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Anatomy Ch 1
Term | Definition |
---|---|
Primary tissues | Muscle, Nervous, Epithelial, Connective |
Muscle Tissue | Skeletal, Cardiac, Smooth |
Skeletal Muscle | Voluntary, Striated. Attached to bones by tendons, produce skeletal movement. Muscle fibers arranged in bundles, fibers arranged in parallel. |
Cardiac Muscles | Striated, found only in the heart. Myocardial cells are interconnected to form continuous fabric. Intercalated discs couple cells together mechanically and electrically. Syncytium. |
Smooth Muscles | Not striated. Do not contain sarcomeres. Ca2+ combines with calmodulin, activating contraction process. Contain gap junctions. Found in GI tract, blood vessels, bronchioles, ducts of urinary and reproductive systems. |
Nervous Tissue | Neurons (nerve cells): Specialized for action potential conduction. Dendrites: Receive input. Cell body: Nucleus. Metabolic center. Axon: Conducts nerve impulses Supporting cells (neuroglia/glia): Provide anatomical and functional support |
Epithelial | Cells that form membranes Classified according to # of layers and shape of cells in upper layer. Simple: 1 cell thick, used for transport Stratified membranes: Many layers, protective Squamous, columnar, cuboidal |
Squamous Cells | Flattened in shape. Function: Diffusion and filtration. Line all blood vessels, pulmonary alveoli. |
Cuboidal Cells | Cube-shaped cells. Function: Excretion, secretion and absorption. Line kidney tubules, salivary and pancreatic ducts. |
Columnar Cells | Taller column shaped cells. Function: Excretion, secretion and absorption. May contain cilia. Line digestive tract, uterine tubes, and respiratory passageways. |
Exocrine Glands | Derived from cells of epithelial membranes. Secretions are released through ducts. Simple tubes or modified as acini. Examples: Tear glands. Sweat glands. Prostate glands. |
Endocrine Glands | Lack ducts. Secrete hormones into capillaries/lymphatic system within the body. May be discrete organs: Primary functions are the production and secretion of hormones. |
Connective Tissue | Large amounts of extracellular material in the spaces between connective tissue cells. 4 types of connective tissue: Connective tissue proper. (adipose) Cartilage. Bone. Blood. |
Connective Tissue Proper | Loose connective tissue: Scattered collagen & tissue fluid Dermis Dense fibrous connective tissue: Regularly arranged Collagen oriented in same direction Tendon Irregularly " Resists forces applied Capsules & sheaths |
Cartilage | Chondrocytes. Supportive and protective tissue. Elastic properties to tissues. Precursor to many bones. Articular surfaces on joints. |
Bone | Hydroxyapatite crystals. Osteoblasts: Bone-forming cells. Osteocytes: Trapped osteoblasts: less active. Osteoclasts: Bone resorbing cells. |
Blood | Classified as connective tissue. Half its volume is plasma. |
Organs | Are anatomical & functional units made of 2 or more primary tissues |
Organ Systems | groups of organs working together to maintain homeostasis Integumentary Nervous Endocrine Skeletal Muscular Circulatory Immune GI Reproductive |
Body Fluid Compartments | Intracellular compartment—inside the cells Extracellular compartment---outside the cells Blood plasma—fluid portion of blood Tissue fluid or interstitial fluid—fluid that bathes the cells within the body organs |