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
Symptoms of meningitis in adults Are you looking for symptoms of meningitis in adults?
Meningitis is inflammation of the protective membranes covering the brain and spinal cord, known collectively as the meninges. The inflammation may be caused by infection with viruses, bacteria, or other microorganisms, and less commonly by certain drugs. Meningitis can be life-threatening because of the inflammation's proximity to the brain and spinal cord; therefore the condition is classified as a medical emergency.
Many of the bacteria and viruses that cause meningitis are fairly common and associated with other routine illnesses. Bacteria and viruses that infect the skin, urinary system, gastrointestinal or respiratory tract can spread by the bloodstream to the meninges through cerebrospinal fluid, the fluid that circulates in and around the spinal cord.
Acute Leukemia Prognosis, Symptoms and Treatment Acute Leukemia is neoplastic disorders characterized by proliferation of immature hematopoietic
precursor cells in the bone marrow, and later in the peripheral blood and
other organs and tissues. If untreated, death usually occurs within six months
of diagnosis. Increase risk is associated with the following:
The Foetal Circulation To understand the foetal circulation, it must be appreciated that the foetus develops its own blood and that at no time does the foetal and maternal blood mix unless some pathological process is present. The foetus produces its own red and white blood corpuscles. During intrauterine life the foetal gastrointestinal and respiratory system are not functioning, so the maternal blood furnishes the necessary nutrients and oxygen through the placenta, which in this case acts as the organ of respiration.
Treatment Of Sleep Disorder Primary Insomnia
Relaxation therapies can be helpful in the treatment of chronic insomnia, hypnosis, meditation, deep breathing, and progressive muscle relaxation are effective. Success with these interventions requires a great deal of practice and motivation on the part of the client.
Biofeedback has been used with success in some clients. The use of biological variable, such a asectromyography, helps these clients increase sensitivity to their internal state of arousal.
Is smoking harmful during pregnancy Your smoking can kill your baby. And, if the baby does not die, your smoking can cause such significant brain and body damage that your child will never be able to function as a normal, healthy person.
The earliest effect of the smoking related to pregnancy is infertility. People who smoke are less likely to get pregnant that people who do not smoke. If you do get pregnant, there is a do related effect on miscarriage. The more cigarettes you smoke, the more likely you are to miscarry).
Pancreatic cancer life expectancy Are you looking for about pancreatic cancer life expectancy? Pancreatic cancer refers to a malignant neoplasm of the pancreas. The most common type of pancreatic cancer, accounting for 95% of these tumors is adenocarcinoma, which arises within the exocrine component of the pancreas. A minority arises from the islet cells and is classified as a neuroendocrine tumor. The symptoms that lead to diagnosis depend on the location, the size, and the tissue type of the tumor. They may include abdominal pain and jaundice (if the tumor compresses the bile duct).
Treacher Collins Syndrome Pictures Treacher–Collins syndrome (TCS), also known as Treacher-Collins–Franceschetti syndrome, or mandibulofacial dysostosis is a rare autosomal dominant congenital disorder characterized by craniofacial deformities, such as absent cheekbones.Treacher-Collins syndrome is found in about 1 in 10,000 births. In a number of cases a genetic origin is described.
This gene controls development of the bones and other structures of the head and neck. When the gene is faulty, the facial bones don't develop as they should in the womb and a baby is born with characteristic facial features. The extent of these abnormalities varies from person to person, but they often cause problems with hearing, breathing and eating.
Radiation Safety Principles and Standard
The International Commission on Radiological Protection (ICRP) has
proposed that following principles should guide the use of ionizing
radiation safety standard:
No practice involving exposures to radiation should be adopted unless it
produces sufficient benefit to the exposed individuals or society to offset
the radiation detriment it causes (the justification of practice)
In relation to any particular source within a practice, the magnitude of
individuals doses, the number of people exposed, and the likelihood on
incurring exposures where these are not certain to be received should all kept
as low as reasonably achievable (ALARA), economic and social factors being
taken into account. This procedure should be constrained by restrictions of
the doses to individuals (dose constraint), so as to limit the inequity likely
to result from the inherent economic and social judgments.
The exposure of individuals resulting from the combination of all the
relevant practices should be subject to dose limits, or to some control of
risk in the case of potential exposures. These are aimed at ensuring that no
individual is exposed radiation risks that are judged to be unacceptable from
these practices in any normal circumstances. Not all sources are susceptible
of control by action at the source and it is necessary to specify the sources
to be included as relevant before selecting a dose limit.
Lichen Sclerosus Lichen sclerosus is an atrophic, shrinking disease that usually occurs in postmenopausal women. The main symptom, if any, is pruritus. It can appear in children but remits after the menarche. The skin thins to a dry, shiny, fragile, finely wrinkled, parchment-like appearance and the external genitalia contract and lose their shape and definition. White patches fuse into a symmetric, "keyhole" pattern, often encompassing the perianus. Telangiectasia and mid-line skin "splits" are common. Histologically the epidermis is thin with flattened rete pegs. The dermis is edematous and hyalinized, with a loss of elastic fibers. There is a chronic inflammatory infiltrate in the lower dermis.
Tips for Getting Pregnant You have been married for years? but have not had children. Maybe it helps you practice the following tips for couples to get pregnant.
Chicken pox symptoms adults Are you looking for chicken pox symptoms adults? Chickenpox or chicken pox is a highly contagious illness caused by primary infection with varicella zoster virus (VZV). It usually starts with vesicular skin rash mainly on the body and head rather than at the periphery and becomes itchy, raw pockmarks, which mostly heal without scarring.
Chickenpox is an airborne disease spread easily through coughing or sneezing of ill individuals or through direct contact with secretions from the rash. A person with chickenpox is infectious one to two days before the rash appears. The contagious period continues for 4 to 5 days after the appearance of the rash, or until all lesions have crusted over. Immunocompromised patients are probably contagious during the entire period new lesions keep appearing. Crusted lesions are not contagious.
Progeria Information and Facts Are you looking for progeria information and facts? here is some information about progeria.
Progeria is an extremely rare genetic condition wherein symptoms resembling aspects of aging are manifested at an early age. The word Progeria comes from the Greek words "pro" means "before" and "géras" means "old age". The disorder has very low incidences and occurs in an estimated 1 per 8 million live births. Those born with progeria typically live to their mid teens and early twenties. It is a genetic condition that occurs as a new mutation (de novo), and is not inherited. Although the term progeria applies strictly speaking to all diseases characterized by premature aging symptoms, and is often used as such, it is often applied specifically in reference to Hutchinson-Gilford Progeria Syndrome.
Exercises for Pregnant Women Exercise does wonders during pregnancy. It boosts mood, improves sleep, and reduces pregnancy aches and pains. It also prepares you for childbirth by strengthening muscles and building endurance, and makes it much easier to get back in shape after your baby's born.