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Biological clocks The variations of the timing and duration of biological activity in living organisms occur for many essential biological processes. These occur (a) in animals (eating, sleeping, mating, hibernating, migration, cellular regeneration, etc.), and (b) in plants (leaf movements, photosynthetic reactions, etc.). The most important rhythm in chronobiology is the circadian rhythm, a roughly 24 hour cycle shown by physiological processes in plants and animals. (The term circadian comes from the Latin circa, meaning "around" and dies, "day", meaning "approximately a day."). Many other important cycles are also studied, including:* Infradian rhythms, which are long-term cycles, such as the annual migration or reproduction cycles found in certain animals or the human menstrual cycle.* Ultradian rhythms, which are short cycles, such as the 90-minute REM cycle, the 4-hour nasal cycle, or the 3-hour cycle of growth hormone production. They have periods of less than 24 hours.* Tidal rhythms, commonly observed in marine life, which follow the (roughly) 12-hour transition from high to low tide and back. Uploaded by tirtha9 (436) • 4 months ago Tags: biological, clocks tirtha9 (436)

do you have clock in your bathroom or toilette?

last december 27 a friend of mine invited me for lunch.when i used the toilette i saw a clock hanging on the wall and i was smile because i have been many friends house and its my first time i saw a...

Do you use a Watch or Mobile to see time?

I use my mobile to see time.. Infact I dont wear a watch often.. For some reasons I wear it only occasionally.. but my mobile is always with me round the clock so I am habitual watching the time on...

How many clocks did you have to change today.

Since daylight savings time ended this morning and you had to turn back the clocks an hour....how many of you had to change clocks and how many clocks did you have to change? I changed five including...

So who forgot? And when did you realize?

That is it was daylight savings time? And you needed to turn back your clocks? We remembered as soon as we woke up. But it took us about an hour to get to our clocks.Our house had 4 clocks to change....

Day light savings time.

Did you know tonight that your supposed to set your clock back an hour tonight at 2am. I didn't tell tonight. But, I'm glad because I get to get an extra hour of sleep. Sleep is good exspecialy since...

Fabulous clocks by Eric Freitas

Art Attack Thursday!You all know how nuts I am about clocks! I certainly talk about them often enough, do tons of projects using clock or time imagery, and I love love love to show you fabulous...

Keep Time with a Grandfather Clock

Most people know that grandfather clocks have been a round for a long time, and that it makes a great statement in your home. There are tons of different types of clocks, but in my opinion...

Grandfather Clocks are Great Home Additions

In my opinion grandfather clocks are a great addition to any home. They come in so many different styles that it is not hard to find one that fits within your home’s theme. One place that...

The pinball clock from Sesame Street

I didn’t grow up with Sesame Street, but my children did, and of course I watched it with them. There are many iconic items that I loved, and the pinball number clock was one of them! You might...

Grandfather Clocks at 1-800-4Clocks.com

Grandfather clocks used to be very popular, but as styles changed so did peoples’ interest in owning one. Well, they are now coming out with more modern, and still some traditional, style...