Cell Types and Modifications - Page by Page Notes

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  • Topic: CELL TYPES and CELL MODIFICATIONS
  • Source: GILLIAN VALZADO (presentation title shown on page)

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  • Objectives:
    • To identify the parts of each animal tissue.
    • To classify different cell types of animal tissue.
    • To identify and describe different cell modifications.

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  • Hierarchy of Biological Organization: organelles → cells → tissues → organs → organ systems → organism.
  • Form fits function: cell/tissue/organ shape relates to its purpose (example: red blood cell is small and flexible to move through narrow vessels).

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  • Levels in biology (motivation):
    • Atom, Molecule, Cell, Tissue, Organ, Organ system, Organism, Population, Community, Ecosystem, Biosphere

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  • DISCUSSION: Cell Type (header indicates discussion focus; no content provided here)

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  • Four major tissue types in organisms:
    • Epithelial tissue, Connective tissue, Muscle tissue, Nervous tissue
  • All cells share genetic instructions but differ by tissue specialization for shared functions

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  • Four tissue types (ordered):
    • 01 Epithelial tissue
    • 02 Nervous tissue
    • 03 Connective tissue
    • 04 Muscle tissue

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  • Animal tissues overview:
    • Epithelial, Nervous, Muscle, Connective
  • Examples under connective/muscle categories include: Smooth, Blood, Cardiac, Bone, Skeletal, Ligament, Cartilage, Areolar, Adipose

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  • Epithelial tissue types:
    • Simple squamous epithelium
    • Simple columnar epithelium
    • Pseudostratified columnar epithelium
    • Cuboidal epithelium
    • Stratified squamous epithelium
  • Characteristics: covering/lining organs, closely joined cells with tight junctions, barrier against pathogens, fluid loss, etc.

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  • Epithelial cell types and functions:
    • Cuboidal: secretion (cube-shaped cells)
    • Simple columnar: secretion/active absorption
    • Simple squamous: diffusion/exchange of materials
    • Stratified squamous: protection; multilayered and regenerate rapidly
    • Pseudostratified columnar: lining of respiratory tract; often ciliated

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  • Connective tissues: hold tissues together, provide support, can stretch/contract; extracellular matrix separates cells; examples include blood as a specialized connective tissue

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  • Connective Tissue Proper (CTP) and other connective tissues:
    • Blood: liquid extracellular matrix (plasma) with RBCs, WBCs, platelets
    • CTP: loose connective tissue (e.g., adipose), fibrous connective tissue (tendons/ligaments), supporting roles
  • Fiber types in connective tissue: Collagenous, Reticular, Elastic

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  • Blood composition: plasma (water, salts, dissolved proteins) plus cells/fragments (RBCs, WBCs, platelets)
  • Loose connective tissue: adipose tissue (fat storage, insulation) and other loose components
  • Dense fibrous connective tissue: collagen-rich; anchors epithelia; found in tendons/ligaments

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  • Cartilage: collagen fibers in chondroitin sulfate; chondrocytes secrete collagen and chondroitin sulfate; functions as cushion
    • Hyalin cartilage: few collagen; found in joint surfaces
    • Fibrocartilage: abundant collagen; shock absorption (ligaments/tendons)
    • Elastic cartilage: elastic fibers; maintains shape with flexibility
  • Bone: mineralized connective tissue; osteoblasts deposit collagen; minerals (Ca, Mg, phosphate) harden matrix; osteons with central canal; osteocytes; osteoclasts

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  • Connective tissues summary:
    • Loose connective tissue: binds epithelia to underlying tissues; surrounds organs
    • Dense connective tissue: tendons/ligaments; strong collagen presence
    • Bone: mineralized matrix; osteoblasts/osteocytes/osteoclasts; osteons
    • Blood: plasma with formed elements; blood vessels
    • Cartilage: chondrocytes in/chondroitin sulfate; strong yet flexible support
    • Adipose: stores fat; pads and insulates; energy reserve

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  • Muscle tissues:
    • Skeletal: striated, voluntary movement; long fibers; multiple nuclei; attached to bones
    • Cardiac: striated; intercalated disks for synchronized contraction; involuntary; heart muscle
    • Smooth: non-striated; spindle-shaped; involuntary; walls of digestive tract, blood vessels, etc.

