Chapter 18 Heart Flashcards Preview

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Flashcards in Chapter 18 Heart Deck (27):
1

How big is the Human Heart

12 cm long 9 wide 6 thick

2

How much does an adult heart weigh

300 grams

3

What is the pericardium

Three layered covering that surrounds and protects the heart

4

What are the 3 layers of the pericardium

Fibrous peridcardium
2 layer deep serous pericadium made up of
partial pericardium
visceral pericardium

5

Describe the Fibrous Pericardium (structure & function)

Outermost layer, dense connective tissue anchors heart in mediastinum

6

Describe the Partial Pericardium

Outer most serous layer under the Fibrous Pericardium

7

Describe the Visceral Pericardium

Linner most serous layer that lines the surface heart

8

What are the 3 layers of the Pericardium seperated by ?

pericarial cavity which reduces friction

9

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

10

How many layers does the heart wall consist of

1.Epicardium-outer layer
2.Myocardium-cariac muscle, making up bulk of the heart
3.Ecardium- endotheial layer of the inner myocardium surface

11

What are sulchi

Grooves on the surface of the heart

12

Which vessles return blood to the heart

Superior and anterior Ventae Cavae
Right and left Pulmonary Veins

13

Which vessels take blood away from the heart

Pulmonary Truck
Ascending Aorta

14

What is the purpose of the Atria

Recieving chamber in the heart

15

How does blood enter the right Atria

3 veins
Superior Venae Cavae
Inferior Venae Cavae
Coranory Sinus

16

How does blood enter the Left Atria

4 pulmonary Veins

17

What is the purpose of Ventricles

They are the discharging chamber of the heart

18

Where does the right Ventricle pump blood

To the pulmonary truck

19

Where does the left Ventricle pump blood

to the aorta

20

What do heart valves do?

Ensure unidirection blood flow through the heart

21

Where is the Atrioventricular Valve found

between the atria and ventricles

22

What is the purpose of the AV valve

Prevent backflow into the atria when ventricles contract

23

What is the purpose of the semiludar valve

Prevents backflow of blood into the ventricles

24

describe the cardiac muscle

one or two nuclei, striated and branched

25

How is the heart muscle simulated

Simulated by nerves and self excitable

26

How does the heart contract

The heart contracts either as a unit or not at all
(all or nothing)

27

What are the 3 phases for an action potental in the heart

Depolarization
Platuea
Repolarization