Chapter 20/21 The Heart Flashcards
Where is the heart located?
Mediastinum
The heart is enclosed and held in place by what?
The pericardium
The pericardium consist of what?
- outer fibrous pericardium
- inner serous pericardium
The serous pericardium has 2 layers what are they?
- Visceral
- Parietal
What is the parietal and visceral layer separated by?
A serious cavity and a fluid filled space
What is the right atrium?
Receives blood from the superior and inferior vena cava
What is the right ventricle?
Receives blood from the right atrium and sends the blood to the lungs
What is the left atrium?
Receives blood from the pulmonary veins
What is the left ventricle?
Receives blood from the the left atrium and pumps blood to the entire body
Which ventricle has the thicker wall?
The left one does because it needs to pump blood to the whole body
What is the fibrous skeleton?
- forms the foundation for which the heart valves attach
- serves as a point of insertion for cardiac muscle
- prevents overstretching of the heart values
- acts as an electrical insulator
What are the three walls of the heart?
- Epicardium
- Myocardium
- Endocardium
The valves of the heart open and close in response to what?
Pressure changes as the heart contracts and relaxes
What does the right and left atrioventricular valves do?
Prevent back flow form the ventricles into the atria
What does the right and left semilunar values do?
Prevent back flow from the arteries into the ventricles