Circulatory Hemodynamics & Systemic and Pulmonary Circulation Flashcards
circulation can be divided in
Systemic circulation (greater circulation or peripheral circulation)
Pulmonary circulation or central circulation
percentage of circulation in the pulmonary circulation
9
percentage of circulation in the veins, venules and venous sinuses
64
percentage of circulation in the arteries
13
percentage of circulation in the heart
7
What is the path of blood flow?
systemic arteries-systemic capillaries-systemic veins
What is the function of systemic circulation?
Carries oxygenated blood from the left side of the heart through the systemic arteries to all the organs and tissues.
What happens after O2 is delivered to organs and tissues on the path of systemic circulation?
After delivering oxygen and receiving carbon dioxide in the systemic capillaries, returns deoxygenated blood through the systemic veins to the right atrium where the pulmonary circulation begins
What is the range of pressure in systemic circulation?
70-105 mmHg
relatively high pressure system
What are the methods used to measure systemic circulation?
a blood pressure cuff.
Invasive methods using telemetry and catheters
path of blood flow in pulmonary circulation
Right atrium-Right ventricle-Pulmonary arteries-Pulmonary capillaries Pulmonary veins-Left atrium- Left ventricle
function of pulmonary circulation
Carries deoxygenated blood from the right side of the heart through the pulmonary arteries to the lungs.
What happens after O2 is received and CO2 is delivered in the pulmonary capillaries during pulmonary circulation?
Returns oxygenated blood through the pulmonary veins to the left atrium where the systemic circulation begins.
pressure in the pulmonary circulation
relatively low-pressure system
10-22 mmHg
how is pulmonary circulation measured
using pulmonary artery catheters
arteries
transport blood at a high pressure to tissues -their walls are strong and blood flows rapidly.
arterioles
Control valves for capillary beds, through which blood is released into the capillaries.
Have strong muscular walls and the capacity to completely dilate or close, thereby altering the blood flow to the tissue.
capillaries
High surface area for maximum transfer between blood and interstitium.
This area is where nutrients are exchanged.
Its walls are thin, and it has numerous pores through which fluid and electrolytes are exchanged.
venules
drainage from capillaries
veins
Transport conduits back to the heart and storage reservoirs for blood.
The pressure in the venous system is low, so the walls are thin, but they can contract and expand, thereby acting as reservoirs to hold extra blood depending on the tissue’s needs.
% of blood distribution in circulation
Systemic circulation 84%
Pulmonary circulation 16%
3 factors that contribute to Hemodynamics of Circulation
Blood flow
Resistance to blood flow
Blood pressure
Define the Ohm’s law of circulation
Blood flow occurs only when there is a difference in the pressure between the two ends of the vessel.
Define blood flow
the quantity of blood that passes a given point in the circulation at a given period.