Activity 3: Coronary Circulation

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1

Does the contained blood inside the heart chambers nourish the myocardium?

No

2

What are the 6 coronary arteries?

1. Right coronary artery (RCA)

2. Right marginal artery

3. Posterior interventricular artery

4. Left coronary artery (LCA)

5. Anterior interventricular artery

6. Circumflex artery

3

Where does the functional blood supply of the heart come from then? (Hint: 2 sets of arteries)

Right and left coronary arteries

4

What are the 2 branches of the right coronary artery?

1. Right marginal artery

2. Posterior interventricular artery

5

The right marginal artery supplies what side of the heart?

Lateral right side of the heart

6

The posterior interventricular artery supplies what 2 regions of the heart?

1. Posterior walls of the ventricles

2. Posterior portion of the interventricular septum

7

What are the 2 branches of the left coronary artery?

1. Anterior interventricular artery

2. Circumflex artery

8

The anterior interventricular artery supplies what 2 regions of the heart?

1. Anterior portion of the interventricular spetum

2. Anterior walls of both ventricles

9

The circumflex artery supplies what 2 regions of the heart?

1. Left atrium

2. Posterior portion of the left ventricle

10

What are the 5 cardiac veins?

1. Great cardiac vein

2. Middle cardiac vein

3. Small cardiac vein

4. Coronary sinus

5. Anterior cardiac veins

11

The great cardiac vein drains what 2 anterior regions of the heart?

1. Anterior left ventricle

2. Anterior right ventricle

12

The middle cardiac vein drains what 2 posterior regions of the heart?

1. Posterior right ventricle

2. Posterior left ventricle

13

The small cardiac vein drains what part of the heart?

Lateral right ventricle

14

The great, middle, and small cardiac veins all drain into which coronary vein?

Coronary sinus

15

The coronary sinus drains what part of the heart?

The entire heart

16

The anterior cardiac veins drain directly into which chamber of the heart?

Right atrium

17

The auricles cover what 2 parts of the heart?

Right and left atria

18

What tissue is the balance of the heart muscle?

Ventricular tissue

19

Why is the left ventricle thicker?

There is greater demand on the left ventricle. It must pump blood through the much longer systemic circuit, a pathway with much higher resistance than the pulmonary circuit.

20

What is the first branching of the aorta?

Brachiocephalic trunk

21

The ligamentum arteriosum is a cordlike remnant of what structure?

Ductus arteriosus

22

What is the function of the ductus arteriosus in the fetus?

In the fetus, it allows blood to pass from the pulmonary trunk to the aorta by bypassing the nonfunctional fetal lungs.

23

What is the cordlike ridges of muscle throughout most of the right atrium called?

Pectinate muscle

24

The fossa ovalis marks the site of what opening in the fetal heart?

Foramen ovale

25

What is the function of the foramen ovale in the fetal heart?

It allows blood to pass from the right to the left atrium, thus bypassing the fetal lungs.

26

The ridged and pitted muscle located in the ventricles are called what?

Trabeculae carneae

27

The moderator band connects what 2 structures of the heart?

1. Interventricular septum

2. Anterior papillary muscles

28

The moderator band is a bundle of what type of fibers?

Cardiac muscle fibers

29

What is the function of the moderator band?

Coordinate contraction of the ventricle.

30

Is the myocardium of the left ventricle thicker than that of the right's?

Yes

31
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