relate the features of an ECG recording to electrical and mechanical events of the
heart
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P-Q: atria contact
Q-T: ventricles contract
describe how pressure changes along the vascular network
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, -systolic pressure occurs when an artery is maximally stretched during
ventricular systole (contraction)
-diastolic pressure occurs when artery recoils no further during ventricular
diastole (relaxation)
describe how the body responds to an acute increase in blood pressure
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1. stimulus: increase in blood pressure
2. receptor: increase in baroreceptor firing frequency
3. control center: medulla cardiovascular center
4. effectors: cardiac SKM blood vessels
5. decrease BP
-an increase in blood pressure results In a rise/increase in action potential
frequency from the baroreceptors
-cardiac: decrease heart rate, decrease stroke volume
-skeletal muscle blood vessels: reduce vasoconstriction
describe the 4 steps for interpreting an ECG tracing
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1. heart rate: normal (60-100), slow (bradycardia <60), fast (tachycardia 100)
2. rhythm: R-R interval, regular or irregular
3. are waves present and recognizable
4. is there a QRS complex for every P wave? is the PR interval constant in
length
heart
Give this one a try later!
P-Q: atria contact
Q-T: ventricles contract
describe how pressure changes along the vascular network
Give this one a try later!
, -systolic pressure occurs when an artery is maximally stretched during
ventricular systole (contraction)
-diastolic pressure occurs when artery recoils no further during ventricular
diastole (relaxation)
describe how the body responds to an acute increase in blood pressure
Give this one a try later!
1. stimulus: increase in blood pressure
2. receptor: increase in baroreceptor firing frequency
3. control center: medulla cardiovascular center
4. effectors: cardiac SKM blood vessels
5. decrease BP
-an increase in blood pressure results In a rise/increase in action potential
frequency from the baroreceptors
-cardiac: decrease heart rate, decrease stroke volume
-skeletal muscle blood vessels: reduce vasoconstriction
describe the 4 steps for interpreting an ECG tracing
Give this one a try later!
1. heart rate: normal (60-100), slow (bradycardia <60), fast (tachycardia 100)
2. rhythm: R-R interval, regular or irregular
3. are waves present and recognizable
4. is there a QRS complex for every P wave? is the PR interval constant in
length
