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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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