Bio 265 Review Flashcards
Explain the electrical conduction of the heart.
Starts from the SA Node, to the AV node, Bundle of His, Wall fibers, Purkinje Fibers
What is the P wave representing?
depolarization of atria
What is the QRS wave representing?
Depolarization of the ventricles.
What is hidden in the QRS wave?
the repolarization of the atria
What is the T wave?
Repolarization of The ventricles
What is the first hear sound? What is the second?
Lubb.
Dubb
What makes the lubb sound?
The opening of aortic valves, and closing of the bicuspid valve
What makes the DUB sound?
Aortic valve closes
Layers of the epidermis
Stratum Corneum Stratum Lucidum Stratum Granulosum Stratum Spinosum Stratum Basale
What is Diastole?
relaxation of the heart.
What is systole?
Contraction of the chambers
How much of cardiac cycle does Diastole make up?
2/3
How much of cardiac cycle does systole make up?
1/3
what does the opening and closing of valves depend on?
Pressure
In the cardiac cycle what starts first, second and third?
Systole, Diastole, Systole
First phase of Cardiac Cycle
Iso-volumic contraction
What happens in iso-volumic contraction? What valves do what?
The aorta valves open, while the mitral valves close.
Phases in Diastole
Rapid Inflow, Diastasis, Atrial Systol, and Iso-volumic relaxation
Phases in Systole
Iso-volumic contraction, ejection
What happens in iso-volumic contraction?
Pressure in ventricles begins to increase rapidly, AV valve closes once that
Stroke Volume
End-Diastolic volume (EDV) – End-Systolic Volume (ESV)
preload
he degree of stretch at the end of diastole
afterload
The force that opposes the flow of blood out of the ventricles during systole
After load
The force that opposes the flow of blood out of the ventricles during systole
