Circadian rhythm is 24 hour cycle
Q. Which of the following is example of natural Circadian rhythm?- Published on 31 May 16a. Heart Beats
b. Breathing cycles
c. Sleep/wake cycle
d. Both a and b
ANSWER: Sleep/wake cycle
- A circadian rhythm is any biological process that displays an endogenous, entrainable oscillation of about 24 hours. These 24-hour rhythms are driven by a circadian clock, and they have been widely observed in plants, animals, fungi, and cyanobacteria.
- Most living organisms, including humans, have a biological clock that resets every 24 hours, regulating functions such as sleep/wake cycles and metabolism.
- Our biological clock is basically run by four “master regulator” proteins that work in tandem. CLOCK and BMAL1, when combined, promote the production of the proteins PER and CRY. These proteins, in turn, block CLOCK and BMAL1, thus closing the cycle.
- This cycle of activation, production and stop/block goes around once a day and is also influenced by a compound called FBXL3, which flags CRY for degradation by cellular enzymes.
