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  2. Heart rate - Wikipedia

    en.wikipedia.org/wiki/Heart_rate

    Heart rate is the frequency of the heartbeat measured by the number of contractions of the heart per minute (beats per minute, or bpm). The heart rate varies according to the body's physical needs, including the need to absorb oxygen and excrete carbon dioxide. It is also modulated by numerous factors, including (but not limited to) genetics ...

  3. Heart sounds - Wikipedia

    en.wikipedia.org/wiki/Heart_sounds

    First heart sound: caused by atrioventricular valves – Mitral (M) and Tricuspid (T). Second heart sound caused by semilunar valves – Aortic (A) and Pulmonary/Pulmonic (P). Heart sounds are the noises generated by the beating heart and the resultant flow of blood through it. Specifically, the sounds reflect the turbulence created when the ...

  4. 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 of the circulatory system. [ 1 ] The pumped blood carries oxygen and nutrients to the body, while carrying metabolic waste such as carbon dioxide to the lungs. [ 2 ]

  5. Here Are Cardiologist-Approved Ways to Lower Your Resting ...

    www.aol.com/cardiologist-approved-ways-lower...

    Take your pulse on the inside of your wrist, on the thumb side. Use the tips of your first two fingers (not your thumb) and press lightly over the artery. Count your pulse for 15 seconds and ...

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

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

    “When the heart doesn't beat properly, it can't pump blood effectively. When this happens, the lungs, brain and all other organs can't work properly and may shut down or be damaged,” Dr. Mehta ...

  7. Can Dehydration Cause Heart Palpitations and Racing ... - AOL

    www.aol.com/dehydration-cause-heart-palpitations...

    Heart palpitations are an unpleasant awareness of the heart beating, often described as a "racing" or "flopping" feeling in the chest. While common and not usually dangerous, heart palpitations ...

  8. Cardiac cycle - Wikipedia

    en.wikipedia.org/wiki/Cardiac_cycle

    The cardiac cycle is the performance of the human heart from the beginning of one heartbeat to the beginning of the next. [1] It consists of two periods: one during which the heart muscle relaxes and refills with blood, called diastole, following a period of robust contraction and pumping of blood, called systole. [1]

  9. Cardiac muscle - Wikipedia

    en.wikipedia.org/wiki/Cardiac_muscle

    Cardiac muscle. Cardiac muscle (also called heart muscle or myocardium) is one of three types of vertebrate muscle tissues, the others being skeletal muscle and smooth muscle. It is an involuntary, striated muscle that constitutes the main tissue of the wall of the heart. The cardiac muscle (myocardium) forms a thick middle layer between the ...

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