9.2 CVS 1

Question 1

What nerve fibres is the heart supplied by?
location?
formation?

Answer 1

The heart is supplied by autonomic plexus nerve fibers from the cardiac plexus
-Located at the base of heart
-Formed by both sympathetic
and parasympathetic fibers

Question 2

Where is the SA node?
-sinuatrial, pacemaker

function?

Answer 2

At the junction of SVC and R atrium

Generate electrical signals across atria, simulating AV node

Question 3

Where is the Atrioventricular (AV) node?

function?

Answer 3

In R atrium
Near the opening of coronary sinus and close to the cusps of the tricuspid valves
Distribute electrical signals to ventricles via AV bundles

Question 4

Feature of the aortic valve

Answer 4

distinguishing the aortic valve and the pulmonary valve
the right and left coronary artery only present in the aortic valve

middle region aorta

Question 5

Describe the pulmonary valve and aortic valve

Answer 5

3 semilunar valves
no additional structures, eg chordinae tendinae
valves passively opening and closing following pressure gradients

Question 6

anterior AV sulcus

Answer 6

R ventricle R atrium

Question 7

anterior interventricular sulcus

Answer 7

R ventricle L ventricle

Question 8

What is serous pericardium comprised of?

Answer 8

parietal + visceral

Question 9

What is the pericardial cavity?

Answer 9

a potential space between the parietal and visceral layers of serous pericardium
• contains a small amount of fluid, providing a frictionless environment

Question 10

what is the Pericardium composed of?

Answer 10

a fibrouserous membrane
• covers the heart and the great vessel roots
• composed of 2 layers
• Fibrous pericardium continues with the central tendon of the diaphragm
• Serous pericardium

Question 11

what is the pericardial sac composed of?

Answer 11

=fibrous pericardium+serous pericardium