what percentage of the human body is water quizlet

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How Much of Your Body Is Water?

Have you ever wondered how much of your body is water? The percentage of water varies according to your age and gender. Here’s a look at how much water is inside you.

The amount of water in the human body ranges from 45-75%.1 The average adult human body is 50-65% water, averaging around 57-60%. The percentage of water in infants is much higher, typically around 75-78% water, dropping to 65% by one year of age.2

Body composition varies according to gender and fitness level because fatty tissue contains less water than lean tissue. The average adult male is about 60% water. The average adult woman is about 55% water because women naturally have more fatty tissue than men.3 Overweight men and women have less water, as a percent than their leaner counterparts.

Who Has the Most Water?

Babies and children have the highest percentage of water.
Adult men contain the next highest level of water.
Adult women contain a lower percentage of water than babies or men.
Obese men and women have less water, as a percentage than lean adults.

The percent of water depends on your hydration level.2 People feel thirsty when they have already lost around 2-3% of their body’s water. Being dehydrated by just 2% impairs performance in mental tasks and physical coordination.4

Although liquid water is the most abundant molecule in the body, additional water is found in hydrated compounds. About 30-40% of the weight of the human body is the skeleton, but when the bound water is removed, either by chemical desiccation or heat, half the weight is lost.5

Watch Now: Why is Water So Crucial to Body Function?

Where Exactly Is Water in the Human Body?

Most of the body’s water is in the intracellular fluid (2/3 of the body’s water). The other third is in the extracellular fluid (1/3 of the water).6

The amount of water varies, depending on the organ. Much of the water is in blood plasma (20% of the body’s total).6 According to a study published in 1945 and still widely cited, the amount of water in the human heart and brain is 73%, the lungs are 83%, muscles and kidneys are 79%, the skin is 64%, and the bones are around 31%.7

What Is the Function of Water in the Body?

Water serves multiple purposes:

Water is the primary building block of cells.
It acts as an insulator, regulating internal body temperature. This is partly because water has a high specific heat, plus the body uses perspiration and respiration to regulate temperature.
Water is needed to metabolize proteins and carbohydrates used as food. It is the primary component of saliva, used to digest carbohydrates and aid in swallowing food.
The compound lubricates joints.
Water insulates the brain, spinal cord, organs, and fetus. It acts as a shock absorber.
Water is used to flush waste and toxins from the body via urine.
Water is the principal solvent in the body. It dissolves minerals, soluble vitamins, and certain nutrients.
Water carries oxygen and nutrients to cells.

How Much of Your Body Is Water? That All Depends

There are some things you learn in school that never leave you.True? At least, it was true at one point. Depending on a number of factors, your body could be a lot drier than that.

It’s All Downhill From Here

When you were born, you contained the most water, percentage-wise, that you ever will. Human babies are about 78 percent water by weight. But within a year, your water content had already dipped below that classic 70 percent factoid your teachers taught you, weighing in at about 65 percent. You maintain that level of moisture throughout your childhood.

Around puberty, when noticeable sex differences take the stage, the water levels in boys and girls start to differ. That’s thanks to two things: muscle contains more water than fat, and women have more body fat than men. As a result, teenage boys’ bodies are about 60 percent water, while teenage girls’ bodies are drier at about 55 percent. By adulthood, the differences are even more pronounced: Adult men are around 60 percent water while adult women average around 50 percent. After 50, your body is sapped even more, with men at around 55 percent water and women at 47 percent.

My, What Wet Kidneys You Have

Of course, those are just averages. There are other elements at play when it comes to how much water your body contains. Since muscle contains more water than fat, the fittest people contain the most water of people their age, while those with the most fat contain the least.

Your organs have different moisture levels, too. Your lungs, brain, heart, liver, and kidneys are the wettest, between 65 and 85 percent water. Surprisingly, your blood doesn’t even make the top five: plasma, the liquid portion of blood, may be 92 percent water, but it only makes up 55 percent of your overall blood volume. Bones are among the driest parts of the body’s puzzle but still contain a respectable 31 percent water.

long list of duties

All that water has a long list of duties, from insulating your organs and lubricating your joints to forming the very building blocks of cells. And of course, the water that escapes you in sweat and urine helps to cool you off and rid your body of waste (although sweat isn’t as detoxifying as you might think). Whether you’re 70 percent water or 50 percent, chances are you’ve got all the water you need to keep things running smoothly.

The Flu: How It Spreads, and How You Can Stop It

Every year like clockwork, we are confronted with the dreaded flu season. Scientists work tirelessly to understand Influenza and how we can prevent the spread.

Flu Season is upon us. Influenza activity is high across the country and is expected to stay that way for weeks. The Center for Disease Control (CDC) keeps detailed records about the spread of the virus on their page dedicated to the seasonal flu. It seems that this epidemic gets worse every year and the question always is,

what can we do to keep ourselves safe from this virus?

Step one of prevention is understanding what we’re fighting against. In 2018, a study was published about the flu virus and how long it was able to survive once is it spread outside of the human body through touching, coughing, and sneezing. It was found that it truly depends on the environment and the mode of transmission, but that there is opportunity for the virus to survive outside of minutes, and even past an hour once it leaves the body.

Wash Your Hands!
- Sing the “Happy Birthday” song to yourself or count to 20 slowly while you are washing your hands with soap and running water. If you can’t get your hands on soap, hand sanitizer can be an acceptable substitute, but make sure it is alcohol based.
Cover Your Mouth!
- If you feel a cough or a sneeze or cough coming on, protect those around you by aiming into your shirt or a tissue. Avoid using your hands as a shield, especially if you are not able to wash them immediately without touching other surfaces.
what percentage of the human body is water quizlet

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water

Water (chemical formula H₂O) is an inorganic, transparent, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth’s hydrosphere and the fluids of all known living organisms (in which it acts as a solvent^[1]). It is vital for all known forms of life, even though it provides no calories or organic nutrients. Its chemical formula H₂O, indicates that each of its molecules contains one oxygen and two hydrogen atoms, connected by covalent bonds. The hydrogen atoms are attached to the oxygen atom at an angle of 104.45°.^[2] “Water” is the name of the liquid state of H₂O at standard conditions for temperature and pressure.

resource: wikipedia

what percentage of the human body is water quizlet

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what percentage of the human body is water quizlet

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