Question:
Which one of the following statements is correct?
Which one of the following statements is correct?
Updated On: Jul 21, 2024
- The atrioventricular node (AVN) generates an action potential to stimulate atrial contraction
- The tricuspid and the bicuspid valves open due to the pressure exerted by the simultaneous contraction of the atria
- Blood moves freely from atrium to the ventricle during joint diastole
- Increased ventricular pressure causes closing of the semilunar valves
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The Correct Option is C
Solution and Explanation
The Sino-atrial node generates new action potential. With the decline of ventricular pressure, the tricuspid and bicuspid valves are pushed open by the pressure in the atria exerted by the blood which was being emptied into them by the veins. Joint diastole refers to the phase in the cardiac cycle of the heart when both atria and ventricles are relaxed. During joint diastole, blood is poured into the left and right atria. Due to this filling of blood, atrioventricular valves (Bicuspid and Tricuspid valves) open and allow blood to flow from atria to ventricles. During ventricular diastole, the ventricular pressure falls causing the closure of semilunar valves and this prevents the backflow of blood into the ventricles.
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Concepts Used:
Circulatory Pathways
Virtually every cell, tissue, organ, and system in the body is impacted by the circulatory system.
- Digestive - Absorbs nutrients and water; delivers nutrients (except most lipids) to liver for processing by hepactic portal vein; provides nutrients essential for hematopoiesis and building hemoglobin.
- Endocrine - Delivers hormones: atrial natriuretic hormone (peptide) secreted by the heart atrial cells to help regulate blood volumes and pressures; epinephrine, ANH, angiotensin II, ADH, and thyroxine to help regulate blood pressure; estrogen to promote vascular health in women and men.
- Integumentary - Carries clotting factors, platelets, and white blood cells for homeostatis, fighting infection, and reparing damage; regulates temperature by controlling blood flow to the surface, where heat can be dissipated; provides some coloration of integument; acts as a blood reservoir.
- Muscular - Provides nutrients and oxygen for contraction; removes lactic acid and distributes heat generated by contraction; muscular pumps aid in venous return; exercise contributes to cardiovascular health and helps to prevent atherosclerosis.