Feeds

How long does it take the body to...

The speed of nature

Secure remote control for conventional and virtual desktops

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

Internet Security Threat Report 2014

More from The Register

next story
MEN: For pity's sake SLEEP with LOTS of WOMEN - and avoid Prostate Cancer
And, um, don't sleep with other men. If that's what worries you
Voyager 1 now EIGHTEEN LIGHT HOURS from home
Almost 20 BEEELION kilometres from Sol
HUGE SHARK as big as a WWII SUBMARINE died out, allowing whales to exist
Who'd win a fight: Megalodon or a German battleship?
Jim Beam me up, Scotty! WHISKY from SPAAACE returns to Earth
They're insured for $1m, before you thirsty folks make plans
ROGUE SAIL BOAT blocks SPACE STATION PODULE blastoff
Er, we think our ISS launch beats your fishing expedition
Comet Siding Spring revealed as flying molehill
Hiding from this space pimple isn't going to do humanity's reputation any good
BAE points electromagnetic projectile at US Army
Railguns for 'Future fighting vehicle'
OK Google, do I have CANCER?
Company talks up pill that would spot developing tumors
prev story

Whitepapers

Why cloud backup?
Combining the latest advancements in disk-based backup with secure, integrated, cloud technologies offer organizations fast and assured recovery of their critical enterprise data.
A strategic approach to identity relationship management
ForgeRock commissioned Forrester to evaluate companies’ IAM practices and requirements when it comes to customer-facing scenarios versus employee-facing ones.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Top 5 reasons to deploy VMware with Tegile
Data demand and the rise of virtualization is challenging IT teams to deliver storage performance, scalability and capacity that can keep up, while maximizing efficiency.
Mitigating web security risk with SSL certificates
Web-based systems are essential tools for running business processes and delivering services to customers.