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What Are Tissues? - Types & Explanation

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  • 0:00 Examination of Tissues
  • 0:36 Human Tissue Types
  • 1:10 Epithelial & Connective Tissue
  • 3:05 Muscle & Nervous Tissue
  • 4:26 Plant Tissue Systems
  • 5:00 Lesson Summary
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Lesson Transcript
Instructor: Laura Enzor

Laura has a Master's degree in Biology and is working on her PhD in Biology. She specializes in teaching Human Physiology at USC.

Learn about the different tissues that are found in humans and plants. This lesson summarizes the four tissue types in humans and the three tissue systems of plants.

Examination of Tissues

A tissue is one of the building blocks of an organism--either animal or plant. An organism is comprised of tissues, which are made up of individual cells. These cells share a similar structure (how they're built) and function (what they do). The study of tissues is a field known as histology.

You may be asking why tissues are important. . . it's simple! Tissues are what makes up our bodies; everything from our bones to organs like our heart and brain! Even blood is considered to be a tissue!

The Four Basic Human Tissue Types

In humans, there are four basic tissue types, which are: epithelial tissue, connective tissue, muscle tissue and nervous tissue.

Within each general tissue type, there are specific tissue types. Think of this like a football team. There are individual players, each with their own 'job' on the field. These are the specific tissue types. The football players are then categorized into either an offense or a defensive team. These teams would be the basic tissue types. The offense and defensive teams are combined into one football team, or an organism.

Epithelial and Connective Tissue

The easiest way to describe an epithelial tissue is to say that it covers something; typically an organ. The skin of our bodies is just one, big piece of epithelial tissue!

All epithelial tissues share one thing in common: a basement membrane. A membrane is a very thin layer of tissue. It's so thin that you can typically see through it! So, how is a basement membrane different from a 'regular' membrane? Where in your house do you find the basement? The very bottom level of your house, right? A basement membrane is exactly that: the very bottom layer of a tissue.

Different types of epithelial tissues are defined by two things:

  1. The cell shape they have
  2. How many cell layers thick they are

Epithelial tissues have one of three main cell shapes: columnar, cuboidal, and squamous. Columnar cells look like columns, and cuboidal cells look like cubes. Squamous cells are scale-like.

The number of cell layers each epithelial tissue has falls into one of two categories: simple, which means 1-cell layer thick, or stratified, which means more than 1-cell layer thick.

Specific epithelial tissue types consist of the combination of the cell shape and number of cell layers. For example, simple cuboidal epithelial tissue describes tissue that is one cell layer thick, with cells that are cube-like in appearance. This tissue, in part, is what makes up our kidneys!

Tissue found in the kidney
Simple Cuboidal ET

Connective tissue does just that--it connects things in our body together! This tissue has many different specific types, which range from bone and cartilage, which make up the human skeleton, to blood and fat (also known as adipose connective tissue).

Bone Connective Tissue
Bone connective tissue

Muscle and Nervous Tissue

There are three different types of muscle tissue. They are smooth, skeletal and cardiac muscle tissue.

Smooth muscle and cardiac muscle are under involuntary control. This means, we can't tell these muscles to work. This comes in handy considering where these tissues are found - smooth muscle makes up the organs of our digestive tract, our stomach and intestines, and cardiac muscle is found in our heart. Can you imagine having to 'tell' your stomach to digest your food or your heart to beat?

Skeletal muscle, on the other hand, is under voluntary control, which means we need to tell our muscles to work.

Muscle Tissue
Muscle Tissue

Nervous tissue is just one tissue; there are no specific tissues within this broad category. This tissue makes up our brain and spinal chord, as well as the nerves in our bodies.

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