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  2. Cardiac cycle - Wikipedia

    en.wikipedia.org/wiki/Cardiac_cycle

    The section shows: 1) the opened ventricles contracting once per heartbeat—that is, once per each cardiac cycle; 2) the (partly obscured) mitral valve of the left heart; 3) the tricuspid and pulmonary valves of the right heart—note these paired valves open and close oppositely. + (The aortic valve of the left heart is located below the ...

  3. Heart rate - Wikipedia

    en.wikipedia.org/wiki/Heart_rate

    The American Heart Association states the normal resting adult human heart rate is 60–100 bpm. An ultra-trained athlete would have a resting heart rate of 37–38 bpm. [3] Tachycardia is a high heart rate, defined as above 100 bpm at rest. [4] Bradycardia is a low heart rate, defined as below 60 bpm at rest.

  4. Cardiac physiology - Wikipedia

    en.wikipedia.org/wiki/Cardiac_physiology

    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.

  5. Sinoatrial node - Wikipedia

    en.wikipedia.org/wiki/Sinoatrial_node

    9477. Anatomical terminology. [edit on Wikidata] The sinoatrial node (also known as the sinuatrial node, SA node or sinus node) is an oval shaped region of special cardiac muscle in the upper back wall of the right atrium made up of cells known as pacemaker cells. The sinus node is approximately 15 mm long, 3 mm wide, and 1 mm thick, located ...

  6. Heart development - Wikipedia

    en.wikipedia.org/wiki/Heart_development

    The human heart begins beating at a rate near the mother's, about 75-80 beats per minute (BPM). The embryonic heart rate (EHR) then accelerates linearly for the first month of beating, peaking at 165-185 BPM during the early 7th week, (early 9th week after the LMP).

  7. When Should You See a Doctor About Heart Palpitations ... - AOL

    www.aol.com/lifestyle/see-doctor-heart...

    If your heart is racing at more than 130 beats per minute for more than 10 minutes, your heart rate is less than 50 beats per minute or if the heartbeat is fast and erratic, then seek immediate ...

  8. Heart - Wikipedia

    en.wikipedia.org/wiki/Heart

    The heart is a muscular organ found in most animals. This organ pumps blood through the blood vessels. [1] Heart and blood vessels together make the circulatory system. [2] The pumped blood carries oxygen and nutrients to the tissue, while carrying metabolic waste such as carbon dioxide to the lungs. [3]

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

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

    How to activate the ‘second heart’ with 1 step Just walk — take a walking break as often as you can, but at least once or twice an hour, both experts say. “It’s to get that calf muscle ...

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