Feeds

How long does it take the body to...

The speed of nature

Internet Security Threat Report 2014

Part two Also in this week's column:

Part Two: How long does it take the body to...

  • It takes time for everything, including what happens in the human body.
  • On average, nerve regeneration takes four to six weeks.
  • Gums are renewed every one to two weeks.
  • Eyelashes, which are more plentiful on the upper eyelid than on the lower eyelid, are shed continuously. Each of the more than 200 hairs per eye lasts from three to five months.
  • The vibrations in the air constitute sound waves. The higher the pitch, the greater the frequency or cycles per second. Adults can detect sound waves that have a frequency between about 16 and about 20,000 cycles per second. Yet they hear best at frequencies ranging from about 1,000 to 2,000 cycles per second. Children hear higher-pitched notes better than adults. After puberty, this sensitivity declines at the same time as the voice deepens. Thus, our ears are best adapted to the pitch or sound frequencies of human conversation.
  • The ability of the brain to detect the location of a sound depends on the differences in the time of the arrival of the sound to the two ears. We can detect the source of a sound even if it arrives in one ear a hundredth of a second before it gets to the other.
  • The body loses water through the skin (from simple diffusion) at the rate of half a litre per day. The body loses about the same amount of water each day from the lungs - in breath. A breath lasts about five seconds. Inhaling takes about two seconds, exhaling about three.
  • Nicotine, a component of tobacco smoke, gets into the body very rapidly. With one puff on a cigarette, nicotine reaches the brain in seven seconds. This is several seconds faster than it takes alcohol to get into the brain. Even heroin, when it is injected into the arm below the elbow, takes twice as long as it does for nicotine to reach the brain.
  • Statistically, one's life is shortened 14 minutes for every cigarette smoked.
  • On average, a single cancer cell divides only once every hundred days. At that rate, owing to exponential growth (one cell dividing into two, two into four, four into eight, and so on), one cancer cell may take eight years to form a pea-sized tumor. But two years later, the tumor will be about the size of a cantaloupe melon and weigh more than a pound (half a kilo).
  • Human adult males have four or five erections per night while sleeping. Each lasts about 10 minutes, if uninterrupted
  • .

Stephen Juan, Ph.D. is an anthropologist at the University of Sydney. Email your Odd Body questions to s.juan@edfac.usyd.edu.au

Intelligent flash storage arrays

More from The Register

next story
Renewable energy 'simply WON'T WORK': Top Google engineers
Windmills, solar, tidal - all a 'false hope', say Stanford PhDs
FORGET the CLIMATE: FATTIES are a MUCH BIGGER problem - study
Fat guy? Drink or smoke? You're worse than a TERRORIST
SEX BEAST SEALS may be egging each other on to ATTACK PENGUINS
Boffin: 'I think the behaviour is increasing in frequency'
HUMAN DNA 'will be FOUND ON MOON' – rockin' boffin Brian Cox
Crowdfund plan to stimulate Blighty's space programme
Post-pub nosh neckfiller: The MIGHTY Scotch egg
Off to the boozer? This delicacy might help mitigate the effects
I'M SO SORRY, sobs Rosetta Brit boffin in 'sexist' sexy shirt storm
'He is just being himself' says proud mum of larger-than-life physicist
NASA launches new climate model at SC14
75 days of supercomputing later ...
Britain's HUMAN DNA-strewing Moon mission rakes in £200k
3 days, and Kickstarter moves lander 37% nearer takeoff
prev story

Whitepapers

Why and how to choose the right cloud vendor
The benefits of cloud-based storage in your processes. Eliminate onsite, disk-based backup and archiving in favor of cloud-based data protection.
Forging a new future with identity relationship management
Learn about ForgeRock's next generation IRM platform and how it is designed to empower CEOS's and enterprises to engage with consumers.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
The hidden costs of self-signed SSL certificates
Exploring the true TCO for self-signed SSL certificates, including a side-by-side comparison of a self-signed architecture versus working with a third-party SSL vendor.
Storage capacity and performance optimization at Mizuno USA
Mizuno USA turn to Tegile storage technology to solve both their SAN and backup issues.