Cardio 1 Flashcards
primary roles of the circulatory system
distribution of dissolved gases and other molecules for nutrition, growth and repair, while simultaneously removing cellular wastes
three basic functional parts of circulatory system
heart, blood, vessels
Dr. Willian Harvey
showed that in one hour the heart pumped your entire body weight of blood and that there was no way the liver could constantly produce that much blood
Transport in the circulatory system can be divided into three types:
- materials entering the body
- materials moved from cell to cell
- materials leaving the body
arteries
carry blood away from the heart
veins
carry blood back to the back
capillaries
links arteries and veins
Liquids and gases commonly flow……
down pressure gradients
The initial region of high pressure in the cardiovascular system is created by…
contraction of the heart
as blood flows through the vessels….
pressure is lost due to friction
pressure is commonly measured in..
mm Hg
hydrostatic pressure
pressure exerted by gravity downward on the floor of the container as well as on the sides
pressure gradient is created through…
contraction of the ventricles
flow is based on…. not….
volume, velocity
flow
volume of blood that passes a given point in system per unit of time; proportional to pressure gradient and inversely proportional to resistance
Poiseuille’s equation
R=(8Ln)/pir^4
n in Poiseuille’s equation
viscosity of the fluid within the tube
With an equal flow rate, the velocity of blood is more rapid in…
narrow sections of vessel
pericardium
a tough membranous sac that encases the heart
atrioventricular valves
AV; allow flow from atria into ventricles
right atrium to right ventricle
tricuspid valve (right side tricuspid)
left atrium to left ventricle
mitral valve (bicuspid)
semilunar valves
one way valves that exist between the ventricle and outflow artery; do not need connective tissue
left ventricle to aorta
aortic valve
right ventricle to purlomary artery
pulmonary valve
