CIRCULATORY SYSTEM PT 1 - HEART Flashcards Preview

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Flashcards in CIRCULATORY SYSTEM PT 1 - HEART Deck (59)
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1

Describe the size/positioning/inferior attachment of the Heart.

- Size of a fist
- Middle of the mediastinum with 2/3rds of mass on the left
- Attached to diaphragm inferiorly

2

The inferior portion of the heart is called?

Apex

3

The superior portion of the heart is called?

Base

4

Define Mediastinum.

Mass of organs between Lungs

5

Name the structures that border the Mediastinum.

Superior: 1st rib
Inferior: Diaphragm
Anterior: Sternum
Posterior: Vertebrae

6

What are the structures that make up the Mediastinum?

Trachea
Esophagus
Thymus/Lymph Nodes
Heart

7

What is Pericardium? Name the layers.

A two-layered CT membrane surrounding Heart
Fibrous and Serous

8

Describe Fibrous Pericardium.

A inelastic, dense irregular CT holding Heart in place and allows movement

9

Describe Serous Pericardium.

Deep to Fibrous, forming a double layer around Heart

10

Describe the Parietal Layer of the Serous Pericardium.

Outer layer fused to Fibrous Pericardium

11

Describe the Visceral Layer of the Serous Pericardium.

aka. Epicardium
Inner layer attached to Heart muscle

12

What is the Pericardial Cavity?

Space between the Parietal and Visceral layer filled with pericardial fluid to reduce friction

13

Name the layers that make up the Hearts walls. From superficial to deep.

Epicardium
Myocardium
Endocardium

14

Describe the Epicardium layer.

aka. Visceral layer of Serous Pericardium
Outer layer of simple squamous epithelium and CT with a smooth, slippery texture

15

Describe the Myocardium layer.

Cardiac muscle tissue - site of contractions

16

Describe the Endocardium layer.

Deep layer providing a smooth lining for chambers and valves

17

Describe Endothelium.

Simple squamous epithelium lining cavities of heart, blood and lymph vessels. Found in Endocardium layer

18

What is a Septa?

Dividing walls in heart

19

What does the Interatrial Septum divide?

Divides 2 Atria

20

What does the Interventricular Septum divide?

Divides 2 ventricles

21

What is the function of Veins?

Carry blood towards Heart

22

What is the function of Arteries?

Carry blood away from Heart

23

Explain the blood flow function of the Right Atrium.

- Receives blood from 3 veins
- Exits through the Tricuspid Valve (Right A-V Valve)
- Into the Right Ventricle

24

Name the 3 veins entering the Right Atrium.

Superior Vena Cava
Inferior Vena Cava
Coronary Sinus

25

Explain the blood flow function of the Right Ventricle.

- Receives blood from Right Atrium
- Ejects through Pulmonary Semilunar Valve
- Into the Pulmonary Trunk
- Suppling R and L Pulmonary Arteries (Lungs)

26

Explain the blood flow function of the Left Atrium.

- Receives blood from 4 veins (from lungs)
- Exits through Bicuspid/Mitral Valve (Left A-V Valve)
- Into the Left Ventricle

27

Explain the blood flow function of the Left Ventricle.

- Receives blood from Left Atrium
- Ejects through Aortic Semilunar Valve
- Into the Aorta and Coronary Arteries

28

What are Chordae Tendinae?

Tendon-like cords on the cusps of the AV Valves

29

What is the function of Papillary Muscles?

Prevents valves from opening in opposite direction

30

Explain the opening and closing of the Atrioventricular Valves (Tricuspid and Bicuspid Valves).

- Blood flow into the Atriums causes pressure which opens the AV Valves into the Ventricles.
- AV Valves closes when ventricles contract