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  2. Cardiac excitation-contraction coupling - Wikipedia

    en.wikipedia.org/wiki/Cardiac_excitation...

    The main pumps involved are: the sarcoplasmic reticulum Ca 2+-ATPase, which pumps Ca 2+ back into the SR, the Sarcolemmal sodium-calcium exchanger, which pumps one Ca 2+ out of the cell, in exchange for 3 sodium ions being pumped into the cell, the Sarcolemmal Ca 2+-ATPase, which uses ATP to pump Ca 2+ directly out of the cell and the ...

  3. Cardiac action potential - Wikipedia

    en.wikipedia.org/wiki/Cardiac_action_potential

    Ionic pumps as discussed above, like the sodium-calcium exchanger and the sodium-potassium pump restore ion concentrations back to balanced states pre-action potential. This means that the intracellular calcium is pumped out, which was responsible for cardiac myocyte contraction. Once this is lost, the contraction stops and the heart muscles relax.

  4. Cardiac conduction system - Wikipedia

    en.wikipedia.org/wiki/Cardiac_conduction_system

    A slow heart rate of 60 or less beats per minute is defined as bradycardia. A fast heart rate of more than 100 beats per minute is defined as tachycardia. An arrhythmia is defined as one that is not physiological such as the lowered heart rate that a trained athlete may naturally have developed; the resting heart rates may be less than 60 bpm.

  5. Cardiac physiology - Wikipedia

    en.wikipedia.org/wiki/Cardiac_physiology

    Cardiac physiology or heart function is the study of healthy, unimpaired function of the heart: involving blood flow; myocardium structure; the electrical conduction system of the heart; the cardiac cycle and cardiac output and how these interact and depend on one another.

  6. Cardiac cycle - Wikipedia

    en.wikipedia.org/wiki/Cardiac_cycle

    The heart is a four-chambered organ consisting of right and left halves, called the right heart and the left heart. The upper two chambers, the left and right atria , are entry points into the heart for blood-flow returning from the circulatory system , while the two lower chambers, the left and right ventricles , perform the contractions that ...

  7. Are you neglecting your 'second heart'? 1 step to ... - AOL

    www.aol.com/news/neglecting-second-heart-1-step...

    The heart gets an assist from another pump in blood circulation. Called the "second heart," it only starts pumping when legs move. ... How to activate the ‘second heart’ with 1 step.

  8. Cardiac pacemaker - Wikipedia

    en.wikipedia.org/wiki/Cardiac_pacemaker

    An artificial cardiac pacemaker (or artificial pacemaker, so as not to be confused with the natural cardiac pacemaker) or just pacemaker is an implanted medical device that generates electrical impulses delivered by electrodes to the chambers of the heart either the upper atria, or lower ventricles to cause the targeted chambers to contract and ...

  9. Doctors combine a pig kidney transplant and a heart device in ...

    www.aol.com/news/doctors-combine-pig-kidney...

    This week, the 54-year-old grasped a walker and took her first few steps. ... But while on dialysis, she didn't qualify for a heart pump, called a left ventricular assist device or LVAD, either.

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