Cardio/Blood Vessels Flashcards
(196 cards)
Where is the heart situated in related to costal cartilages
3rd - 6th
How is the heart position different in taller and smaller people?
Taller: vertically oriented and centrally
Smaller: horizontally oriented and more to the left
What is situs inversus?
Heart and stomach are to the right and liver to the left
What layer of the heart is responsible for pumping?
Myocardium
What is myocardium responsible for?
Pumping
Thick, muscular middle layer
What layer of the heart lines the chambers and covers the valves of the heart?
Endocardium
Diastole
Ventricle relaxation and atrial contraction that moves blood into ventricles
S1 sound
Mitral and tricuspid valves close
“Lubb” first heart sounds
AKA: atrioventricular (AV) valves
S2
“Dubb”
Aortic and pulmonic valves close
AKA: semilunar valves
Explain entire systole
Ventricles contract Mitral/tricuspid (AV valves) close (s1) Pressure continues to rise Aortic and pulmonic valves open (semilunar) Pressure falls Aortic and pulmonic valves close (s2)
Valves only make noise when?
When closing
S3
Blood moves from atria to ventricles
S4
Causes complete emptying of atria
Extra little “squirt”
Explain events of diastole
Mitral and tricuspid (AV) valves open
Blood moves from atria to ventricles (s3)
Ventricles dilate
Atria contract as ventricles are almost filled
Complete emptying of atria (s4)
Cycle slightly slower on ______ side of the heart aka _______
Right
Splitting
Heart has what type of electrical conduction system that enables heart to contract within itself
Intrinsic
P wave
Spread of stimulus through the atria
Ala atria depolarization
PR interval
Time from initial stimulation of the atria to initial stimulation of the ventricles
QRS complex
Spread of a stimulus through the ventricles
Aka depolarize
ST segment and T wave
Return of stimulated ventricular muscle to a resting state
Repolarization of ventricle
U wave
Small deflection after T wave related to repolarization of purkinje fibers
QT interval
Time elapsed from the onset of ventricular depolarization until the completion of ventricular repolarization
What is hidden within the QRS complex
Atrial repolarization
Changes in heart at birth
- Ductus arteriosus and interatrial foramen ovale close
- Right ventricle assumes pulmonary circulation
- Left ventricle assumes systemic circulation