How Your Body Works: 1 (Children's World)

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The human body contains approximately 6 quarts (5.6 liters) of blood. Blood acts as your body’s transportation system—in one day, your blood travels nearly 12,000 miles (19,312 kilometers). Pumped along by your heart, blood takes oxygen from the air you breathe and nutrients from the food you eat to all the cells of your body. (Your heart pumps 1 million barrels of blood during your lifetime—enough to fill three supertankers.) Blood also keeps cells clean and healthy by transporting waste products away after the nutrients and oxygen have been used for processes such as growth and repair. In addition, blood transports hormones—chemicals made in glands that control a variety of processes—throughout your body. What if you've already had yours removed? No worries! People seem to be perfectly fine without it. 8. Nearsightedness and farsightedness are caused by defects in the shape of our eyeballs Your lettered blood type is determined by which antibodies are in your plasma and which antigens are present in your red blood cells. (Antibodies are blood proteins, while antigens activate an immune response and control what enters and exits a cell.)

Your Eyes (for Kids) - Nemours KidsHealth Your Eyes (for Kids) - Nemours KidsHealth

If you drink alcohol with an empty stomach, the alcohol passes directly into your bloodstream. If you’ve eaten before drinking, the rate of alcohol absorption slows down but doesn’t stop. Types of drink Sometimes someone's eyeball shape makes it difficult for the cornea, lens, and retina to work perfectly as a team. When this happens, some of what the person sees will be out of focus. The reproductive system—*insert opening riff to Marvin Gaye's Let's get it on—allows us to uhh make babies. And how about the last time you felt sad, scared, or upset? Your eyes got a message from your brain to make you cry, and the lacrimal glands made many, many tears. How Can I Protect My Eyes?Think about that the next time you hit up Tequila Tuesday. 14. Sunburn can permanently damage your skin's blood vessels Yes, I've watched Jurassic Park way too many times.) 4. Our immune system fights off infection mostly through the use of antibodies and microphages All the blood leaving the stomach and intestines passes through the liver, where it is processed, broken down, and balanced so that it can be returned to the body fresh and clean. The liver also stores important nutrients and glucose (for energy), metabolizes drugs, synthesizes proteins, and aids in metabolism and detoxification. In other words, our liver is one busy, busy organ! These next parts are really cool, but you can't see them with just your own eyes! Doctors use special microscopes to look at these inner parts of the eye, such as the lens. After light enters the pupil, it hits the lens. The lens sits behind the iris and is clear and colorless. The endocrine system produces hormones that regulate metabolism, growth and development, tissue function, sexual reproduction, sleep, and mood.

Body systems - 3rd level Science - BBC Bitesize

Okay, so this one is a little unsettling. Did you know that there are ten times more bacteria cells in our bodies than our own human cells? Of course, most of these bacteria are, if not perfectly harmless, fairly essential to our health, helping us to perform key bodily functions. Some people assume that blood is red because of all the iron in it, kind of like why rust is red. But it's a little more complex than that. The red color of blood is created because the iron in your hemoglobin is bound in a ring of atoms called porphyrin. This structure has a shape that makes the blood appear red. When oxygen binds to the porphyrin ring, it changes the shape, making our red blood cells appear an even more vivid shade of red. You can see that the eye's pretty amazing. So, come on — let's take a tour of its many parts. What Are the Parts of the Eye? If you can’t find the information you’re looking for in the Coronavirus (COVID-19) section, then for queries about: The muscular system facilitates movements of our bodies, from reaching for the remote control to smashing out an intense workout in the boxing ring.The innate immune system provides a general defense against harmful germs and substances, so it’s also called the non-specific immune system. It mostly fights using immune cells such as natural killer cells and phagocytes (“eating cells”). The main job of the innate immune system is to fight harmful substances and germs that enter the body, for instance through the skin or digestive system.

15 Human biology basics everyone should know - Brainscape 15 Human biology basics everyone should know - Brainscape

There are two subsystems within the immune system, known as the innate (non-specific) immune system and the adaptive (specific) immune system. Both of these subsystems are closely linked and work together whenever a germ or harmful substance triggers an immune response.So often we feel powerless in our health. But the truth is that while we all have tendencies to certain issues, we also have the power to change our health trajectory.