00:00How many different liquids do you think are in your body?
00:045? Blood, saliva, sweat, maybe a few others?
00:08Well, the real number is over 50.
00:11And each of these liquids has a specific role that keeps you alive and functioning.
00:16Take digestion. It's not just stomach acid.
00:20The whole process starts in your mouth with fluids from the salivary glands.
00:24Then your stomach adds its own acid.
00:27The pancreas releases digestive juices.
00:29The liver sends bile.
00:31The intestines produce their own secretions.
00:34These are all separate fluids working together step by step to break down food and absorb nutrients.
00:40Now that's teamwork.
00:43Then there are the fluids that protect your brain and nerves.
00:47Cerebrospinal fluid surrounds and cushions the brain and spinal cord.
00:51It acts like a shock absorber.
00:53In your inner ear, two different liquids help you hear and keep your balance.
00:57In your eyes, there's aqueous humor.
01:00This fluid constantly circulates inside your eyeball, keeping necessary pressure and feeding the lens.
01:06It completely refreshes itself about every 100 minutes.
01:09There's also something called the vitreous body.
01:12It fills the space behind the lens, helping the eye keep its shape.
01:17Your body also heavily relies on protective lubricants.
01:21For example, synovial fluid, the slippery egg white-like lubricant, sits inside your joints, letting bones move smoothly against each
01:29other.
01:29Something called pleural fluid surrounds your lungs, so they can expand and contract without friction.
01:35Another fluid, called pericardial fluid, cushions the heart.
01:39And peritoneal fluid allows organs in the abdomen to slide against one another instead of rubbing.
01:46Then there's the prostate fluid, which is part of the reproductive system.
01:50Amniotic fluid surrounds and protects a developing baby.
01:53Mucus from various membranes trap dust, bacteria, and other particles to keep tissues safe.
02:01Now, it's time to talk about some of these fluids in more detail.
02:05And we'll start with something not very appetizing, but very important.
02:09Bile.
02:09It's a brown-green fluid made by the liver and stored in the gallbladder.
02:14When you eat, especially fatty food, it gets released into your small intestine.
02:18Its main ingredient is bile salts that act like soap.
02:23Fat doesn't mix with water, so bile salts break large fat droplets into tiny ones.
02:28This way, it's easier for your body to absorb them.
02:31They also help you absorb fat-soluble vitamins like A, D, and E.
02:36Bile salts also keep cholesterol in the gallbladder from clumping together and forming gallstones.
02:42About half an ounce of bile salts is released into your intestine every day.
02:46But your body only contains about a teaspoon in total.
02:50All because bile salts are recycled.
02:52After helping with digestion, they're reabsorbed in the small intestine,
02:56sent back to the liver through the bloodstream, and used again.
03:00Blood is probably the most important fluid in your body.
03:03The average adult has about 1.5 gallons of blood.
03:08It delivers oxygen to every cell and carries carbon dioxide away.
03:12It moves glucose for energy, hormones for communication, and white blood cells to fight infections.
03:19Blood also contains platelets and clotting factors.
03:21When you cut yourself, they rush in to seal the damaged blood vessel and stop the bleeding.
03:27Your body contains about 25 to 30 trillion red blood cells.
03:32That's more than two-thirds of all your cells.
03:35Each red blood cell lives about 120 days.
03:38That means your body has to constantly replace them, producing about 2 million new red blood cells every second.
03:45Since we're talking about blood, we should also mention menstrual fluid.
03:50The average woman has a menstrual cycle about every 28 days for roughly 42 years.
03:56That adds up to around 400 to 450 periods in a lifetime.
04:01And the average amount of menstrual fluid per cycle is about 2.5 tablespoons.
04:06Despite what many people think, it's not just blood.
04:09About half of it is blood, and the rest includes tissues from the lining of the uterus, mucus, and vaginal
04:15secretions.
04:18Let's move on to mucus.
04:20However unpleasant it may seem, it's essential for survival.
04:24Mucus is a slippery, clear fluid made by mucus glands.
04:27It lines the airways in your lungs, your stomach, and intestines, your urinary and reproductive tracts, and even your eyes
04:34and ears.
04:35It contains protective substances that get rid of microbes, antibodies that fight infection, and mucins, proteins that give it its
04:43thick, gel-like texture.
