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Questions and Answers
What is the primary function of the fibrous pericardium?
What is the primary function of the fibrous pericardium?
- Separates the atria and ventricles
- Facilitates blood flow to the heart
- Lubricates the heart's surfaces
- Prevents overstretching of the heart (correct)
Which layer of the heart wall is responsible for pumping blood?
Which layer of the heart wall is responsible for pumping blood?
- Epicardium
- Endocardium
- Myocardium (correct)
- Pericardium
How do intercalated discs benefit cardiac muscle cells?
How do intercalated discs benefit cardiac muscle cells?
- Enhance rapid transfer of electrical impulses (correct)
- Allow for nutrient exchange with blood
- Cause the heart to quiver
- Provide structural support to the heart
What is the role of the chordae tendineae in the heart?
What is the role of the chordae tendineae in the heart?
Which valve prevents backflow of blood into the left atrium?
Which valve prevents backflow of blood into the left atrium?
What separates the right and left atria in the heart?
What separates the right and left atria in the heart?
Which chamber of the heart is the most muscular and pumps blood throughout the body?
Which chamber of the heart is the most muscular and pumps blood throughout the body?
What is contained within the pericardial cavity?
What is contained within the pericardial cavity?
Which structure prevents blood from flowing back into the ventricles from the aorta and pulmonary artery?
Which structure prevents blood from flowing back into the ventricles from the aorta and pulmonary artery?
What type of cells comprise the endocardium?
What type of cells comprise the endocardium?
Flashcards
Pericardium Layers
Pericardium Layers
Protective covering around the heart with three layers: fibrous, parietal, and visceral (epicardium).
Myocardium
Myocardium
Thick middle layer of the heart wall; the actual contracting muscle.
Intercalated Discs
Intercalated Discs
Special connections between cardiac muscle cells that allow rapid electrical signal transmission.
Atria
Atria
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Ventricles
Ventricles
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Tricuspid Valve
Tricuspid Valve
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Mitral (Bicuspid) Valve
Mitral (Bicuspid) Valve
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Chordae Tendineae
Chordae Tendineae
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Papillary Muscles
Papillary Muscles
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Semilunar Valves
Semilunar Valves
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Study Notes
Pericardium
- A loose-fitting covering around the heart, protecting it from trauma and infection
- Composed of three layers:
- Fibrous pericardium: tough, inelastic fibrous connective tissue, preventing overstretching and anchoring the heart in place
- Parietal pericardium: serous membrane lining the fibrous pericardium
- Visceral pericardium (epicardium): serous membrane on the heart's surface
Pericardial Cavity
- Space between the visceral and parietal layers
- Contains pericardial fluid (5-10 ml), lubricating heart surfaces and preventing friction
Layers of the Heart Wall
- Endocardium: innermost layer, covering heart valves and chambers
- Myocardium: middle, thickest layer, responsible for pumping blood
- Epicardium (visceral pericardium): outermost layer, thin and transparent
Special Feature of the Myocardium
- Intercalated discs: specialized cell-to-cell connections in cardiac muscle cells, facilitating rapid electrical impulse transfer
Chambers of the Heart
- Heart with two atria (upper chambers) and two ventricles (lower chambers)
- Atria receive blood from veins, ventricles pump blood
- Separated by septums:
- Interatrial septum: between atria
- Interventricular septum: between ventricles
Four Chambers
- Right atrium: thin-walled, receives deoxygenated blood from the body (via superior and inferior vena cava)
- Right ventricle: receives blood from right atrium, pumps it to lungs via the pulmonary artery
- Left atrium: receives oxygenated blood from the lungs (via pulmonary veins)
- Left ventricle: receives blood from left atrium, pumps it to the body via the aorta (largest artery)
Valves of the Heart
- Atrioventricular (AV) valves: located between atria and ventricles, prevent backflow
- Tricuspid valve (right AV valve): three cusps
- Mitral valve (left AV valve): two cusps
- Semilunar valves: located at the bases of the major arteries leaving the heart, prevent backflow into ventricles
- Pulmonary semilunar valve
- Aortic semilunar valve
Chordae Tendineae and Papillary Muscles
- Chordae tendineae: fibrous cords connecting AV valve cusps to papillary muscles
- Papillary muscles: cardiac muscle projections in ventricles, contract and pull on chordae tendineae to keep AV valves from inverting during contraction
Semilunar Valves
- Half-moon shaped flaps in pulmonary artery and aorta, preventing blood from flowing back
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