13b. Cardiovascular function Flashcards
What triggers atrial contraction
SA node
What is occuring in the heart during atrial systole?
Atria contracting
AV valves are open
Blood being pumped to ventricles
What part of the cardiac cycle involves
All heart mucle in relaxation
All valves closed
Blood returning to atria
Atrial diastole
What part of the cardiac cycle involves
Atria contracting
AV valves are open
Blood being pumped to ventricles
atrial systole
What does the AV node do?
Conducts electrical impulses from the atrium to the ventricles, controlling heart rate
What is cardiac output (Q/CO)?
the amount of blood pumped out the heart per minute (L/min)
What do the Purkinje Fibres do?
Cause ventricular contraction
What is the number of times the heart beats per min
Heart rate (HR)
What is the amount of blood pumped out of the heart per beat
Stroke volume (SV)
What is stroke volume (SV)?
The amount of blood pumped out of the heart per beat
What is meant by systole?
Pressure exerted on the blood vessels during contraction
What is the pressure exerted on the blood vessels during contraction
systole
What is heart rate (HR)?
The number of times the heart beats per min
What transmits electrical signals from the AV node to thebundle branches
Bundle of HIS
What causes ventricular contraction?
Purkinje Fibres
What does the Bundle of HIS do?
transmits electrical signals from the AV node to thebundle branches
What is occuring in the heart during atrial diastole?
All heart mucle in relaxation
All valves closed
Blood returning to atria
What does the SA node do?
Triggers atrial contraction
What conducts electrical impulses from the atrium to the ventricles, controlling heart rate?
AV node
What is the order of the cardiac conduction system?
SA node - AV node - Bundle of HIS - Purkinje Fibres
What is pressure exerted on the blood vessels during relaxtion
diastole
What is the amount of blood pumped out the heart per minute (L/min)
Cardiac output (Q/CO)
What is diastole?
the pressure exerted on the blood vessels during relaxtion
What is occuring in the heart during ventricular systole?
Ventricles contracting
semilunar valves open
blood leaving heart into arteries
What part of the cardiac cycle involves ventricles contracting
semilunar valves open
blood leaving heart into arteries
ventricular systole
What is occuring in the heart during ventricular diastole?
Heart muscle in relaxation
All valves closed
Blood returning to the atria
What is the higher measure and numerator of a BP reading called?
systolic
What is the lower measure and denominator of a BP reading called?
diastolic
What is hypertension?
high blood pressure
What is hypotension?
low blood pressure
When blood pressure is too high what happens to the blood vessles to maintain homeostasis?
Vasodilation
When blood pressure is too low what happens to the blood vessles to maintain homeostasis?
Vasoconstriction
When blood pressure is too high what happens to HR to maintain homeostasis?
decreases
When blood pressure is too low what happens to HR to maintain homeostasis?
increases
Increased HR and vasoconstriction will impact BP by increasing/decreasing it?
increasing
If blood pressure is high baroreceptors will increase (stimulated) /decrease (inhibited) firing rate
increase/stimulated
Decreased HR and vasodilation will impact BP by increasing/decreasing it?
decreasing
If blood pressure is low baroreceptors will increase (stimulated) /decrease (inhibited) firing rate
decrease/inhibited
Increased firing rate (stimulation) of baroreceptors occurs as a result of and results in?
increased BP (hypertension) and results in lowered BP
Decreased firing rate (inhibited) of baroreceptors occurs as a result of and results in?
decreased BP (hypotension) and results in increased BP
