Human Tissue Types
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Epithelial Tissue

  • Forms the lining of organs, glands, and body surfaces
  • Functions:
    • Protection and barrier function
    • Absorption and secretion
    • Sensation and filtration
  • Types:
    • Squamous (flat, plate-like cells)
    • Cuboidal (cube-shaped cells)
    • Columnar (tall, column-like cells)
    • Transitional (specialized cells that can stretch)
  • Locations:
    • Skin and mucous membranes
    • Glands and organs
    • Lining of blood vessels and body cavities

Connective Tissue

  • Supports and connects body organs and tissues
  • Functions:
    • Providing structure and support
    • Connecting and binding organs
    • Storing energy reserves
    • Protecting body organs
  • Types:
    • Loose connective tissue (areolar tissue)
    • Dense connective tissue (tendons and ligaments)
    • Cartilage
    • Bone
    • Adipose tissue (fat)
  • Locations:
    • Skin and subcutaneous tissue
    • Bones and joints
    • Organs and glands
    • Blood vessels and nerves

Muscle Tissue

  • Responsible for movement and contraction
  • Functions:
    • Movement and locomotion
    • Maintaining posture and balance
    • Regulating body temperature
    • Supporting respiratory and circulatory functions
  • Types:
    • Skeletal muscle (voluntary, striated)
    • Smooth muscle (involuntary, non-striated)
    • Cardiac muscle (involuntary, striated)
  • Locations:
    • Skeletal muscles: attached to bones and skin
    • Smooth muscle: in walls of hollow organs and blood vessels
    • Cardiac muscle: heart

Nervous Tissue

  • Responsible for transmitting and processing information
  • Functions:
    • Receiving and transmitting sensory information
    • Integrating and processing information
    • Controlling muscle and gland function
  • Types:
    • Neurons (nerve cells)
    • Neuroglial cells (supporting cells)
  • Locations:
    • Central nervous system (brain and spinal cord)
    • Peripheral nervous system (nerves and ganglia)

Adipose Tissue

  • Specialized connective tissue for energy storage
  • Functions:
    • Energy storage and release
    • Insulation and thermoregulation
    • Cushioning and support
  • Locations:
    • Subcutaneous layer (beneath the skin)
    • Around organs and glands
    • In bone marrow and yellow bone marrow

Epithelial Tissue

  • Forms the lining of organs, glands, and body surfaces, providing protection and barrier function
  • Enables absorption and secretion in glands and organs
  • Facilitates sensation and filtration in sensory organs and kidneys
  • Consists of squamous, cuboidal, columnar, and transitional cells
  • Found in skin and mucous membranes, glands and organs, and lining of blood vessels and body cavities

Connective Tissue

  • Provides structure and support to body organs and tissues
  • Connects and binds organs, storing energy reserves and protecting body organs
  • Classified into loose, dense, cartilage, bone, and adipose tissue
  • Supports skin and subcutaneous tissue, bones and joints, organs and glands, and blood vessels and nerves

Muscle Tissue

  • Enables movement and contraction, maintaining posture and balance
  • Regulates body temperature and supports respiratory and circulatory functions
  • Comprises skeletal, smooth, and cardiac muscle types
  • Found in skeletal muscles attached to bones and skin, smooth muscle in walls of hollow organs and blood vessels, and cardiac muscle in the heart

Nervous Tissue

  • Transmits and processes information, receiving and transmitting sensory information
  • Integrates and processes information, controlling muscle and gland function
  • Consists of neurons and neuroglial cells
  • Found in the central nervous system (brain and spinal cord) and peripheral nervous system (nerves and ganglia)

Adipose Tissue

  • Specialized connective tissue for energy storage, releasing energy as needed
  • Provides insulation and thermoregulation, cushioning and support
  • Located in the subcutaneous layer, around organs and glands, and in bone marrow and yellow bone marrow

Body Tissues

Epithelial Tissue

  • Lines organs, glands, and body surfaces
  • Functions: protection, absorption, regulation, and sensing
  • Four types: squamous (flat), cuboidal (cube-shaped), columnar (column-shaped), and transitional (stretchy)

Connective Tissue

  • Provides support, structure, and connectivity to the body
  • Functions: binding, protection, energy storage, and transport of nutrients and waste
  • Five types: loose connective tissue (areolar, adipose), dense connective tissue (tendons, ligaments), cartilage, bone, and blood

Muscle Tissue

  • Responsible for movement and contraction
  • Functions: movement, posture, and temperature regulation
  • Three types: skeletal muscle (voluntary, striated), smooth muscle (involuntary, non-striated), and cardiac muscle (involuntary, striated)

Nervous Tissue

  • Responsible for transmitting and processing information
  • Functions: receiving and transmitting stimuli, integrating and processing information
  • Two types: neurons (nerve cells) and glial cells (supporting cells)

Adipose Tissue

  • Specialized form of connective tissue
  • Functions: energy storage, insulation, and cushioning
  • Two types: white adipose tissue (energy storage) and brown adipose tissue (heat generation)

Mitochondria

  • Generate energy for the cell through cellular respiration
  • Convert glucose into ATP (adenosine triphosphate)
  • Have their own DNA, known as mtDNA, which is inherited from mother only
  • Consist of two membranes: outer (permeable) and inner (impermeable, folded into cristae)

Endoplasmic Reticulum (ER)

  • A network of membranous tubules and flattened sacs involved in:
    • Protein synthesis and transport
    • Lipid synthesis
    • Detoxification
  • Two types: Rough ER (RER) with ribosomes for protein synthesis, and Smooth ER (SER) for lipid synthesis and detoxification

Ribosomes

  • Small organelles found throughout the cytoplasm responsible for protein synthesis
  • Consist of two subunits: large and small
  • Read messenger RNA (mRNA) sequences and assemble amino acids into polypeptide chains
  • Found attached to the ER (RER) or floating freely in the cytoplasm

Golgi Apparatus

  • A complex of flattened sacs and tubules responsible for:
    • Processing and modifying proteins synthesized by ribosomes
    • Packaging and transporting proteins and lipids to other parts of the cell
    • Modifying carbohydrates on proteins and lipids
  • Receives proteins from the ER and sends them to other organelles or for secretion

Lysosomes

  • Membrane-bound sacs containing digestive enzymes for cellular digestion and recycling
  • Break down proteins, lipids, and carbohydrates using acid hydrolases
  • Fuse with phagosomes to digest engulfed particles
  • Maintain cellular homeostasis by removing damaged or unwanted cellular components

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