Organs and Systems

Organs are composed of two or more primary tissues that serve the different functions of the organ.The skin is an organ that has numerous functions provided by its constituent tissues.

An organ is a structure composed of at least two, and usually all four, primary tissues. The largest organ in the body, in terms of surface area, is the skin (fig. 1.21). In this section, the numerous functions of the skin serve to illustrate how primary tissues cooperate in the service of organ physiology.

■ Figure 1.20 A cross section of a tooth showing pulp, dentin, and enamel. The root of the tooth is covered by cementum, a calcified connective tissue that helps to anchor the tooth in its bony socket.

Epidermis-epithelial tissue)

Stratum corneum Stratum granulosum Stratum spinosum Stratum basale

Dermis (Connective tissue)

Hypodermls_

Epidermis-epithelial tissue)

Dermis (Connective tissue)

Hypodermls_

Epithelial Tissue Hair

Stratum corneum Stratum granulosum Stratum spinosum Stratum basale

Arrector pili muscle (Muscle tissue)

Sweat gland

Adipose tissue

Arteriole

Hair bulb

Venule

Motor nerve (Nerve tissue) ^^ nerve

Arrector pili muscle (Muscle tissue)

Sweat gland

Adipose tissue

Arteriole

Hair bulb

Venule

Motor nerve (Nerve tissue) ^^ nerve

■ Figure 1.21 A diagram of the skin. The skin is an organ that contains all four types of primary tissues.

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Responses

  • elaine
    Are arrector pilus made of epithelial tissue?
    7 years ago
  • Stella
    Where are the epithelial tissue found on human?
    7 years ago
  • clara
    Is a tooth a tissue, a tissue or an organ?
    7 years ago
  • Ines
    Where Is The epithelial Connective Tissue?
    6 years ago
  • annett herrmann
    What organs has the 4 primary tissues?
    6 years ago

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