What is the primary role of the left ventricle in the circulatory system?
To pump blood to the lungs for oxygenation
To receive deoxygenated blood from the body
To regulate heart rhythm
To pump oxygenated blood into systemic circulation
The Correct Answer is D
A. To pump blood to the lungs for oxygenation:
The right ventricle pumps deoxygenated blood to the lungs. The left ventricle is responsible for systemic circulation.
B. To receive deoxygenated blood from the body:
The right atrium receives deoxygenated blood from the systemic veins.
C. To regulate heart rhythm:
Heart rhythm is controlled by the SA and AV nodes and the conduction system, not the ventricles themselves.
D. To pump oxygenated blood into systemic circulation:
The left ventricle has thick muscular walls that generate the high pressure needed to pump oxygen-rich blood through the aorta and systemic arteries to the entire body. Dysfunction leads to decreased perfusion and signs of left-sided heart failure.
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Related Questions
Correct Answer is A
Explanation
A. To contract and generate force for blood circulation:
The myocardium is the muscular layer of the heart wall responsible for contracting and generating pressure to circulate blood through the systemic and pulmonary circuits. Its thickness varies by chamber, with the left ventricle being the thickest due to the higher pressure required to pump blood systemically. Dysfunction in the myocardium leads to heart failure or arrhythmias.
B. To produce pericardial fluid:
The pericardium, not the myocardium, secretes pericardial fluid to reduce friction during cardiac movement. Confusing these structures may lead to misunderstanding cardiac physiology.
C. To protect the heart from external injury:
Protection is primarily provided by the pericardium and thoracic cage. The myocardium’s main role is mechanical contraction, not external protection.
D. To facilitate the electrical conduction in the heart:
Electrical conduction is carried out by specialized nodes and fibers (SA node, AV node, bundle of His, Purkinje fibers). The myocardium responds to these signals but does not generate the primary conduction itself.
Correct Answer is B
Explanation
A. It regulates blood pressure:
Pericardial fluid does not directly regulate blood pressure. Blood pressure is controlled by cardiac output, vascular resistance, and fluid volume.
B. It reduces friction between the heart and surrounding tissues during contraction:
The pericardial sac contains pericardial fluid, which acts as a lubricant, allowing the heart to beat smoothly within the thoracic cavity. This prevents friction and mechanical injury to the heart and surrounding structures during systole and diastole.
C. It facilitates electrical conduction within the heart:
Electrical conduction is mediated by the SA node, AV node, bundle of His, and Purkinje fibers, not pericardial fluid.
D. It nourishes the heart muscle:
The myocardium is nourished by the coronary arteries, not by pericardial fluid.
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