node biology definition
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- Definition of node 1 a: a pathological swelling or enlargement (as of a rheumatic joint) b: a discrete mass of one kind of tissue enclosed in tissue of a different kind
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what is a community.curator..? node is a collection of thoughtfully designed, fully furnished, boutique apartments in the world’s most creative cities. we have re-imagined community living where our residents can connect, meet and collaborate locally and globally.
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Stoga Keystone Bio-All Terms Nucleus. A membrane‐bound organelle in eukaryotic cells functioning to maintain the integrity of the genetic material and, through the expression of that material, controlling and regulating cellular activities.
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The Cell Nucleus By Regina Bailey. Definition: The nucleus is a membrane bound structure that contains the cell's hereditary information and controls the cell's growth and reproduction. It is commonly the most prominent organelle in the cell.
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Lymph node A lymph node is an oval-shaped organ of the lymphatic system, distributed widely throughout the body including the armpit and stomach and linked by lymphatic vessels. Lymph nodes are major sites of B, T, and other immune cells.ymph nodes are bean or oval shaped and range in size from a few millimeters to about 1–2 cm long. Each lymph node is surrounded by a fibrous capsule, and inside the lymph node the fibrous capsule extends to form trabeculae. The substance of the lymph node is divided into the outer cortex and the inner medulla.
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- Cell (biology) The cell (from Latin cella, meaning small room) is the basic structural, functional, and biological unit of all known living organisms. A cell is the smallest unit of life that can replicate independently, and cells are often called the building blocks of life. The study of cells is called cell biology. Cells consist of cytoplasm enclosed within a membrane, which contains many biomolecules such as proteins and nucleic acids.
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- Medical Definition of node. 1  1a: a pathological swelling or enlargement (as of a rheumatic joint)b: a body part resembling a knot; especially : a discrete mass of one kind of tissue enclosed in tissue of a different kind—see atrioventricular node, lymph node.
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Phylogenetic tree In a rooted phylogenetic tree, each node with descendants represents the inferred most recent common ancestor of the descendants, and the edge lengths in some trees may be interpreted as time estimates. Each node is called a taxonomic unit. A Dahlgrenogram is a diagram representing a cross section of a phylogenetic tree. 2  A phylogenetic network is not strictly speaking a tree, but rather a more general graph, or a directed acyclic graph in the case of rooted networks.
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- A node (knot) is a point along a standing wave where the wave has minimal amplitude. The opposite of a node is an antinode, a point where the amplitude of the standing wave is … a maximum. These occur midway between the nodes.found this useful. Alexis Sison.or example, … in a tomato canning plant, inbound logistics is concerned with the receipt and storage of empty cans and raw tomatoes, which arrive separately. Outbound logistics is concerned with the storage of canned tomatoes (the finished product) and despatch to customers.
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Tissue (biology) In biology, tissue is a cellular organizational level intermediate between cells and a complete organ. A tissue is an ensemble of similar cells from the same origin that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues.hey are made up of cells separated by non-living material, which is called an extracellular matrix. This matrix can be liquid or rigid. For example, blood has plasma as its matrix and bone's matrix is rigid.Connective tissue gives shape to organs and holds them in place.
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- Medical Definition of Node, AV. Node, AV: AV node: The AV node (AV stands for atrioventricular) is an electrical relay station between the atria (the upper) and the ventricles (the lower chambers of the heart). Electrical signals from the atria must pass through the AV node to reach the ventricles.
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Node (physics) A node is a point along a standing wave where the wave has minimum amplitude. For instance, in a vibrating guitar string, the ends of the string are nodes. By changing the position of the end node through frets, the guitarist changes the effective length of the vibrating string and thereby the note played.
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Plant stem Stem showing internode and nodes plus leaf petioles. This above-ground stem of Polygonatum has lost its leaves, but is producing adventitious roots from the nodes. A stem is one of two main structural axes of a vascular plant, the other being the root. The stem is normally divided into nodes and internodes: 1  The nodes hold one or more leaves, as well as buds which can grow into branches (with leaves, conifer cones, or inflorescences (flowers)). 2  Adventitious roots may also be produced from the nodes. 3  The internodes distance one node from another.
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Lymph nodes Lymph nodes. Overview. The lymphatic system is a complex network of thin vessels, valves, ducts, nodes, and organs. It helps to protect and maintain the fluid environment of the body by producing, filtering, and conveying lymph and by producing various blood cells. Lymph nodes play an important part in the body's defense against infection.
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CELL Noun. 1. cell nucleus-a part of the cell containing DNA and RNA and responsible for growth and reproduction. karyon, nucleus. cell - (biology) the basic structural and functional unit of all organisms; they may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals.oun. 1. cell nucleus-a part of the cell containing DNA and RNA and responsible for growth and reproduction. karyon, nucleus. cell - (biology) the basic structural and functional unit of all organisms; they may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals.
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- (plural palingeneses). ( 1 biology) The apparent repetition, during the development of a single embryo, of changes that occurred previously in the evolution of its species. ( 2 Christian theology) Spiritual rebirth through the transmigration of the soul in Christian baptism.
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Lymph node A lymph node is an oval- or kidney-shaped organ of the lymphatic system, present widely throughout the body including the armpit and stomach and linked by lymphatic vessels. Lymph nodes are major sites of B, T, and other immune cells.
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Tissue (biology) Microscopic view of a histologic specimen of human lung tissue stained with hematoxylin and eosin. In biology, tissue is a cellular organizational level intermediate between cells and a complete organ. A tissue is an ensemble of similar cells from the same origin that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues. The study of tissue is known as histology or, in connection with disease, histopathology.
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- Cell (biology) The cell (from Latin cella, meaning small room) is the basic structural, functional, and biological unit of all known living organisms. A cell is the smallest unit of life that can replicate independently, and cells are often called the building blocks of life. The study of cells is called cell biology.
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CHAPTER Glossary of Terms. Atrioventricular (AV) Node. Also known as the Aschoff-Tawara node, the AV node is a group of specialized cardiac muscle fibers located at the center of the heart, in the floor of the right atrium, between the atria and ventricles.
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node Nodes are separated by internodes. On the basis of the distance between nodes, shoots are distinguished as being long or short. Nodes form on the growing point of a shoot when the leaf rudiments first appear. At the node the procambial bundles of the developing leaf become embedded in the axis of the shoot.
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Branches of biology Biotechnology - applied science that is concerned with biological systems, living organisms, or derivatives thereof, to make or modify products or processes for specific use. Botany - the scientific study of plants. Cell biology - the study of cells at the microscopic or at the molecular level. It includes studying the cells’ physiological properties, structures, organelles, interactions with their environment, life cycle, division and apoptosis. Chronobiology - a science that studies time-related phenomena in living organisms.
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Definitions &Translations pacemaker, cardiac pacemaker, sinoatrial node, SA node(noun) a specialized bit of heart tissue that controls the heartbeat. Cardiac pacemaker. The contraction of heart muscle in all animals with hearts is initiated by electrical impulses. The rate at which these impulses fire controls the heart rate.
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cell in biology, the unit of structure and function of which all plants and animals are composed. The cell is the smallest unit in the living organism that is capable of integrating the essential life processes.
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node sinoatrial node , sinuatrial node, sinus node a microscopic collection of atypical cardiac muscle fibers (Purkinje fibers) at the junction of the superior vena cava and right atrium, in which the cardiac rhythm normally originates and which is therefore called the cardiac pacemaker.
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A A single-celled organism which does not have a nucleus to store its hereditary material (DNA). Unlike plant and animal cells where the hereditary material (DNA) is linear, in bacteria, DNA is usually circular.