Humans shed about 600,000 particles of skin every hour. This is about 1.5 pounds a year. By age 70, the average person will have lost 105 pounds of skin in their lifetime.
The skin is the body's largest organ and is made up of water, proteins, lipids and different minerals and chemicals. Its job is to protect the body from infections and germs. The skin regenerates itself about every 27 days. The stratum corneum is the outer layer of dead skin cells that used to exist in the epidermis. The epidermis is the outer layer of the skin and is also the thinnest layer. It is responsible for protecting the body from the environment.Learn More
An average human exhales around 2.3 pounds of CO2 in a day. That rate increases by up to a factor of eight during heavy physical exertion and falls somewhat during periods of relaxation, such as during sleep.Full Answer >
According to a 1994 study by Zhao Y and Ye D, published in Pub Med, human males can generate approximately 120 kilograms of force. This is equal to about 265 pounds of force. Females generate slightly less powerful, but comparable, forces.Full Answer >
Humans and other living organisms require oxygen to breathe. Oxygen enters the lungs when a person inhales, then diffuses through membranes into the red blood cells. It is then transported by these cells through the blood vessels to reach other cells throughout the body. It is essential to brain function and respiration and is a vital component of the metabolic process.Full Answer >
Humans do not have the tapetum lucidum. The tapetum lucidum is a reflecting structure that many animals have behind the retinas of their eyes. It is present in the eyes of many vertebrates, including dogs, cats, horses and deer, but humans and some other primates do not have it.Full Answer >