Practice question
Question
Which of the following is known as the pacemaker of heart?
Explanation
SA node located at junction of superior vena cava and right atrium spontaneously depolarizes fastest, around 70 beats per minute. Its action potentials propagate via atrial muscle to AV node, then Purkinje system. Autonomic inputs modulate rhythm, establishing SA node as natural pacemaker.
Related blogs
Guides and insights connected to this topic
Body Fluids and Circulation Biology Notes - Blood, Blood Groups, Heart, Cardiac Cycle, ECG, Double Circulation and Disorders
Overview of circulatory systems, heart chambers across vertebrates, single vs double circulation, blood groups and ECG basics.
Fat Cells (Adipocytes): Types, Structure, Functions and Disorders
Learn about fat cells (adipocytes), their types, structure, functions in energy storage and hormone secretion, and links to obesity-related disorders.
About Alternaria alternata
Introduction to Alternaria spp.Alternaria spp. (a group of Ascomycete fungi) are known for their saprophytic nature, thriving in decomposing...
Discussion
Comments
Please log in to join the discussion.
Login to commentNo comments yet. Be the first to start the discussion.