Tissues of the Body

Cells combine to form tissues, and tissues combine to form organs. There are four primary types of tissues –Epithelial tissue –Connective tissue –Muscle tissue –Nervous tissue

 Found in the outer cover of body and in the inner cavities.  Has Two Types:  Membranous epithelia: form the coverings or linings of organs.  Glandular epithelia: form exocrine and endocrine glands. Epithelial Tissue

Has five functions:  Secretion  Absorption  Excretion  Protection  Sensation Epithelial Tissue

Epithelium-Human Stomach

Glandular Epithelia Epithelial tissues illustrate a basic biological principle: that structure closely correlates with function

Figure 4.4

Binds the cells and organs of the body together –All connective tissues consist of two basic components: cells and extracellular fibers Two types of connective tissue are: –Fibrous Connective tissue. –Specialized Connective tissue Section 4-1 Connective Tissue

An important structural component of organs – Consists of two types: Dense connective tissue Loose connective tissue Connective Tissue

Perform specific functions essential to homeostasis The body contains three types of specialized connective tissue: Cartilage Bone Blood Specialized Connective Tissues

Cartilage – Consists of specialized cells embedded in a matrix of extracellular fibers and other extracellular material Blood –Contains blood cells, platelets, plasma

Osseous Tissue Bone –Consists of bone cells (osteocytes) and a calcified cartilage matrix Two types of bone tissue exist: spongy and compact

Consists of specialized cells that contract when stimulated The body has three types of muscle tissue: Skeletal (voluntary, striated) Cardiac (involuntary, striated) Smooth (involuntary. non-striated) Muscular Tissue

Muscular TissueMuscular Tissue

Nervous Tissue Contains specialized cells that conduct impulses Conducting cells, called neurons, transmit impulses from one region of the body to another. Nonconducting cells, neuroglia, are a type of nervous system connective tissue.

Nervous Tissue

Organ Systems Tissues combine to form organs. – Organs are discrete structures that have evolved to perform specific functions – Most organs do not function alone, they are part of a group of cooperative organs, called an organ system.

Please refer to Sylvia Mader HUMAN BIOLOGY 12 th Edition Dr Awad Widaa

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