Question:

Which one of the following is a matching pair?

Updated On: Jul 27, 2022
  • Lubb - sharp closure of AV valves at the beginning of ventricular systole
  • Dup - sudden opening of semilunar valves at the beginning of ventricular diastole
  • Pulsation of the radial artery - valves in the blood vessels
  • Initiation of the heart beat - Purkinje fibres
Hide Solution
collegedunia
Verified By Collegedunia

The Correct Option is A

Solution and Explanation

The gradually increasing contraction of ventricular muscles during systole first causes the closure of bicuspid and tricuspid valves (AV valves), producing a lowpitched "lubb" sound. Later, it causes the opening of the semilunar valves of systemic and pulmonary aorta. At the end of ventricular systole, semilunar valves shut, producing the second, louder heart sound, the "dup". Thus each heart beat is accompanied by a "lubb-dup" sound.
Was this answer helpful?
0
0

Top Questions on Circulatory Pathways

View More Questions

Questions Asked in AIIMS exam

View More Questions

Concepts Used:

Circulatory Pathways

Virtually every cell, tissue, organ, and system in the body is impacted by the circulatory system.

  1. 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.
  2. 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.
  3. 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.
  4. 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.