Human Body Systems Classification

A distinct structural unit made up of different types of tissue = Organ Living matter of any one particular type, both structural and functional, composed of more or less uniformed cells = Tissue A unit from which living matter is built up, consists of protoplasm and nucleus = Cell Watery fluid percolating through all the minute spaces among the cells of the body = Tissue fluid

Nutrients diffuse out of capillary blood vessels into this fluid from which they are absorbed by the cells = Tissue fluid Waste products are transferred from the cells via the tissue fluid to the blood and lymph = Tissue fluid Dissolved substances diffuse from zones of high concentration to zones of low concentration = Diffusion If the blood ceases to flow, the concentrations become balanced and diffusion stops = Diffusion

Ectoderm = Primitive cell type Mesoderm = Primitive cell type Endoderm = Primitive cell type Derived from three primitive cell types: ectoderm, mesoderm, and endoderm = All tissues of the body

<p>Epithelial tissue = Includes the outer layer of the skin and lining membranes of hollow organs Mechanical tissue = Consists of bone, cartilage, and connective tissues where ground substance is important Muscular tissue = Comprised of smooth-muscle cells, cross-striated muscle cells, and heart-muscle cells Nervous tissue = Forms the whole nervous system and behaves differently from outer skin</p> Signup and view all the answers

<p>Parenchyma = Specialized working tissue of an organ Stroma = Supporting tissue holding the parenchyma together Ground substance = More important than cells in mechanical tissues like bone and cartilage Cells = Closely packed in tissues like epithelium with little ground-substance</p> Signup and view all the answers

<p>True epithelium = Includes the outer layer of the skin and lining membranes of hollow organs Connective tissues = Mechanical tissues where ground substance is more important than cells Smooth-muscle cells = Part of muscular tissues along with cross-striated and heart-muscle cells Nervous system = Formed by nervous tissue that behaves differently from outer skin</p> Signup and view all the answers

<p>Bone = Part of mechanical tissues where ground substance is crucial Heart = Contains heart-muscle cells as part of muscular tissues Skin = Comprised of true epithelium as well as mechanical and nerve tissues Brain = Mainly composed of nervous tissue forming the nervous system</p> Signup and view all the answers

<p>Parenchyma = Specialized working tissue of the organ Stroma = Less evolved supporting tissue holding the parenchyma together Epithelial tissue = Includes true epithelium such as the outer layer of the skin Mechanical tissue = Includes tissues like bone and cartilage where ground substance is more important than cells</p> Signup and view all the answers

<p>Smooth-muscle cells = Type of highly specialized cells in muscular tissues Cross-striated muscle cells = Another type of highly specialized cells in muscular tissues Heart-muscle cells = Third type of highly specialized cells in muscular tissues Nerve tissue = Forms the whole nervous system and behaves differently than skin</p> Signup and view all the answers

<p>True epithelium = Type of epithelial tissue found in skin and lining membranes Bone tissue = Type of mechanical tissue where ground substance is crucial Smooth-muscle tissue = Type of muscular tissue with smooth-muscle cells Nervous tissue = Tissue forming the entire nervous system, separate from skin</p> Signup and view all the answers

<p>General organs = Composed of parenchyma and stroma Epithelial tissues = Closely packed cells with little ground-substance Muscular tissues = Comprising smooth-muscle, cross-striated, and heart-muscle cells Nervous system = Arises from same layer as skin but behaves differently</p> Signup and view all the answers

<p>Skin = True epithelium as outer layer and mechanical tissues like bone Liver = Parenchyma and stroma components Heart = Muscular tissue with heart-muscle cells Brain = Mainly composed of nervous tissue</p> Signup and view all the answers

<p>Tightly packed cells with little ground-substance = Epithelial tissues More focus on ground substance than cells produced = Mechanical tissues Highly specialized smooth-muscle cells = Muscular tissues Forming the entire nervous system separately classified from skin = Nervous tissue</p> Signup and view all the answers

<p>Heart = Cardiovascular system Stomach = Digestive system Lungs = Respiratory system Kidneys = Excretory system</p> Signup and view all the answers

<p>Organ = Different types of tissue Tissue = Living matter of one type Cell = Protoplasm and nucleus Matrix = Homogeneous ground-substance</p> Signup and view all the answers

<p>Tissue fluid = Percolating through cells Blood = Transferring waste products Lymph = Transferring waste products Capillary blood vessels = Diffusing nutrients</p> Signup and view all the answers

<p>Diffusion = Balancing concentrations Filtration = Impermeable to large molecules Absorption = Cells taking in nutrients Percolation = Fluid moving between cells</p> Signup and view all the answers

<p>Ectoderm = Skin and nervous tissue Mesoderm = Muscle and bone tissue Endoderm = Digestive and respiratory tissue Diffusion stops. =</p> Signup and view all the answers

<p>Protoplasm and nucleus = Basic building blocks Capillaries = Acting as filters Cells walls = Maintaining cell integrity Ground-substance =</p> Signup and view all the answers