about how many blood cells regenerate each second
The cells lining the stomach, as mentioned, last only five days. The red blood cells, bruised and battered after traveling nearly 1,000 miles through the maze of the body's circulatory system, last only 120 days or so on average before being dispatched to their graveyard in the spleen. The epidermis, or surface layer of the skin, is recycled every two weeks or so. Bones: Cells in the skeletal system regenerate almost constantly, but the complete process takes a full 10 years. The renewal process slows down as we age, so our bones get thinner. Despite all this regeneration all the time, people who want to live forever shouldn't give up on that search for the fountain of youth. SKIN AGE: 2-4 WEEKS. The epidermis or surface layer of the skin is renewed every two to four weeks. This rapid turnover occurs because skin is the body's outer protection and is exposed to injury as well as pollution. Despite this constant renewal, we still get wrinkles as we get older. Whatever your age, your body is many years younger. In fact, even if you're middle aged, most of you may be just 10 years old or less. This heartening truth, which arises from the fact that most of the body's tissues are under constant renewal, has been underlined by a novel method of estimating the age of human cells. Skin: The epidermis sees a fair amount of wear and tear, thanks to its role as the body's outermost layer of protection. These skin cells rejuvenate every two to four weeks. Hair: The body's natural fuzz has a life span of about six years for women and three years for men. Liver: The liver is the human body's detoxifier, purifying a wide variety of contaminants from our systems. It's aided in the process by a constant blood supply and remains largely immune to damage from these toxins by renewing itself with new cells every 150 to 500 days. Stomach and Intestines: Cells that line the surface of the stomach and intestines have a difficult, short life. Red blood cells are thus much more common than the other blood particles: there are about 4,000–11,000 white blood cells and about 150,000–400,000 platelets in each microliter of human blood. Human red blood cells take on average 20 seconds to complete one cycle of circulation. In humans, mature red blood cells are flexible and oval biconcave disks. They lack a cell nucleus and most organelles, in order to accommodate maximum space for hemoglobin. Approximately 2.4 million new erythrocytes are produced per second in human adults. The cells develop in the bone marrow and circulate for about 100–120 days in the body before their components are recycled by macrophages. Each circulation takes about 20 seconds. Approximately a quarter of the cells in the human body are red blood cells. Since they can be also lost through injury and menstruation, the body constantly makes more. HAIR AGE: 3-6 YEARS. The age of your hair depends on how long it is, but it generally grows 1cm each month, explains hair restoration surgeon Dr Bessam Farjo. Each individual hair lasts up to six years in women and three years in men. The epithelial cells that line the surface of the gut have a rough life and are known by other methods to last only five days. Ignoring these surface cells, the average age of those in the main body of the gut is 15.9 years, Dr. Frisen found. The alveoli or air sac cells-needed for the exchange of oxygen and gases-deep in the lungs have a steady progress of regeneration that takes about a year. Meanwhile, the cells on the lung's surface have to renew every two or three weeks.
Approximately 2.4 million.