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Chapter 4: Tissue Level of Organization

Chapter 4: Tissue Level of Organization. Honors Anatomy & Physiology Ms. Susan Chabot. Definitions. Tissues : collections of specialized cells and cell products that perform a limited number of functions. Histology : the study of tissues

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Chapter 4: Tissue Level of Organization

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  1. Chapter 4: Tissue Level of Organization Honors Anatomy & Physiology Ms. Susan Chabot

  2. Definitions • Tissues: collections of specialized cells and cell products that perform a limited number of functions. • Histology: the study of tissues • Interstitial Fluid: the fluid found between cells, within a tissue, or between tissues

  3. Tissue Classifications • Epithelial Tissue • Layers of cells that cover internal and external surfaces. • Connective Tissue • Connects the epithelium to the rest of the body. • Connects other internal tissues together. • Muscle Tissue • Produce movement • Neural Tissue • Specialized for conduction of electrical impulses.

  4. Characteristics Cellularity: cells bound together. Attachment: cells assist in binding other tissue types together or to underlying layers Avascularity: lack rich blood vessels. Regeneration: continuously replaced through stem cell regeneration. Epithelial Tissue

  5. Epithelia Provides physical protection. Controls permeability. Provides sensations. Producessecretions. Glandular Produces secretions in specialized structures called glands. Releases secretions onto surface of epithelium or released into interstitial fluid or blood. Epithelial Tissue

  6. Characteristics Varies widely in appearance. Highly vascular Contain sensory receptors Functions Establish structural framework. Transport fluids and dissolved materials. Protect delicate organs Support, surround, interconnect other tissues. Store energy reserves. Defense from invading microorganisms. Connective Tissue

  7. Connective Tissue

  8. Connective Tissue

  9. Characteristics Voluntary vs. involuntary Striated vs. non-striated Functions Specialized for contraction. Produces movement of structures and substances. Muscle Tissue

  10. Muscle Tissue • 3 Muscle Types • Skeletal muscle: attaches and moves the skeleton • Cardiac muscle: allows for pumping action of the heart to move blood. • Smooth/visceral muscle: allows for squeezing action to move food through digestive system. • Peristalsis: squeezing contraction Cardiac Muscle Skeletal Muscle Smooth/Visceral Muscle

  11. Characteristics 98% is concentrated in brain and spinal cord. Two cells types, neurons and neuroglia. Functions Conduction of electrical impulses. Collect stimuli Integrate response Neural Tissue

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