Cells are like living bricks. They come in all different shapes and sizes, and they have different functions. But when cells work together, they can form tissues. There are four main types of tissues: epithelial, connective, muscle, and nervous. Each type of tissue has different characteristics that make it suited for its specific function. Epithelial […]
Cells are the basic unit of all living things, from single cells that compose the simplest organisms to trillions of cells in the human body’s intricate structures. Every living entity on Earth is composed of cells. We call this the cell theory. According to the cell theory, cells are the fundamental building blocks of living […]
DNA or deoxyribonucleic acid is a nucleic acid found in all living things. Nucleic acids are made of two strands that form a helix, held together by hydrogen bonds between base pairs. The four types in order from least to most important are: cytosine, guanine, adenine, thymine. These nucleobases are arranged into pairs with deoxyribose […]
Some of the Earth’s water supply is temporarily locked up within the many lifeforms found across the Earth’s biosphere. This water makes up a majority of most organisms, and is a critical component, making the processes of life possible. Some organisms are made up of 95% water, while almost all the rest are more than […]
A World of Senses As you read about the human body on our website, hopefully you are learning. But how does the information get from our website into your brain? If you rest your head on the computer screen, will the information seep into you as you sleep? Or does it take a little more […]
As you read this article, hold your hand out in front of you. Now, wave hello at yourself. Okay, now tap yourself on the head. All right, now lets try this same experiment again, only this time we will do it a little differently. Put your arm down. Now look at your other arm. Say […]
The endocrine system is used for communication, throughout your body. The main communication system within your body is the nervous system. The nervous system works in a similar manner as a telephone. Messages are sent from one place to another place, much in the same way that a telephone carries a message from you to […]
Our cells create waste As your body performs the many functions that it needs in order to keep itself alive, it sometimes produces wastes. These wastes are chemicals that are toxic, and that if left alone would seriously hurt or even kill you. For example, as your cells break down amino acids, they produce a […]
The job of your respiratory system is very simple: To bring oxygen into your body, and remove the carbon dioxide from your body. Your body needs oxygen to survive. Oxygen is used by your cells as it performs the functions of life. As your body uses oxygen, your cells produce another gas known as carbon […]
Do you, or someone you know live in a large city? A city is a community of people who work together to support each other, and make life possible. Each person has a different job. Some are builders, others work in markets, while others clean up. Every job is important. Suppose you work in an […]
