Learning Objectives In this section, you will: Mathematicians, scientists, and economists commonly encounter very large and very small numbers. But it may not be obvious how common such figures are in everyday life. For instance, a pixel is the smallest…
Learning Objectives In this section, you will: It is often said that mathematics is the language of science. If this is true, then an essential part of the language of mathematics is numbers. The earliest use of numbers occurred 100…
Credit: Andreas Kambanls Chapter Outline 1.1 Real Numbers: Algebra Essentials 1.2 Exponents and Scientific Notation 1.3 Radicals and Rational Exponents 1.4 Polynomials 1.5 Factoring Polynomials 1.6 Rational Expressions It’s a cold day in Antarctica. In fact, it’s always a cold day in Antarctica. Earth’s southernmost continent,…
Pus is a thick, whitish-yellow fluid that oozes from a wound because white blood cells, bacteria, and dead skin cells have accumulated there. Eventually the white blood cells eat up all the bacteria and dead skin cells, and the pus clears up on…
As soon as you scrape or break the skin anywhere on your body, special blood cells called platelets get to work. Platelets stick together like glue at the cut site, forming a clot. This clot is like a protective bandage over your cut…
A bruise is a common skin injury that causes discoloration of the skin, usually yellowish, brownish, or purplish spots. Blood from damaged blood vessels deep beneath the skin collects near the skin’s surface, resulting in a “black and blue” mark. You can get a bruise by…
Your skin is your body’s largest organ and acts as a barrier to the outside world. It covers your entire body and has a surface area of around 21.5 square feet (2 square meters). Its thickness ranges from 0.02 inch (0.5 millimeter) on your…
During a person’s life, they will breathe about 75 million gallons (284 million liters) of air. Every minute, the human body needs 2 gallons (7.5 liters) of air when lying down, 4 gallons (15 liters) when sitting, 6 gallons (23 liters) when walking,…
Are the lungs connected to my voice? Yes. The human voice, whether singing, speaking, or yelling, is made by a combination of factors. It all begins with air. Air from your lungs rushes through your trachea (also called the windpipe) and vibrates your vocal cords,…
You usually don’t have to think much about your breathing because your brain controls it automatically. When you have a lot of carbon dioxide—the waste gas produced by body processes—in your blood, your brain gets the message and tells your lungs to exhale and dispose of it.…