The blood away which carry the bright red oxygenated blood away from the heart are called arteries. The large arteries, which receive the blood directly from form the heart, branch repeatedly until every part of the body is served by one or more of them.
The blood returns from all parts of the body to the heart through veins. There are many more veins than arteries throughout the body. The veins gradually unite to form larger veins as they approach the heart.
When the blood is sent out over the body through the arteries it passes into the capillaries in which the arteries end. The capillaries are tiny hairlike blood vessels forming a network throughout the body. The tissue is so well supplied with capillaries that even a pinprick is likely yo break some of them and result in the appearance of a few drops of blood.
When an artery, vein, or capillary is broken or cut, blood flows the broken vessels. Usually the blood flow the broken blood vessels is stopped by the formation of a clot in the end of the broken vessels. Bleeding from a large artery comes in serious. The blood from a served artery is extremely serious. The blood from a served artery comes in spurts. There is a smooth flow of blood from veins.
The pumping action of the heart ceases only with death. Ay and night, year after year, it continues to work in pumping the blood throughout the body. It can rest only by pumping more slowly or less powerfully.
The heart is a hollow, pear-shaped muscular organ located just slightly to the left of the midline of the body in the chest cavity. It can be located easily by the sound of the heartbeat or the feeling of its contraction through the skin and muscle that lie over it.
At birth the heart beats about 130 times a minute, at six years it beats 100 times a minute, at ten years about 90, and at fifteen years about 85. The approximate normal heart rate among adults ranges from 65 to 80 betas per minute. During a lifetime the heart beats 2,500,000,000 times and pumps a total of nearly 15,000,000 gallons.
The impulse which causes the heart to contract develops in some nerve tissue which is called the peacemaker of the heart. An attempt to measure this impulse indicates that its energy is the equivalent of one-thousandth of a volt.
The blood from all parts of the body empties into the heart through large veins. Then it is sent through the lungs, where it acquires a new supply of oxygen. The blood the returns to the heart from the lungs. When the heart muscle contracts, the blood is forced out the heart, then goes by away of the large arteries and capillaries to the farthest extremes of the body.
The heart moves a total of five hundred gallons of blood a day. Since there are about six quarts of blood in the whole body, the heart moves the same fluid, slightly modified chemically as it travels about, over and over again
How Is Allergy Produced, Role Of Contact Previous contact with or to a substance is necessary in order for a person to develop allergy to that substance. Such contact is not always easily demonstrable. For example, one may question the occurrence of previous contact in the case of baby who develops hives, eczema, or asthma upon ingesting cow milk for the first time. However, it may be demonstrated that the contact which produced sensitivity occurred before the baby as bon and was caused by enough the placental circulation. That contact plays a role in the development of allergy is demonstrated by the fact that allergic individuals living in Europe where there is no ragweed pollen never develop sensitivity to this pollen. In the same way there is no sensitivity to poison ivy among Eskimos who are not exposed to poison ivy.
Cerebral Palsy Definition Sign and Treatment Cerebral Palsy Definition
Cerebral palsy (CP) is an umbrella term encompassing a group of non-progressive, non-contagious motor conditions that cause physical disability in human development, chiefly in the various areas of body movement.
Symptoms of endometriosis Are you looking for symptoms of endometriosis? here is some good article about symptoms of endometriosis.
Ten percent of women will develop endometriosis, characterized by the presence of endometrial tissue at sites outside the uterine cavity. The ectopic endometrial cells cause cyclical dysmenorrhea. The most common sites are the ovaries, posterior cul-de-sac, uterosacral ligaments, posterior broad ligament, and anterior cul-de-sac. The uterine serosa, rectovaginal septum, cervix, vagina rectosigmoid, and bladder are less frequent locations.
Gastroenteritis Symptoms in Children If gastroenteritis in a child is severe enough to require admission to a hospital, then it is important to distinguish between bacterial and viral infections. Bacteria, Shigella and Campylobacter, for example, and parasites like Giardia can be treated with antibiotics.
A child with gastroenteritis may be lethargic, suffer lack of sleep, run a low fever, have signs of dehydration (which include dry mucous membranes), tachycardia, reduced skin turgor, skin color discoloration, sunken fontanelles, sunken eyeballs, darkened eye circles, glassy eyes, poor perfusion and ultimately shock.
Causes, Control and Prevention of Heat Stress Although human beings process considerable ability to compensate for naturally occurring heat stress, many occupational environments and/or physical activities expose worker to heat loads which are so excessive as to threaten their health and productivity. Many varieties of techniques can be used to minimize the incidence of heat disorders and reduce the severity of cases when they do occur. Interventions fall into five categories: maximizing heat tolerance among exposed individuals, assuring timely replacement of lost fluid and electrolytes, altering work practice to reduce exertion heat load, engineering control of climatic conditions, and use of protective clothing.
Factors outside the worksite which may affect thermal tolerance should not be ignored in the evaluation of the extent of exposure and consequently in elaborating preventive strategies. For example, total physiological burden and the potential susceptibility to heat disorders will be much higher if heat stress continues during off-duty hours thought work at second jobs, strenuous leisure activities, or living in unremittingly hot quarters. In addition, nutritional status and hydration may reflect patterns of eating and drinking, which may also change with season or religious observances.
