Chapter 18 Heart Flashcards
(27 cards)
How big is the Human Heart
12 cm long 9 wide 6 thick
How much does an adult heart weigh
300 grams
What is the pericardium
Three layered covering that surrounds and protects the heart
What are the 3 layers of the pericardium
Fibrous peridcardium
2 layer deep serous pericadium made up of
partial pericardium
visceral pericardium
Describe the Fibrous Pericardium (structure & function)
Outermost layer, dense connective tissue anchors heart in mediastinum
Describe the Partial Pericardium
Outer most serous layer under the Fibrous Pericardium
Describe the Visceral Pericardium
Linner most serous layer that lines the surface heart
What are the 3 layers of the Pericardium seperated by ?
pericarial cavity which reduces friction
What are the 3 functions of the Pericardium
Protects and anchors the heart
Prevents overfilling of the heart with blood
Allows heart to work in friction free enviroment
How many layers does the heart wall consist of
- Epicardium-outer layer
- Myocardium-cariac muscle, making up bulk of the heart
- Ecardium- endotheial layer of the inner myocardium surface
What are sulchi
Grooves on the surface of the heart
Which vessles return blood to the heart
Superior and anterior Ventae Cavae
Right and left Pulmonary Veins
Which vessels take blood away from the heart
Pulmonary Truck
Ascending Aorta
What is the purpose of the Atria
Recieving chamber in the heart
How does blood enter the right Atria
3 veins
Superior Venae Cavae
Inferior Venae Cavae
Coranory Sinus
How does blood enter the Left Atria
4 pulmonary Veins
What is the purpose of Ventricles
They are the discharging chamber of the heart
Where does the right Ventricle pump blood
To the pulmonary truck
Where does the left Ventricle pump blood
to the aorta
What do heart valves do?
Ensure unidirection blood flow through the heart
Where is the Atrioventricular Valve found
between the atria and ventricles
What is the purpose of the AV valve
Prevent backflow into the atria when ventricles contract
What is the purpose of the semiludar valve
Prevents backflow of blood into the ventricles
describe the cardiac muscle
one or two nuclei, striated and branched
