lab 8 cardio physiology LO's Flashcards
Cardiac Cycle process:
one complete round of a HEARTBEAT
both atria contract (systole) while both ventricles relax (diastole)
both ventricles contract while both atria relax
both atria & both ventricles relax briefly
pressure in the chambers rises & falls as they fill w/ blood → opens & closes valves
ATRIA CONTRACT IS WHAT PRESSURE
SYSTOLE PRESSURE
VENTRICLES RELAX IS WHAT PRESSURE
DIASTOLE PRESSURE
HEART SOUNDS 1, 2, 3,
1, LUPP
2. DUPP
3. MURMUR
LUBB- 1ST HEAR SOUND, WHAT HAPPENS
A-V values CLOSE as ventricular pressure rises
dupp- 2nd heart sounD WHAT HAPPENS
semilunar valves close as blood flows back towards ventricles due to ventricular pressure decreasing
MURMUR; 3RD BEAT, WHAT HAPPENS
sound heard when Mitral/bicuspid valve doesn’t close completely and blood backwashes into left atrium
components of the cardiac conduction system and its path
SA node, av, node, bundle of HIS (interventricular septum, purkinje fibers
Define heart conduction system
consists of specialized muscle tissue that acts as neural tissue
Spontaneously forms impulses
Impulses cause myocardium to contract
Typical ECG function and wave pattern.
function; recording of electrical changes that occur in the myocardium
used to assess heart’s ability to conduct impulses
waves correspond to electrical changes in the myocardium
P WAVE, QRS COMPLEX, T WAVE
ECG P- WAVE, WHAT HAPPENS
ATRIAL DEPOLARIZATION
EGCG QRS COMPLEX, WHAT HAPPENS
ventricular depolarization and atrial repolarization
ECG: T WAVE WHAT HAPPENS
ventricular repolarization
WHAT REGUALTES THE HEART BEAT AND WHERE IS IT LOCATED
SA NODE
That is in the superior vena cava and right atria. This is what regulates the heartbeat.
DEFINE DEPOLARIZATION AND REPOLARIZATION
Depolarization- loss of an electrical charge
Repolarization – return to resting potential
Pressure exerted by blood against the walls of vessels (pressure waves that travel through the blood – pulse)
BLOOD PRESSURE
Created by contraction of ventricles and measured in brachial atery and reported as systolic/dialstolic
BLOOD PRESSURE
Pressure when the heart beats
SYSTOLIC PRESSURE
The pressure that is in the arteries when the heart rests between beats.
DIASTOLIC PRESSURE
Describe how blood pressure and heart rate change when changing body positions and with exercise.
muscles are active = need more blood flow RBC
compensates:
- Increasing respiratory rate and depth
- vasodilation
-Decrease resistance in active tissues, increase Sympathetic activity (increase HR and SV = Increase CO)
Explain how the baroreceptor reflex restores the blood pressure to homeostatic levels.
sends impulses to the cardiac control center in the medulla oblongata that regulates the impulses to the heart also homeostasis
Parasympathetic impulses: decrease heart action
Sympathetic impulses increase heart action.
what is Parasympathetic impulses:
decrease in heart action
what is Sympathetic impulses
increase heart action.
where are the barereptors stimulate from
medulla obligate