Maximizing Individual Heat Tolerance
Teenage Acne Treatment Girls Are you looking for teenage acne treatment for girls? Acne is caused when a hair follicle get clogged with an oil called sebum and skin cells. Skin bacteria thrive and multiply in sebum, causing inflammation. Some acne consists of simple blackheads and whiteheads. Inflammation within the pore causes a pimple (also called a “papule”) or a pus-filled pimple (“pustule”), depending on how deep it is. If it’s really deep, it can cause a painful cyst and scarring.
Syphilis types symptoms and treatment Syphilis, the other well-known sexually transmitted disease, is also caused by a bacterial organism, the spirochete known as Treponema pallidum. Because it s extremely delicate and dies readily upon exposure to air, dryness, or cold, the organism is generally transferred only through direct sexual contact. Typically, this means contact between sexual organs during intercourse, but in rare instances, the organism enters the body through a break in the skin, through deep kissing in which body fluids are exchanged, or through some other transmission of body fluids.
Hiatus Hernia Treatment The term hiatus hernia describes diaphragmatic hernia or weakness in the diaphragm, the horizontal muscular wall separating the organs of the chest from the organs of the abdomen. A hernia is an abnormal protrusion of an organ or tissue through an opening. A hiatus, or opening, permits the esophagus to carry food from the mouth to the stomach. Blood vessels and nerves also pass through the diaphragm. The diaphragm is an important group of muscles for contracting and expanding the lungs, forcing air in and out of the lung tissues.
Causes of Asthma and Diet for Treatment Asthma is a disease that affects the bronchial tubes leading to our
lungs, resulting in periods of wheezing and shortness of breath. Not only has
the number of asthma sufferers escalated worldwide, but recent research has
indicated that more than 10% of South Africans are affected and that it is
definitely the most common of the chronic childhood illnesses. Pollution from
traffic fumes is without doubt a contributing factor, as during school holidays
incidences of attacks are reduced as there is less traffic.
Other atmospheric pollutants such as pollen, cigarette smoke and car exhaust
fumes can all be triggers. The incidence of occupational asthma is also high in
this country, caused by contact with airborne particles e.g. flour, soap powder
and paint. Even stressful situations and chronic exhaustion can trigger an
attack as can eating foods to which you have a sensitivity (such as sulphur
dioxide, used as a preservative in many dried fruit). You can also suffer
exercise-induced asthma. People who take paracetamol every day are twice as
likely to suffer asthma, and if you take it twice weekly you are 80% more likely
to be affected.
Gluten intolerance symptoms in children Are you looking for gluten intolerance symptoms in children? Gluten is composed of the sticky storage proteins found in wheat. Gluten-sensitive enteropathy (GSE) can range from mild inflammation of the mucosa of the small intestine to severe coeliac disease. The term gluten-sensitive is applicable when a probable diagnosis of GSE is made based on conditions such as dermatitis herpetiformis. However, GS may be used as the diagnosis in ambiguous situations when other conditions may be possible. For example, wheat allergies to gluten can result in anaphylaxis while others may be difficult to diagnose because of some of the cryptic inflammatory properties of wheat proteins. The term 'gluten sensitivity' is typically applied when diagnostic testing is not done because of prolonged gluten-free diet and/or refusal of gluten-challenge prior to biopsy. The gluten-sensitive designation may not be appropriate in all cases, as wheat allergies are often directed toward albumins or globulins of wheat, or the person may have a sensitivity to proteins commonly found with wheat products (e.g. fungal amylase or bread-yeast mannins). Therefore diagnostic criteria are preferred. The relationship between gluten and these various sensitivities is complex. For gluten enteropathy, T-cell reactivity is almost entirely restricted to prolamin-glutelin/species within the grass tribe Triticeae, and especially α-gliadins of wheat. For a tiny minority of GSE, inflammatory responses may extend to cover oats. Gluten allergies may extend over wide taxa or may be specific to certain wheat proteins and allergies may include oats.
Best Eye Surgery Hospitals Are you looking for best eye surgery hospitals?
Eye surgery, also known as orogolomistician surgery or ocular surgery, is surgery performed on the eye or its adnexa, typically by an ophthalmologist.
Menstrual Disorders (Amenorrhea) Among the health concerns of women that specifically belong to gynecology are menstrual disorders. Normally, the first menstrual period (menarche) occurs about age 12 or 13, or sometimes earlier or later. Periods are generally irregular for the first year or two, and then they tend to recur at intervals of 24 to 32 days. Each period begins about two weeks after ovulation, or the release of an egg cell (ovum) from the ovary—unless, of course, the ovum happens to be fertilized in the interval and pregnancy interrupts the whole process.
The menstrual flow, which lasts from three to seven days, is composed mainly of serum, mucus, and dead cells shed from the lining (endometrium) of the uterus. The loss of blood is minimal, usually from two to four ounces. The volume of flow, as well as the time schedule, tends to be fairly regular for most women. When one’s menstrual pattern varies noticeably from the expected pattern, and in the absence of pregnancy, it may be assign of a physical or emotional disorder.