236652
Description
Flashcards by Elaine Corrigan, updated more than 1 year ago
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Created by Elaine Corrigan
about 11 years ago
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| Question | Answer |
| What is the cardiac cycle? | This includes all the events associated with the flow of blood through the heart during a single heart beat. |
| What is Diastole? | o.4 sec Atrial and ventricular relaxation Blood returning from circulation..venous return Main function: Filling in preparation for contraction |
| What is atrial systole? | Active phase; 0.1 sec Atrial muscle contraction initiated by electrical stimulation. as a result of contraction blood remaining in atria is forced into ventricles Main function: completion of filling of the ventricles Ventricles now contain on average 110ml.. full |
| What is ventricular systole? | Active phase 0.3 sec ventricular muscle contraction initated by electrical stimulation due to increase pressure at begining of this phase the A-V valves are forced closed. Due to increasing pressure shortly after the beginning of this phase the aortic and pulmonary valves are forced open blood ejected into circulation main function:eject blood from heart an average of 70ml |
| What is a heart sound ? | Interruption in blood flow make noises The closure of valves interupts blood flow Valves close due to pressure gradients |
| First heart sound | closure of mitral and tricuspid valves Begining of systole |
| Second heart sound? | closure of aortic and pulmonary valves end of systole |
| Stroke volume = | volume of blood ejected from the heart per minutes (ejection fraction) 70ml heart rate x stroke volume |
| What is vasoconstriction? | Increase sympathetic stimulation results in increases muscle contraction which then results in: increased muscle tone. increase vessel thickness decreased lumen size increase peripheral resistance |
| What is vasodilatation ? | Generally due to decreased sympathetic stimulation causing decreased muscle contraction which results in : muscle tone , vessel thickness, lumen size and peripheral resistance. |
| What is hydrostatic pressure? | It is blood pressure which tends to drive fluid out of the bloodstream |
| What is osmotic pressure? | Osmotic pressure of the blood tends to pull water back in due to plasma proteins in blood |
| How much aterial fluid moves out of the capillaries per day? | 24l |
| Function fo the lymphatic system? | to collect and return surplus interstitial fluid and plasma proteins to the blood. To defend the body against invading organisms by means of the immune system. To absorb lipids for the digestive tract. |
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