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Hace 3 días · Heart, organ that serves as a pump to circulate the blood. It may be as simple as a straight tube, as in spiders and annelid worms, or as complex as the four-chambered double pump that is the center of the circulatory system in humans, other mammals, and birds.
- The Editors of Encyclopaedia Britannica
- In humans, the heart is situated between the two lungs and slightly to the left of center, behind the breastbone. It rests on the diaphragm, the mu...
- The heart consists of several layers of a tough muscular wall, the myocardium. A thin layer of tissue, the pericardium, covers the outside, and ano...
- The pumping of the heart, or the heartbeat, is caused by alternating contractions and relaxations of the myocardium. These contractions are stimula...
- The rhythmic noises accompanying the heartbeat are called heart sounds. The two distinct sounds are heard, a low, slightly prolonged “lub” (first s...
Hace 4 días · Streaming, rent, or buy Where the Heart Is – Season 1: Currently you are able to watch "Where the Heart Is - Season 1" streaming on ITVX for free. 16 Episodes
- Marsha Thomason
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Hace 5 días · The heart is a muscular pumping organ located medial to the lungs along the body's midline in the thoracic region. The bottom tip of the heart, known as its apex, is turned to the left, so that about 2/3 of the heart is located on the body's left side with the other 1/3 on right.
Hace 3 días · “Novalee Nation, seventeen, seven months pregnant, thirty-seven pounds overweight–and superstitious about sevens–shifted uncomfortably in the seat of the old Plymouth and ran her hands down the curve of her belly.” If you love words, this first chapter promises to be an all-you-can-eat buffet. Here’s a sample:
Hace 2 días · The circulatory system is a system of organs that includes the heart, blood vessels, and blood which is circulated throughout the entire body of a human or other vertebrate.
Hace 5 días · Explore Innerbody's 3D anatomical model of the left auricle, a vital component of pumping blood within the heart. The left auricle, also known as the left atrial appendage (LAA), is a flap of heart wall on the anterior surface of the left atrium of the heart.
Hace 4 días · Heart rate, like other vital signs such as blood pressure and respiratory rate, change with age. In adults, a normal heart rate is between 60 and 100 bpm (normocardic), whereas it is higher in children. A heart rate below normal is called "bradycardia" (<60 in adults) and above normal is called "tachycardia" (>100 in adults).
