Valves
Heart Wall
Heart Chambers
100
The Atrioventricular (AV) valves control the flow of blood from ___ to ___ ?
They control blood flow between atria and ventricles
100
What are the 3 layers of the heart wall?
epicardium, myocardium, and endocardium
100
The wall that separates atria is known as ____ .
Interatrial septum
200
What do the valves help ensure in blood flow?
Valves ensure one-way flow of blood through heart
200
Describe the general location of the heart (what side does it lie on, where is the base, where is the apex?)
The heart is located in the mediastinum, between the lungs. It lays more towards the left side of the body (this is the reason why your left lung is smaller). Base of the heart is located closer to head. Apex is located inferior to the base.
200
The muscular wall that separates ventricles is known as ____.
Interventricular septum
300
The valve that separates the Right Atrium and the Right Ventricle is known as the ____ .
Tricuspid valve.
300
The visceral layer of the serous pericardium is also known as ___ .
Epicardium
300
Is the left ventricle wall thicker, the same, or smaller than the right ventricle wall? Why?
Thicker, the RV only has to pump blood to the lungs, whereas the LV has the much harder job of pumping the blood throughout the whole body.
400
What is the function of the Semilunar Valves? What are the two semilunar valves?
control flow into great arteries; open and close because of blood flow and pressure.
Pulmonary semilunar valve (RV and Pul. Trunk)
Aortic semilunar valve (LV and Aorta)
400
What is the function of the pericardium?
Allows heart to beat without friction, provides room to expand, yet resists excessive expansion
400
The atria receive blood from the ___ .
The ventricles send blood away via ___ .
Veins. (towards heart)
Arteries. (Away)
500
These cords serve to prevent AV valves from flipping or bulging into atria when ventricles contract.
500
What are the functions of the fibrous skeleton? And what layer of the heart wall makes up this.
Myocardium.
1. Electrical insulation between atria and ventricles; important in timing and coordination of contractile activity
2. Provides structural support and attachment for cardiac muscle and anchor for valve tissue
500
What is the surface feature that correlates with the interatrial septum?
Coronary Sulcus