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Question:
Impulse of heart beat originates from
Impulse of heart beat originates from
Updated On: Aug 1, 2022
- SA node
- AV node
- vagus nerve
- cardiac nerve
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The Correct Option is A
Solution and Explanation
SA node (Sino Artial node) is a group of specialized cardiac muscle cells which have the property of generating rhythmic excitatory waves. It is also called pacemaker of the heart as it generates the wave for all the chambers of heart to contract.
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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.
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