Cardio Physio Flashcards
Beta adrenergic receptors in blood vessels
Alpha 1
Beta 2
Slowest blood flow in the circulatory system
Capillaries
Has largest percentage of blood in the circulatory system
Veins
thin walled under low pressure
Turbulent flow is associated with _____ reynolds number? Specifically?
High
Formula for pulse pressure
Systolic - Diastolic
Right atrial pressure also known as
Central venous pressure
A strain in the structure of a substance produced by pressure when its layers are laterally shifted in relation to each other
Shear
Estimates left atrial pressure
Pulmonary Capillary Wedge Pressure
QRS complex represents ______
Ventricular depolarization
Which part of cardiac cycle is not seen in ECG
Atrial repolarization
T wave in ECG represents
Ventricular repolarization
Hypokalemia results to flat/tall T waves?
Flat T waves
HyperK+»_space; Tall T waves
Hypercalcemia affects the QT interval duration by _______
Shortened QT interval»_space; faster contraction
ST segment elevation is seen in
STEMI
q wave is seen in
STEMI
Phaase 4 of SA node action potential is due to _________ via the _______ channels
Na+ influx
Slow funny Na Channels (If channels)
Inhibition of pacemaking of other latent pacemakers by the SA node
Overdrive suppression
Which is responsible for setting the heart rate
rate of phase 4 depolarization
Which pacemaker has the slowest conduction velocity?
AV node
Which component of the conductive system has the fastest conduction velocity?
Bundle of His, Purkinje fibers and Ventricles
Blood ejected by the ventricle per heart beat?
Stroke volume
C wave and S1 is seen in _______ of the cardiac cycle
Isovolumic contraction
Incisura is seen in the ___________
isovolumic relaxation phase
Rapid ventricular filling is characterized by this heart sound
S3
Center responsible for regulation of HR and BP
Nucleus tractus solitarius in medulla
Carotid baroreceptors respond in this pressure range
50mmHg - 180 mmHg
The “last ditch stand”
CNS ischemic response
Normal net filtration
2ml/min
Increased venous return increases the HR and CO is known as the _____
Bainbridge reflex
Most important mechanism for temperature regulation in the skin
Sympathetic
How many % of CO goes to the brain
14-15%
Triad of Cushing’s reflex
Hypertension
Bradycardia
Apnea or irregular respirations
Where are the baroreceptors found
carotid sinus
aortic arch
Long term control of BP is via the
R-A-A System
Control conduits for blood flow
arterioles