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  • Structural features (illustrations):
    • Skeletal muscle: multiple nuclei per fiber; sarcomere structure
    • Smooth muscle: single nucleus per cell; spindle shape
    • Cardiac muscle: intercalated disks between fibers

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  • Nervous tissue:
    • Neurons (nerve cells): transmit nerve impulses; receive via dendrites; send via axons
    • Glial cells (glia): nourish, insulate, replenish neurons
  • Neurites:
    • Dendrites: receive impulses
    • Axon: transmits impulses

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  • Epithelial Tissues Summary: cell shapes and locations
    • Squamous: flat; simple (lung alveoli, capillaries); stratified (skin, mouth, vagina, etc.)
    • Cuboidal: cube-shaped; secretion (kidney tubules, glands)
    • Columnar: tall; secretion/absorption (digestive tract)
    • Pseudostratified: single layer with varying heights; often ciliated in respiratory tract

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  • Connective Tissues Summary (tissue, cells, fibers, location):
    • Loose/Areolar: fibroblasts, macrophages; few fibers; surrounds vessels
    • Dense/ Fibrous: mostly collagen; tendons/ligaments
    • Cartilage: chondrocytes; hyalin/cartilage varieties
    • Bone: osteoblasts/osteocytes/osteoclasts; mineralized
    • Adipose: adipocytes; fat storage
    • Blood: plasma; RBCs/WBCs; platelets; vessels

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  • Connective Tissues Summary (continued):
    • Bone: osteoblasts/osteocytes/osteoclasts; collagen matrix; mineralized
    • Adipose: fat storage; padding/insulation
    • Blood: plasma as liquid matrix; cells and platelets
    • Cartilage: chondrocytes; chondroitin sulfate

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  • Muscle Tissue Summary (type, striations, nuclei, control, location):
    • Smooth: no striations; single central nucleus; involuntary; visceral organs
    • Skeletal: striated; multiple nuclei at periphery; voluntary; skeletal muscles
    • Cardiac: striated; intercalated disks; single nucleus; involuntary; heart

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  • Activity 1: Question prompt – What type of cells are these?

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  • Cell modifications examples:
    • Root hair cell: modified epidermal cell; increases water/mineral absorption; larger vacuoles; penetrates soil particles
    • Cilia: hair-like projections for locomotion (on some cells)
    • Microvilli: increase surface area for absorption (stomach/intestine)
  • Definition: Cell modification is the process after cell division where new cells are structurally modified to perform their function effectively

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  • Graded Recitations (schedule/format not detailed in content)

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  • Recitation numbers (4, 2, 5, 3, 1) appear to be ordering cues for activities

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  • Epithelial Tissue details:
    • Epithelia occur as sheets; line surfaces and cavities; tightly packed; barrier against injury, pathogens, fluid loss
    • Diversity of shapes/arrangements correspond to function
    • Examples:
    • Cuboidal epithelium: secretion (kidney tubules, glands)
    • Simple columnar epithelium: secretion/absorption (intestinal lining)
    • Simple squamous epithelium: diffusion (air sacs, vessels)
    • Pseudostratified epithelium: lining of portions of respiratory tract (often ciliated)
    • Stratified squamous epithelium: multilayered, regenerates rapidly (skin, mouth, vagina, anus)

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  • Polarity of epithelia:
    • All epithelia are polarized with a distinct apical surface facing lumen or outside and a basal surface attached to underlying tissues
    • Apical surface often has microvilli to increase absorption surface area (e.g., small intestine)
    • Basal surface is the opposite side

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  • Otosections and images show:
    • Osteon as the basic bone unit with central canal containing blood vessels and nerves
    • Chondrocytes and chondroitin sulfate in cartilage
    • Fat droplets in adipose tissue
    • Red/White blood cells and plasma in blood

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  • Connective Tissue (expanded):
    • Matrix: extracellular; fibers (collagen, reticular, elastic) in a ground substance
    • Fibroblasts synthesize fibers; macrophages perform phagocytosis
    • Major tissue types (summary): Loose areolar, Dense fibrous, Blood, Cartilage, Bone, Adipose

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  • Muscle Tissue (summary visuals):
    • Skeletal: long fibers, striated, voluntary
    • Cardiac: striated; intercalated disks; involuntary; heart
    • Smooth: non-striated; involuntary; internal organs

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  • Detailed Muscle Types:
    • Skeletal: striated; multiple nuclei; voluntary; attached to bones
    • Smooth: non-striated; single nucleus; involuntary; internal organs
    • Cardiac: striated; intercalated disks; involuntary; heart

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  • (Content appears to be figure/page numbers; no additional instructional text.)

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  • Nervous tissue refresher:
    • Neurons: transmit nerve impulses; receive via dendrites; send via axons
    • Glia: nourish, insulate, replenish neurons; modulate neuron function
    • Neuron anatomy: Dendrites, Cell body, Axon

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  • Activity 4: Draw and label the following animal tissues:
    • Blood, Bone tissue, Epithelial tissue (any kind), Cartilage tissue (any kind), Adipose tissue, Nervous tissue (neurons), Muscle tissue (any kind), Connective tissue (any kind, aside from those already given)

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  • RESOURCES:
    • Mader, Sylvia (2010) Biology 10th edition. McGraw-Hill Science.
    • Reece et al. (2010). Campbell Biology 10th edition. San Francisco (CA).

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