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from Zemlin text

        Help!  

Term
Definition
Ventral   towards the front  
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Anterior   towards the back  
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Posterior   towards the back  
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Cranial (rostral)   towards the head  
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Caudal   towards the tail  
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Medial   towards the midline  
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Lateral   away from the midline  
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Superficial   towards the surface of the body  
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Deep   away from the surface of the body  
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Proximal   closer to center of body; closer to attachment of limb to torso  
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Distal   away from attachment to body  
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Frontal   plane that divides body into a front and back part  
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Sagittal   plane that divides body into right and left parts  
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Transverse   plane that divides body into top and bottom parts  
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Cell   basic organizational unit of all living organisms  
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cytology   scientific study of cells  
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Cytoplasm   part of the cell that's enclosed within the plasma membrane  
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Protoplasm   living contents of a cell that are surrounded by a plasma membrane  
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DNA   molecules comprising genes  
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Organelle   specialized subunit within a cell that has a specific function and is usually separately enclosed within its own lipid membrane  
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Cell Membrane   made up of lipid molecules comprised in a dipole or bilayer and various types of protein molecules  
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Microfilaments   membrane bound channels within cells  
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Microvilli   slender hair-like extensions of the outer membrane wall of cells  
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Cell Nucleus   control center of cell, which contains the cell's chromosomes  
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Endoplasmic Reticulum   eukaryotic organelle that forms an interconnected network of tubules, vessicles, and cistern within cells  
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Rough ER   important for synthesis of proteins  
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Smooth ER   important for synthesis of non-proteins, such as fluids  
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Mitochondria   membrane-bound organelles within cytoplasm with a variety of functions: respiration, making chemical energy that is derived from breakdown of organic compounds  
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Lysosomes   membrane-bound organelles within cytoplasm; responsible for removing material from the cytoplasm; intracellular scavengers  
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Golgi Complex   consists of one or more zones of smooth ER; important as secretory structures  
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Epithelium   tissue composed of cells that line the cavities and surfaces of structures throughout the body  
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Connective Tissue   binds structures together, supports the body  
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Muscle Tissue   contractive tissue of the body; derived from the mesodermal layer of embryonic germ cells  
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Neural Tissue   main component of nervous system: brain, spinal cord, nerves; regulates and controls body functions  
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Vascular Tissue   liquid tissue such as blood and lymph  
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Proper Epithelium   epithelial cells that form the outer layer of the body and the internal membranes that are continuos with the outside of the body (mucous membranes)  
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Simple Epithelium   single layers resting on a basement membrane of connective tissue  
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Squamous Epithelium   simple epithelium where the cells form a flat pavement-like surface  
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Columnar Epithelium   cylindrical cells; form a palisade-like layer  
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Stratified Epithelium   several layers of cells where the deep layers are columnar, and surface is approached, cells become more flattened and polygonal  
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Pseudostratified Epithelium   single layer of cells where the cell nuclei are at irregular levels  
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Pseudostratified Ciliated Epithelium   pseudostratified cells with cilia on the exposed surface (respiratory tract)  
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Epidermis   skin; ET that forms the outer surface of the body  
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Transitional Epithelium   tissue consisting of multiple layers of epithelial cells which can contract and expand; found in urinary tract, particularly urinary bladder  
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Glands   specialized epithelial cells for the secretion of substances  
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Ectoderm   lines external surfaces (skin) and alimentary tract  
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Endoderm   lines respiratory tract; epithelium of respiratory tract  
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Goblet Cells   in mucous membranes; secrete mucin (exocrine cells)  
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Keratin   protein which waterproofs membrane (skin)  
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Non-Keratized   no waterproofing properties (mucous membranes)  
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Mesoderm Tissue   lines internal cavities (heart, vessels, lungs)  
