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  1. studymind.co.uk › notes › controlling-heart-rateControlling Heart Rate (A-level Biology) - Study Mind

    The sinoatrial (SA) node is responsible for initiating the electrical impulses that control the contraction of the heart. It acts as the natural pacemaker for the heart and determines the heart rate.

  2. en.wikipedia.org › wiki › Cardiovascular_centreCardiovascular centre - Wikipedia

    The cardiovascular centre affects changes to the heart rate by sending a nerve impulse to the cardiac pacemaker via two sets of nerves: sympathetic fibres, part of the autonomic nervous system, to make heart rate faster.

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  4. pmc.ncbi.nlm.nih.gov › articles › PMC4404375Autonomic and endocrine control of cardiovascular function

    Sympathetic nervous system control and heart function: Stimulation by the sympathetic nervous system results in the following effects on the heart (Table 1): Positive chronotropic effect (increase in heart rate): The sinoatrial (SA) node is the predominate pacemaker of the heart. It is located within the upper posterior wall of the right atrium ...

  5. my.clevelandclinic.org › health › bodyFunction of the Heart's Electrical System - Cleveland Clinic

    Mar 17, 2022 · The sinoatrial (SA) node is a cluster of cells that act as a natural pacemaker for your heart. The SA node is located in a wall of the right atrium of your heart. This step is where the upper chambers of the heart begin to squeeze.

  6. www.healthlinkbc.ca › electrical-system-heartElectrical System of the Heart - HealthLink BC

    The cells of the SA node at the top of the heart are known as the pacemaker of the heart because the rate at which these cells send out electrical signals determines the rate at which the entire heart beats (heart rate). The normal heart rate for an adult at rest ranges between about 60 and 100 beats per minute.

  7. med.libretexts.org › Bookshelves › Anatomy_and18.6A: Role of the Cardiovascular Center - Medicine LibreTexts

    Key Points. The cardiovascular center is a part of the human brain found in the medulla oblongata, responsible for regulation of cardiac output. Numerous receptors in the circulatory system can detect changes in pH or stretch and signal these changes to the cardiovascular center.

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  9. teachmephysiology.com › cardiovascular-systemControl of Heart Rate - Cardiac Output - TeachMePhysiology

    Jul 16, 2023 · The postganglionic fibres release noradrenaline, which acts on B1 adrenoreceptors to increase the slope of the pacemaker potential. This increases the heart rate (a positive chronotropic effect), as well as the force of contraction (positive inotropic effect).