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Learn about the structure and functions of epithelial and connective tissues, their classifications, and their role in bodily functions. Explore the differences between exocrine and endocrine glands with examples.
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Learning Outcomes I can name the four main groups of tissuesand give the location and general characteristics of each. I can describe the difference between exocrine and endocrine glands and give examples of each. Epithelial Tissue
Tissue Origins • Histology is the study of tissues. • Four main groups of tissues • Epithelial • Connective • Muscle • Nervous tissue
Epithelial Tissue Overview • Forms a protective covering for the body • Outer layer of skin • Forms membranes and ducts • Lines body cavities and hollow organs
Epithelial Tissue Structure • Classification by shape • Squamous • Cuboidal • Columnar • Classification by layers • Simple • Stratified • Pseudostratified
Epithelial Tissue Simple Epithelium • Single cell layer allows materials to pass from one system to another
Figure 4-1 Simple epithelial tissues. In how many layers are these epithelial cells?
Epithelial Tissue Stratified Epithelium • Multiple cell layers provide protection in areas subject to wear and tear.
Figure 4-2 Stratified squamous epithelium. What is the function of stratified epithelium?
Special Functions of Epithelial Tissue Special Functions • Goblet cells secrete mucus. • Trap foreign particles in respiratory tract • Protect lining of digestive organs • Some epithelial cells have cilia. • Sweep particles trapped in mucus away from lungs • Epithelial cells repair and replace themselves quickly.
Epithelial Tissue Glands • Produce substances that are sent out to other parts of the body • Types • Exocrine glands • Use ducts to deliver product to other regions • Example: sweat and salivary glands • Endocrine glands • Use blood vessels to deliver hormones to other regions • Example: adrenal gland and pancreas
✓ Epithelial Tissue Checkpoints 4-1 What are the three basic shapes of epithelial cells? 4-2 What are the two categories of glands based on their method of secretion?
? Epithelial Tissue Pop Quiz 4.1 You are studying a slide in anatomy lab. You see several layers of tile-shaped cells. What tissue is most likely on the slide? • Simple columnar epithelium • Stratified columnar epithelium • Simple squamous epithelium • Stratified squamous epithelium
? Epithelial Tissue Pop Quiz Answer 4.1 You are studying a slide in anatomy lab. You see several layers of tile-shaped cells. What tissue is most likely on the slide? • Simple columnar epithelium • Stratified columnar epithelium • Simple squamous epithelium • Stratified squamous epithelium
? Epithelium Pop Quiz 4.2 Which is an example of an endocrine gland? • Glands secrete hydrochloric acid into the stomach. • Pancreas secretes insulin, which regulates blood sugar. • Respiratory epithelium secretes mucus on its surface. • Salivary glands secrete enzymes into the mouth.
? Epithelium Pop Quiz Answer 4.2 Which is an example of an endocrine gland? • Glands secrete hydrochloric acid into the stomach. • Pancreas secretes insulin, which regulates blood sugar. • Respiratory epithelium secretes mucus on its surface. • Salivary glands secrete enzymes into the mouth.
Learning Outcomes 1.I can name the four main groups of tissues and give the location and general characteristics of each. I can give examples of circulating, generalized, and structural connective tissues. Connective Tissue
Connective Tissue Overview • The supporting fabric of the body • Contains large amounts of matrix between cells • Categorized by physical properties • Circulating connective tissue • Generalized connective tissue • Structural connective tissue
Connective Tissue Circulating Connective Tissue • Fluid connective tissue that travels in vessels • Carries nutrients, gases, wastes, and other materials throughout body
Connective Tissue Generalized Connective Tissue • Widely distributed and not highly specialized • Two types • Loose • Dense
Connective Tissue Loose Connective Tissue • Soft matrix • Provides support and protection
Figure 4-4 Circulating and generalized (loose) connective tissue. Which of these tissues has the most fibers? Which of these tissues is modified for storage?
Connective Tissue Dense Connective Tissue • Firm matrix with large numbers of collagen and elastic fibers • Provides protection, support, flexibility, and attachment
Connective Tissue Structural Connective Tissue • Strongest and firmest connective tissue • Mainly associated with skeleton • Two types • Cartilage • Bone
Connective Tissue Cartilage • Strong and flexible with a solid matrix • Provides protection, structure, shock absorption, and elasticity
Connective Tissue Bone • Solid matrix hardened with mineral salts • Makes up bones of skeleton • Gives structure, support, and protection to body • Works with muscles to produce movement
Figure 4-5 Generalized (dense) and structural connective tissue.
✓ Connective Tissue Checkpoints 4-3 What is the general name for the intercellular material in connective tissue? 4-4 What protein makes up the main fibers in connective tissue? 4-5Give some examples of circulating, generalized, and structural connective tissue.
? Connective Tissue Pop Quiz 4.3 Chondrocytes are to cartilage as osteocytes are to • Bone • Fat • Muscle • Tendon
? Connective Tissue Pop Quiz Answer 4.3 Chondrocytes are to cartilage as osteocytes are to • Bone • Fat • Muscle • Tendon
? Connective Tissue Pop Quiz 4.4 You are studying a slide of a body tissue in anatomy lab. You see a few, similar cells that do not contact each other and many thick collagen fibers oriented in the same direction. What tissue is most likely on the slide? • Areolar connective tissue • Dense connective tissue • Stratified epithelial tissue • Transitional epithelial tissue
? Connective Tissue Pop Quiz Answer 4.4 You are studying a slide of a body tissue in anatomy lab. You see a few, similar cells that do not contact each other and many thick collagen fibers oriented in the same direction. What tissue is most likely on the slide? • Areolar connective tissue • Dense connective tissue • Stratified epithelial tissue • Transitional epithelial tissue
Learning Outcomes I can name the four main groups of tissues and give the location and general characteristics of each. Muscle Tissue
Muscle Tissue Types • Skeletal muscle • Voluntary • Striated • Cardiac muscle (myocardium) • Involuntary • Contains intercalated disks • Smooth muscle (visceral muscle) • Involuntary • Unstriated
✓ Muscle Tissue Checkpoints 4-6 What are the three types of muscle tissue?
? Muscle Tissue Pop Quiz 4.4 Which tissue is striated and under involuntary control? • Areolar connective tissue • Cardiac muscle tissue • Skeletal muscle tissue • Smooth muscle tissue
? Muscle Tissue Pop Quiz Answer 4.4 Which tissue is striated and under involuntary control? • Areolar connective tissue • Cardiac muscle tissue • Skeletal muscle tissue • Smooth muscle tissue
Learning Outcomes Name the four main groups of tissues and give the location and general characteristics of each. Nervous Tissue
Nervous Tissue Overview • Nervous tissue makes up body’s communication system • Nervous system components • Brain • Nerves • Spinal cord • Cell types • Neuron • Neuroglia
Nervous Tissue The Neuron • Basic unit of nervous tissue • Neurons transmit nerve impulses. • Parts of a neuron • Body • Fibers • Dendrites • Axon • A nerve is a bundle of nerve fibers held together with connective tissue. • Some nerve fibers are myelinated.
Nervous Tissue Neuroglia • Support and protect nervous tissue • Some protect brain from harmful substances • Some get rid of foreign organisms and cellular debris • Some form myelin sheath around axons • Do not transmit nerve impulses
✓ Nervous Tissue Checkpoints 4-7 What is the basic cell of the nervous system and what is its function? 4-8What are the nonconducting support cells of the nervous system called?
? Nervous Tissue Pop Quiz 4.5 Which fiber conducts a nerve impulse away from a neuron cell body? • Axon • Dendrite • Fibril • Oligocyte
