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Body Tissues
© 2014 Project Lead The Way, Inc.Human Body Systems
Tissue Basics• Tissues are groups of cells that are
similar in structure that work together to perform a specific function.
• There are four main tissue types:– Epithelium– Connective tissue– Muscle – Nervous tissue
Epithelium• Epithelium, or epithelial tissue, forms the
linings, coverings, and glandular tissue of the body. – One type of epithelium forms the outer layer
of the skin– Another type of epithelium lines the air sacs of
the lungs
• Cells in epithelium are packed tightly together to form continuous sheets
Connective Tissue• Connective tissue protects, supports, and binds
together other body tissues. • Connective tissue is made up of different types
of cells in varying amounts of a nonliving substance around the cells, called the matrix.
• Examples of connective tissue include:– Bone– Cartilage– Adipose tissue (fat)– Blood
Muscle Tissue• Muscle tissue is specialized to contract
and cause movement.
• There are three main types of muscle tissue:– Skeletal muscle– Cardiac muscle– Smooth muscle
• Can you guess the location and function of each muscle type?
Nervous Tissue• Nervous tissue is composed of specialized cells
called neurons that receive and send electrical signals in the body.
• Nervous tissue responds to stimuli and transmits impulses and together with supporting cells, makes up the brain, spinal cord, and nerves.