Do now Activity #1 Explain the Principle of Complementarity. What is the definition of anatomy? What is the definition of physiology? Are you ready to turn in your Critical Reading article & 1-Pager on 8/29/18?
chapter 4-1: epithelial tissue Essential Question: Explain the Principle of Complementarity as reflected by epithelial tissue. Learning Target Identify the tissues of the human body. Describe the special characteristics of epithelial tissue. Describe how epithelial tissue is named and classified. List the types of epithelial tissues and an example of each, including function. Define gland. Distinguish between exocrine and endocrine glands. chapter 4-1: epithelial tissue
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Tissues: Groups of cells similar in structure and function overview Connective, epithelial, muscle, nervous Tissues: Groups of cells similar in structure and function
overview Histology studies the four tissue types of the human body: Epithelial Connective Muscle Nerve Upper left: connective Lower left: muscle Upper right: epithelial Lower right: nervous
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Found on the surface of the body anatomy Found on the surface of the body
Covers the walls of organs anatomy Covers the walls of organs
Found in the lining of the body cavities anatomy Found in the lining of the body cavities
anatomy Found in the glands
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physiology Forms boundaries
physiology Protection
Absorption: allows stuff in physiology Absorption: allows stuff in
Filtration: regulates what goes in or out physiology Filtration: regulates what goes in or out
Excretion: removes something physiology Excretion: removes something
Secretion: release something useful physiology Secretion: release something useful
Sensory reception: changes shape physiology Sensory reception: changes shape
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Special characteristics 1. Special contacts: it fits close together to form tight, continuous sheets
Special characteristics 2. Polarity: it has two surfaces. Apical (top) is free and basal (bottom) is attached to something
Special characteristics 3. Supported by connective tissue
Special characteristics 4. Avascular but innervated: contains no blood vessels (avascular) but supplied by nerve fibers (innervated)
Special characteristics 5. Regenerative: rapidly replaces lost cells by mitosis
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classification Epithelial tissue is classified by cell shape and by how many layers of cells there are
Simple Epithelia has 1 layer classification Simple Epithelia has 1 layer
Stratified Epithelia has 2 or more layers classification Stratified Epithelia has 2 or more layers
classification There are 3 types of epithelial cell shapes: Squamous: Flattened/scale-like Cuboidal: boxlike Columnar: Tall/rectangular/column shaped
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glands A gland is one or more cells that makes and secretes an aqueous (water based) fluid
glands Glands are classified by: Site of product release: endocrine or exocrine Number of cells forming the gland
glands Endocrine Glands Ductless glands that produce hormones Chemical messengers carried by the blood Secretions include amino acids, proteins, and steroids
glands Exocrine Glands More numerous than endocrine glands Secrete their products onto body surfaces (skin) or into body cavities Must use ducts Examples include mucous, sweat, oil, and salivary glands
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