Many eukaryotes have long slender motile cytoplasmic projections, called flagella , or similar structures called cilia . Flagella and cilia are sometimes referred to as undulipodia ,  and are variously involved in movement, feeding, and sensation. They are composed mainly of tubulin . These are entirely distinct from prokaryotic flagellae. They are supported by a bundle of microtubules arising from a centriole , characteristically arranged as nine doublets surrounding two singlets. Flagella also may have hairs, or mastigonemes , and scales connecting membranes and internal rods. Their interior is continuous with the cell's cytoplasm .
Uhuu, another great article!
Since I came across your website few weeks ago, I’m trying to read the articles on a regular bases. And this one comes just in time (yeah, a sign from the Universe!) to support my decision in keeping up with the fasting I’ve already started. My way – twice a week for 24 hours. (I actually adopted this from Brad Pilon’s book Eat Stop Eat; also a nice piece of information on the subject). It’s been just few weeks now that I’ve been doing it but it feels awesome. And about the training while fasting – last time I decided to have my Karate class on a fasting day – was great! Absolutely no lack of energy, would say even the opposite. ;)
Well, my commitment is a year-long, so I hope that sometime in the middle of the year I’ll already have a Success Story to send you, along with the meditation practice. :)) Cheers!
Although gonadotropins are secreted in a pulsatile manner (as a result of pulsatile GnRH release), unlike the case of GnRH and GnRH agonists , constant/non-pulsatile activation of the gonadotropin receptors by the gonadotropins does not produce functional inhibition. This can be seen during the first 7–10 weeks of pregnancy, where constantly high and progressively-increasing levels of hCG circulate and mediate production of estrogen and progesterone by the corpus luteum until the placenta takes over the production of these hormones.