Activity 3: Coronary Circulation
Does the contained blood inside the heart chambers nourish the myocardium?
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
Where does the functional blood supply of the heart come from then? (Hint: 2 sets of arteries)
Right and left coronary arteries
What are the 2 branches of the right coronary artery?
1. Right marginal artery
2. Posterior interventricular artery
The right marginal artery supplies what side of the heart?
Lateral right side of the heart
The posterior interventricular artery supplies what 2 regions of the heart?
1. Posterior walls of the ventricles
2. Posterior portion of the interventricular septum
What are the 2 branches of the left coronary artery?
1. Anterior interventricular artery
2. Circumflex artery
The anterior interventricular artery supplies what 2 regions of the heart?
1. Anterior portion of the interventricular spetum
2. Anterior walls of both ventricles
The circumflex artery supplies what 2 regions of the heart?
1. Left atrium
2. Posterior portion of the left ventricle
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
The great cardiac vein drains what 2 anterior regions of the heart?
1. Anterior left ventricle
2. Anterior right ventricle
The middle cardiac vein drains what 2 posterior regions of the heart?
1. Posterior right ventricle
2. Posterior left ventricle
The small cardiac vein drains what part of the heart?
Lateral right ventricle
The great, middle, and small cardiac veins all drain into which coronary vein?
The coronary sinus drains what part of the heart?
The entire heart
The anterior cardiac veins drain directly into which chamber of the heart?
The auricles cover what 2 parts of the heart?
Right and left atria
What tissue is the balance of the heart muscle?
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.
What is the first branching of the aorta?
The ligamentum arteriosum is a cordlike remnant of what structure?
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.
What is the cordlike ridges of muscle throughout most of the right atrium called?
The fossa ovalis marks the site of what opening in the fetal heart?
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.
The ridged and pitted muscle located in the ventricles are called what?
The moderator band connects what 2 structures of the heart?
1. Interventricular septum
2. Anterior papillary muscles
The moderator band is a bundle of what type of fibers?
Cardiac muscle fibers
What is the function of the moderator band?
Coordinate contraction of the ventricle.
Is the myocardium of the left ventricle thicker than that of the right's?
Identify the blanks.
Identify the blanks.