Chapter 18 Cardiovasular System: The Heart
The heart is enclosed in the _______________.
Two layer sac that surrounds the heart
Name the two layers of the pericardium
1. Parietal layer
2. Visceral layer
Is the visceral layer of the pericardium the internal layer or the outer layer?
What type of fluid reduces friction on the heart?
The inner most layer of the heart is called the _____________.
The cardiac muscle surrounding the heart is called the ___________.
The myocardium is made of what type of tissue
Also known as the visceral layer of the serous pericardium
The two atria are separated by what two items?
what is the purpose of the auricles?
increase atrial volume
What are the muscles lining the atria?
What three vessels inter the right atrium?
superior vena cava
inferior vena cava
What vessels enter the left atrium?
right and left pulmonary veins
What are the muscles lining the ventricles?
Thoracic pain caused by a fleeting deficiency in blood delivery to the myocardium
prolonged coronary blockage
Prevent backflow into the atria when the ventricles contract
Anchors AV valve cusps to the papillary muscles
Prevent backflow into the ventricles when the ventricles relax
What ensures the heart contracts as a unit?
Irregular heart rhythms
rapid, irregular contractions; useless for pumping blood