Session 7 Flashcards
What is the role of the Right Atrium?
Receiving chamber of deoxygenated blood
The Right Atrium collects blood returning from the body via the superior and inferior vena cavae.
What structures are located in the Sinus Venorum?
- SVC
- IVC
- CS os
- SA node
- AV Node
The Sinus Venorum is a part of the Right Atrium that serves as a smooth area where blood enters.
What is the function of the Right Ventricle?
Receives blood from Right Atrium and propels it to the pulmonary artery
The Right Ventricle pumps deoxygenated blood to the lungs for oxygenation.
What are the characteristics of the Right Ventricle?
- Contracts against lower resistance than Left Ventricle
- Thinner walls
The Right Ventricle has to pump blood into the pulmonary circulation, which has lower resistance compared to systemic circulation.
What are the regions of the Right Ventricle?
- Inlet/Inflow Tract
- Outlet/Outflow Tract
- Apical Region
Each region has specific structural and functional roles within the Right Ventricle.
What is the role of the Left Atrium?
Receives oxygenated blood from pulmonary veins
The Left Atrium collects blood that has been oxygenated in the lungs.
How many pulmonary veins enter the Left Atrium?
Four
The pulmonary veins bring oxygen-rich blood from the lungs to the Left Atrium.
What are the wall properties of the Left Atrium?
Smooth, slightly thicker than Right Atrium
The increased thickness helps accommodate higher pressure from systemic circulation.
What is the function of the Left Ventricle?
Receives oxygenated blood from Left Atrium
The Left Ventricle is responsible for pumping oxygenated blood to the entire body.
What is unique about the myocardium of the Left Ventricle?
Three times thicker than Right Ventricle
The thicker myocardium is necessary to generate the higher pressures required for systemic circulation.
What separates the right and left atrium?
Atrial Septum
The Atrial Septum is crucial for maintaining separation between oxygenated and deoxygenated blood.
What is the role of the SA Node?
Primary pacemaker of the heart
The SA Node initiates the electrical impulses that regulate heartbeats.
Where is the AV Node located?
Triangle of Koch
The AV Node plays a crucial role in slowing down impulses from the SA Node.
What are the rates of the SA Node and AV Node?
- SA Node: 60-100 BPM
- AV Node: 40-60 BPM
These rates indicate the intrinsic pacing abilities of these nodes under normal physiological conditions.
What is the function of the Bundle of His?
Transmits impulses through cardiac skeleton
The Bundle of His connects the atrial and ventricular conduction pathways.
What is the role of Purkinje Fibers?
Located within the myocardium of ventricles; rate of 20-40 BPM
Purkinje Fibers are important for rapidly distributing electrical impulses throughout the ventricles.
What is the Cavotricuspid Isthmus?
Located between IVC and tricuspid valve
It is an important anatomical landmark in the Right Atrium.
True or False: The Left Ventricle has a smooth-walled outflow tract.
True
This smoothness helps reduce turbulence as blood exits to the aorta.
What are the components of the conduction pathway?
- SA Node
- AV Node
- Bundle Branches
- Purkinje Fibers
These components work together to ensure proper heart rhythm and function.
What is the function of the Chordae Tendineae?
Supports AV valves; prevents atrial collapse during contraction
The Chordae Tendineae connect the papillary muscles to the AV valves.
Fill in the blank: The _______ separates right and left ventricles.
[Ventricular Septum]
The Ventricular Septum is crucial for preventing mixing of oxygenated and deoxygenated blood.
