Bio notes - Nervous Tissue - Conducts nervous impulses from...

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Nervous Tissue - Conducts nervous impulses from one part of the body to another - 2 types of cells o Neurons Generate and conduct nerve impulses o Glial (neurologlia) Surround, support and protect neurons Organs - Formed from at least 2 tissues types that function together - Most organs are housed in body cavities o Dorsal Cranial cavity Spinal cavity o Ventral Thoracic cavity Abdominal cavity Tissue Membranes - Line body cavities and organ systems - Sheets of epithelium supported by connective tissue - Form physical barriers that protect underlying tissues Tissue Membranes - 4 types o Mucous membranes Lines passageways that open to exterior o Serous membranes Line and lubricates body cavities and organs within o Synovial membranes Line cavities between bones of freely movable joints o Cutaneous membranes Skin, covers outside of body Which type of tissue membrane would you find lining the thoracic and abdominal cavity? - Serous membranes Organ Systems - 2 or more organs that work together for a common function - 11 major organ systems The Integumentary System - Composed of the skin and its derivatives - Functions o Protection
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o Regulate body temperature o Production of Vitamin D o Sensation Provide info about external world Skin has 2 layers - Epidermis o Thin outer layer of epithelial tissue Stratified Squamous o Protective barrier - Dermis o Inner layer of connective tissue o Contains blood vessels, nerves, glands, and follicles - Hypodermis o Supportive layer below the skin o Composed of loose connective tissue containing fat cells Surface Epidermal cells of the skin are? - Dead and filled with Keratin o Keratin is a type of intermediate filament Skin Derivatives - Many diverse structures are derived from the epidermis o Hair Dead skin cells filled with keratin and formed into a column o Nails Dead cells designed to protect the tips of our toes and fingers o Glands Oil (sebaceous) Sweat Sebaceous and sweat glands secrete their product into ducts and are thus? - Exocrine glands Homeostasis - A state of relative internal constancy - Must constantly adjust in response to changes in the internal and external environments Homeostasis is maintained by negative feedback - Corrective measures that slow or reverse a variation from the normal value of the factor Homeostatic Control Mechanism - Receptor (sensor)
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o Detects change and sends the information to the control center - Control Center o Compares information from receptors to set point (normal values) - Effector o Carries out selected response o Muscle or gland The Nervous System - Central Nervous System (CNS) o Brain and Spinal Cord - Peripheral Nervous System (PNS) o All nervous tissues outside the CNS Cells of the Nervous System - Neuroglial cells o Glial cells o More numerous o Provide support for neurons o Do not participate directly in the transmission of electrical signals - Neurons o Functional units of the Nervous System o 3 general types of neurons o Neuron structure
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Bio notes - Nervous Tissue - Conducts nervous impulses from...

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