The Circulatory System, Part 2

Cells, like these nerve cells, do not work in isolation (alone). To send orders from your brain to your legs, for example, signals pass through many nerve cells. These cells work together to perform a similar function.

A group of similar cells that work together is known as a tissue. Cells are grouped together to carry out specific functions. A group of cells that work together form a tissue. Your body has four main types of tissues, as do the bodies of other animals. These tissues make up all structures and contents of your body.

Multiple Choice

Which is the definition for TISSUE?

• A liquid to use for wiping areas

• The smallest unit of life

• A group of cells that work together

Multiple Choice

How are tissues related to cells?

• They are used to describe systems.

• A group of similar cells that work together for a special function is known as a tissues

• group of organs that work together to perform a particular function.

Epithelial tissue is made up of layers of tightly packed cells that line the surfaces of the body. Examples of epithelial tissue include the skin, the lining of the mouth and nose, and the lining of the digestive system.

Fill in the Blanks

Complete the sentence: the skin, mouth and nose lining, and stomach lining are part of the (muscular, excretory, or epithelial) tissue.

Connective tissue is made up of many different types of cells that are all involved in supporting and binding other tissues of the body. Examples include tendon, cartilage, and bone. Blood is also classified as a specialized connective tissue.

Muscle tissue is made up of bands of cells that contract and allow movement.

​Nervous tissue is made up of nerve cells that sense stimuli and transmit signals. Nervous tissue is found in nerves, the spinal cord, and the brain.

Multiple Choice

Which is TRUE about the nervous and muscular systems?

• Muscle tissue is made up of one muscle cell and the nervous tissue sense stimuli.

• Muscle tissue is composed of bands of cells to transmit signals. Nervous tissue contract and allow movement.

• Muscle tissue and nervous tissue are the same things.

• Muscle tissue is made up of bands of cells that contract and allow movement. Nervous tissue sense stimuli and transmit signals.

Groups of Tissues Form Organs

A single tissue alone cannot do all the jobs that are needed to keep you alive and healthy. Two or more tissues working together can do a lot more. An organ is a structure made of two or more tissues that work together. The heart is made up of the four types of tissues.

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One of the most important functions of organ systems is to provide cells with oxygen and nutrients and to remove toxic waste products such as carbon dioxide. A number of organ systems, including the cardiovascular and respiratory systems, all work together to do this.

Fill in the Blanks

TRUE or FALSE? Human bodies need only one system to work properly in order to survive.