#blood flow
aye this scene in dracula untol story is HOT as fuck w/pulsating & blood flow sounds
This is why I don’t believe guys who tell me that the condom is too small.
When I was in middle school, we had a woman come teach us about contraception, and literally the first thing she told us was ‘Ladies, if a guy ever tells you he can’t wear condoms because they’re too small, he’s lying’ and then proceeded to open a condom and stretch it up her forearm up to her elbow.
My health teacher did the same thing, but she put the entire contents of a 2-liter bottle of soda into a condom and said, “So girls, if a boy ever says that he’s too big for condoms, you run. You run so far.”
This is one post we often see and really dislike. The message seems to be that no penis is too big for any condom and that the statement “my penis is too big for this condom” is never a valid one. And this is not true.
As you you can see in the first pictures and read in the quoted posts above, a condom can be stretched out to fit a foot, a forearm and 2 liter of soda.This does not mean that this is safe or comfortable.
Condoms that are too small for you can partly cut off blood circulation and are prone to break. While carefully putting it on a foot or hand doesn’t necessarily tear it (but can - like it did in the second/third pictures), rubbing it against skin (which is what happens during sex) can easily do that.
Condoms are not “one size fits all”. It’s important to find condoms fitting you. Check out this site http://www.condom-sizes.org/condom-size-chart/condom-size-chart and look at “MY.SIZE” condoms http://www.mysize-condoms.com/. They promote finding the right size and offer “try out” packages which include condoms in three different sizes with which you can find your optimal choice (since MY.SIZE condoms are rather expensive, I suggest searching for cheaper brands as soon as you know your size).
There seem to be men that would tell lies about non fitting condoms to get unprotected sex. This is - obviously - a very immature behaviour. Nevertheless, this is a relevant claim.
Please stay safe and spread the word, this is so important!
Post link
Brain Refreshing: Why the Dreaming Phase Matters
Scientists have long wondered why almost all animals sleep, despite the disadvantages to survival of being unconscious. Now, researchers led by a team from the University of Tsukuba have found new evidence of brain refreshing that takes place during a specific phase of sleep: rapid eye movement (REM) sleep, which is when you tend to dream a lot.
Previous studies have measured differences in blood flow in the brain between REM sleep, non-REM sleep, and wakefulness using various methods, with conflicting results. In their latest work, the Tsukuba-led team used a technique to directly visualize the movement of red blood cells in the brain capillaries (where nutrients and waste products are exchanged between brain cells and blood) of mice during awake and asleep states.
“We used a dye to make the brain blood vessels visible under fluorescent light, using a technique known as two-photon microscopy,” says senior author of the study Professor Yu Hayashi. “In this way, we could directly observe the red blood cells in capillaries of the neocortex in non-anesthetized mice.”
The researchers also measured electrical activity in the brain to identify REM sleep, non-REM sleep, and wakefulness, and looked for differences in blood flow between these phases.
“We were surprised by the results,” explains Professor Hayashi. “There was a massive flow of red blood cells through the brain capillaries during REM sleep, but no difference between non-REM sleep and the awake state, showing that REM sleep is a unique state”
The research team then disrupted the mice’s sleep, resulting in “rebound” REM sleep—a stronger form of REM sleep to compensate for the earlier disruption. Blood flow in the brain was further increased during rebound REM sleep, suggesting an association between blood flow and REM sleep strength. However, when the researchers repeated the same experiments in mice without adenosine A2a receptors (the receptors whose blockade makes you feel more awake after drinking coffee), there was less of an increase in blood flow during REM sleep, even during rebound REM sleep.
“These results suggest that adenosine A2a receptors may be responsible for at least some of the changes in blood flow in the brain during REM sleep,” says Professor Hayashi.
Given that reduced blood flow in the brain and decreased REM sleep are correlated with the development of Alzheimer’s disease, which involves the buildup of waste products in the brain, it may be interesting to address whether increased blood flow in the brain capillaries during REM sleep is important for waste removal from the brain. This study lays preliminary groundwork for future investigations into the role of adenosine A2a receptors in this process, which could ultimately lead to the development of new treatments for conditions such as Alzheimer’s disease.