04:45The average adult produces about half a gallon of mucus every day.
04:49In the lungs, mucus keeps the airways moist and traps dust, bacteria, and viruses from the air you breathe.
04:57Tiny hair-like structures called cilia move the mucus upward toward the throat.
05:01There, you either swallow it or cough it out.
05:05Pus doesn't sound pleasant either, but it's actually proof that your immune system is doing its job.
05:10It's a thick, white, yellow, or brown fluid that builds up where there's an infection.
05:15It's made of bacteria, white blood cells, proteins, and dead cell debris.
05:20When pus collects under the skin, you see it as a pimple.
05:23When it forms deeper in the body, it's called an abscess.
05:26Both are your body's way of trapping an infection and keeping it from spreading.
05:32Next, semen is definitely worth mentioning.
05:35It's the fluid released during ejaculation.
05:38It usually contains sperm cells, the male reproductive cells that can fertilize a female egg.
05:43Semen does more than just carry sperm.
05:46It provides fluid for them to move in and contain fructose, a sugar that gives them energy.
05:51Interestingly, unlike females who are born with all the eggs they will ever have,
05:56males produce sperm continuously starting from puberty.
06:01Moving up the body all the way to your mouth, saliva is secreted by salivary glands all around your cheeks
06:07and under your tongue.
06:08The average adult makes about 34 ounces a day.
06:13It's not just spit.
06:15Saliva has antibacterial enzymes, antibodies, and a bit of mucus to keep your mouth healthy.
06:20It makes chewing and swallowing easier.
06:23Plus, it actually helps you taste things.
06:26Taste chemicals need saliva to reach your taste buds.
06:30Some special saliva enzymes even start breaking down starches in your food.
06:35Sure, most of that process ends in your stomach, but it's still handy for cleaning bits stuck between your teeth.
06:41Helps to prevent cavities, you know.
06:43Now, sweat.
06:45It's mostly water, with a pinch of minerals that give it that salty flavor.
06:49Your body has about 3 million sweat glands, and we can divide them into two groups.
06:55Ekrin glands are all over your body, especially on your palms and soles.
07:00Apple cream glands hang out in your armpits.
07:03Sweat's main job is to keep you cool.
07:05When your body heats up, sweat evaporates from your skin and takes the heat with it.
07:10Sweating can also be triggered by emotions.
07:13When you're nervous, scared, or excited.
07:16And when you're upset or emotional, tears show up.
07:18They come from your lacrimal glands, up above and to the side of your eyes.
07:24Every time you blink, they spread over your eyeball, keeping it smooth and clear.
07:28They also drain into your nose.
07:30That's why your nose runs when you cry.
07:33Tears do three big jobs.
07:35They keep your eyes lubricated, wash away irritants, like that stinky chemical from onions, and help you express emotion.
07:44Another important liquid in your body is urine.
07:47The average adult makes about 50 ounces of urine a day.
07:51That's around 6 cups.
07:53Your kidneys produce it, and your bladder stores it.
07:56Urine is full of stuff your body needs to get rid of.
07:59Extra water, salts, and toxic byproducts from breaking down proteins.
08:04Doctors use urine to check your health.
08:06Sugar in urine mean diabetes.
08:09If there are bacteria, it may be a urinary tract infection.
08:13By the way, here's a weird fact for you.
08:15After about 20 weeks of pregnancy, most of the fluid that cushions a baby in the womb is actually made
08:21up of urine from the fetus.
08:22The last liquid we'll talk about today is vomit.
08:27Luckily, it's one of the few body fluids you don't deal with every day.
08:31Thank goodness.
08:32When you vomit, your body often gets rid of toxins.
08:36Vomit is super acidic because of all the stomach acid in it.
08:40That's why it can burn your throat.
08:42Now, all this is just scratching the surface.
08:44For every fluid you see all the time, like saliva, blood, sweat, or tears, there are tons of others you
08:51hardly ever notice.
08:53All these fluids have jobs.
08:55Some keep you alive.
08:56Some keep you moving.
08:58Some fight infection.
08:59And some just make your body work without you even thinking about it.
09:07That's it for today.
09:08So hey, if you pacified your curiosity, then give the video a like and share it with your friends.
09:13Or if you want more, just click on these videos and stay on the Bright Side!
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