Walls Of The Heart

Question 1

Walls of heart composition

Answer 1

• epicardium, or visceral pericardium (outer)
• myocardium (mid)
• endocardium (inner)

Question 2

Covering of the walls

Answer 2

• fibrous pericardium

- serous pericardium

Question 3

Fibrous pericardium

Answer 3

• protects the heart
• anchors and recents over stretching
• outer layer

Question 4

Serous pericardium

Answer 4

• parietal (pericardium) and visceral (epicardium) layers

- serous fluid in between the two layers to keep a frictionless environment

Question 5

Pericarditis

Answer 5

• inflamed pericardium causing loss of serous fluid
• loss of fluid causes layers to stick together interfering with the heart’s movement
• can cause fluid accumulation in the pericardial cavity, compressing the heart

Question 6

Myocardium

Answer 6

• thick wall of cardiac muscle bundles twisted into rings
• forces out the blood out of heart chambers in wringing motion
• reinforced internally by DCT
• cells are linked together with intercalated discs at gap junctions to communicate rapidly (allowing ions to pass from cell to cell carrying a wave of excitement across the heart)

Question 7

Endocardium

Answer 7

• simple squamous epithelial Tissue lines the heart chambers and covers valves
• continuous with linings of blood vessels entering and leaving the heart
• helps blood flow smoothly