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System   two or more organ combine to form a functional unit; skeletal, reproductive, endocrine, integumentary, articular, muscular, digestive, vascular, nervous, respiratory, urinary  
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Organ   two or more tissues combined to form a structure with functional unity; ex: larynx  
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Lymphocytes   cells in lymphatic system; recognize foreign materials and eliminate them from the body  
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White Blood Cells   involved in body defense mechanisms  
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Red Blood Cells   contains hemoglobin for binding with oxygen  
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Plasma   clear, slightly yellowish fluid containing inorganic ions, immunoglobulins, proteins (clotting) and other materials such as steroids  
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Neurons   cells in the nervous system  
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Muscle Insertion   attachment of muscle that moves  
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Muscle Origin   attachment of muscle that doesn't move  
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Synergist Muscle   muscle that works with others to facilitate each other's movement  
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Antagonist Muscle   muscle that works against another muscle  
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Agonist Muscle   muscle that works with another muscle  
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Cardiac Muscle   muscle forming the heart  
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Smooth Muscle   involuntary, slow contracting muscle  
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Striated Muscle   voluntary muscle important for body movement and posture  
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Triponin   protein molecule attached to actin in muscle cells  
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Sarcolemma   outer membrane wall of muscle cells  
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Transverse Tubules   deep invagination of the sarcolemma which is the plasma membrane, only found in skeletal and cardiac muscle cells; allow depolarization of the membrane to quickly penetrate to the interior of the cell  
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Sarcoplasmic Reticulum   membrane bound channels with muscle cells that store calcium  
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Actin   muscle protein involved in contraction  
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Myofilaments   basic molecular structure of muscle  
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Myofibril   groups of muscle proteins surrounded by sarcoplasmic reticulum  
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Muscle Fiber   bundles of muscle cells surrounded by fascia  
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Amphiarthrodial Joints   allow a little movement  
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Diarthrodial Joints   allow ample movement in one or more directions  
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Synarthrodial Joints   suture, immovable joints  
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Joints   connections between two bones or cartilages  
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Bone Marrow   flexible tissue found in the hollow interior of bones; In adults, in large bones produces new bloods cells  
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Cancelous Bone   spongy; interior network of fibers and channels on the inside of bones  
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Haversian Canals   network of fibers and channels within bones  
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Osteoblasts   cells that are responsible for bone formation  
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Periosteum   membrane covering outer surface of bones  
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Bone   densest of connective tissue; inorganic salts (calcium) provides hardness and brittleness  
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Fibrocartilage   stiff yet flexible; made of collagen and elastin; provides a strong cushion such as between vertebrae bodies  
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Elastic Cartilage   more elastic fibers make this yellowish; more flexible; found in ears and nose  
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Hyaline Cartilage   bluish-white; covers the ends of bones and provides smooth articulation for joints  
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Chondroblasts   cells responsible for cartilage formation  
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Cartilage   stiff yet flexible connective tissue; joins between bones, rib cage, ear, nose, bronchial tubes, intervertebral discs  
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Special Dense Connective Tissue   composed of cells (chondroblasts) located in spaces called lacunae surrounding the lacunae are ground matrix and fibers-- cartilage and bone  
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Reticular Connective Tissue   fibers forma soft skeleton (stroma) to support the lymphoid organs (lymph nodes, red bone marrow, spleen)  
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Fascia   dense connective tissue surrounding organs or muscles  
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Ligament   dense connective tissue connecting bone to bone or cartilage to cartilage  
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Aponeurosis   flat sheet of connective tissue forming attachment to muscles  
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Tendon   dense connective tissue connecting muscles to bone or cartilage  
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Collagen   one of long fibrous structural proteins whose functions are a major component of the extracellular matrix that supports most tissues and gives cells structure from the outside  
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Elastin   protein giving elastic properties to tissue  
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Dense Connective Tissue   characterized by densely packed fibers of collagen or elastin  
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Loose Connective Tissue   very loose/irregular; forms the bed for other tissues such as the skin  
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Eukaryotic   cells with nucleus  
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Exocrine   producing secretion that's released outside its source  
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