Most organs of the human body contain all four (4) tissue types working together to allow the organ to perform its specific function. (1) indicate where those four tissue types may be found and name them. (4 marks) (2) Briefly describe the functions of the four tissue types. In your answer you must include a unique structural feature of each tissue type that allows it to perform this function.

(1) The four primary tissue types in the human body are epithelial tissue, connective tissue, muscle tissue, and nervous tissue.

• Epithelial tissue: This tissue type can be found lining the outer surfaces of organs and blood vessels throughout the body, as well as the inner surfaces of cavities in many internal organs.

• Connective tissue: This is found in between other tissues everywhere in the body, including the nervous system. It is most abundant in the dermis of the skin, the fibrous tissues of the joints, and in the bone and cartilage.

• Muscle tissue: This tissue type is found throughout the body and is responsible for most methods of movement. It can be found in the muscles, including the heart.

• Nervous tissue: This is found in the brain, spinal cord, and nerves.

(2) The functions of the four tissue types are as follows:

• Epithelial tissue: This tissue type provides protection, controls permeability, provides sensation, and produces specialized secretions. Its unique structural feature is its polarity, with an apical surface and a basal surface, which allows it to perform these functions.

• Connective tissue: This tissue type supports, protects, and binds other tissues together. Its unique structural feature is its extracellular matrix, which consists of a variety of protein fibers and a ground substance, allowing it to provide structure and support.

• Muscle tissue: This tissue type is responsible for producing force and motion. Its unique structural feature is its ability to contract and relax, which allows it to move the body or parts of it.

• Nervous tissue: This tissue type is responsible for transmitting and receiving internal and external stimuli. Its unique structural feature is its specialized cells called neurons, which have the ability to transmit electrical signals, allowing it to perform this function.