Question:
Which one of the following statements is correct?
Which one of the following statements is correct?
Updated On: May 1, 2026
- 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 correct statement from the given options is: "Blood moves freely from atrium to the ventricle during joint diastole."
The process works as follows:
- Joint Diastole: During this phase, both atria and ventricles are in a relaxed state, leading to the opening of the atrioventricular valves (the tricuspid and bicuspid/mitral valves).
- Blood Flow: As a result of the lower pressure in the ventricles compared to the atria, blood flows passively from the atria into the ventricles.
- Role of Semilunar Valves: During joint diastole, the semilunar valves (located between the ventricles and the arteries) remain closed to prevent the backflow of blood from the arteries into the ventricles.
This statement accurately reflects the physiological process during the cardiac cycle.
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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.