericardium is also called what?
epicardium first layer of the heart outer layer
The visceral pericardium folds back on itself and forms the what?
pariental pericardium
Between the parietal and visceral pericardia is what?
the pericardial cavity
The cavity filled with serous fluid that reduces friction is what?
pericardial cavity
The wall of the heart is composed of three layers what are they
outermost layer is the epicardium,(viseral percardium) middle layer is the myocardium and the inner layer of endocardium
The thickest layer of the heart that contains cardiac muscle is what?
Waht does the atria or do?
recieves blood returning from the heart and have thin walls
What do the ventricles do?
pump blood to the body and are thick walled
What divides the atrium and the ventricles on each side?
What is the right atrioventriclular valve?
what is the left av valve
bicuspid or mitral
Chorrdae tendinae are what
these attatch to valves in the heart
what is the function of the valves/
to prevent back flow
What is the order of blood flow?
superior and inferior vena cava,R atrium, tricuspid valve, R ventricle, pulmanary valve, pulmanary trunk,
The uppermost or most superior part of the heart is the
The thickest part of the wall of the heart is the
The right atrium receives blood from the
inferior and superior vena cava
Cardiac pain is due to
interuption of blood supply to the cardiac muscle
Which of the following correctly describes the events of the cardiac cycle?
both atria contract and both ventricles relax; then both ventricles contract and both atria relax
During a normal cardiac cycle
the ventricles receive 70% of the blood from the atria passively during ventricular diastole ( both
The two major heart sounds are a result of
opening and closing of heart valves
Concentrations of which of the following electrolytes have a direct effect on the myocardium?
calcium and potassium
The middle layer of arterial walls is composed of
smooth muscle
The vessel that participates directly in the exchange of substances between body cells and the blood is the
The amount of blood that flows into capillaries is regulated by
precapillary sphincters
Plasma proteins help retain water in the blood by maintaining
osmotic pressure hydrostatic pressure vacuum
The middle layer of the walls of veins differs from arteries in that
it contains less smooth muscle
The maximum pressure in the artery, occurring during ventricular contraction is
systolic pressure
Tissues depend on an intact circulatory system to supply nutrients and oxygen and to remove accumulated wastes
What prevent the cusps from flapping into the chambers.
papillary muscles
What is composed of dense, fibrous, connective tissue, and provides places of attachment for heart valves and muscle fibers
The skeleton of the heart
Blood is supplied to the myocardium by
the coronary arteries, the first branches of the aorta.
Blood enters the ventricles during
atrial relaxation
The valves close because of
pressure differences
The pressure increases during ventricular contraction closing the
AV valves when intraventricular pressure exceeds intraatrial pressure.
What does the pulmonaryvalve ensure?
that blood leaves the right ventricle for the lungs through the pulmonary trunk
The substances exchanged through the capillary walls are exchanged by what?
diffusion, filtration and osmosis
What merges to form veins?
The lumen of veins are wider than that of the?
epanding and contracting of the arterial wall can be felt as the what?
What does the blood flow throught the venous system depend on?
breathing and vasoconstriction of veins, skeletal muscle contractions
pulmonary circuit is what
vessles that carry blood fromthe heart to the lungs and back to the heart
Systemic circuit is what
carries blood from the heart to all other parts of the body and back again and it also includes the coronary circulation.
What is the function of the pulmonary circulation?
it recieves oxygen in the lungs and get rid of carbon dioxide
What is the function of the systemic circulation?
takes oxygen rich blood to cells and pick up carbon dixoide
how do veins differ from arteries
They have thinner walls and valves and thinner middle layers