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Revise cells of the nervous system and neurotransmitters at synapses with this BBC Bitesize Scotland Higher Human Biology guide to the SQA course.
- Neurotransmitter Effects on Mood and Behaviour
Higher; Cells of the nervous system, neurotransmitters at...
- Neurotransmitter Effects on Mood and Behaviour
- Gap Junction Definition
- Function of Gap Junctions
- Gap Junction Structure
- Other Cell Junctions
- Related Biology Terms
- Quiz
- References
Gap junctions are a type of cell junction in which adjacent cells are connected through protein channels. These channels connect the cytoplasm of each cell and allow molecules, ions, and electrical signals to pass between them. Gap junctions are found in between the vast majority of cells within the body because they are found between all cells tha...
The main function of gap junctions is to connect cells together so that molecules may pass from one cell to the other. This allows for cell-to-cell communication, and makes it so that molecules can directly enter neighboring cells without having to go through the extracellular fluid surrounding the cells. Gap junctions are especially important duri...
In vertebrate cells, gap junctions are made up of connexin proteins. (The cells of invertebrates have gap junctions that are composed of innexin proteins, which are not related to connexin proteins but perform a similar function.) Groups of six connexins form a connexon, and two connexons are put together to form a channel that molecules can pass t...
The two other types of cell junctions in vertebrates are anchoring junctions and tight junctions. Anchoring junctions adhere cells through proteins that are connected to the cell’s cytoskeleton. Tight junctions are areas where cells are bound very closely together to form a barrier, and they are often found in epithelial cells, which are cells foun...
Anchoring junction– A type of cell junction in which cells are connected by a mass of proteins.Tight junction– A type of cell junction where cells are tightly bonded to form a barrier.Plasmodesmata– Channels that connect the cytoplasm of adjacent plant cells.Connexin– A family of proteins that makes up gap junctions.1. How many connexins are found in one gap junction channel? A. 6 B. 4 C. 12 D.2 2. What is the “bystander effect” in relation to gap junctions? A. Molecules can enter neighboring cells without passing through extracellular fluid. B. Cells next to a cell that is undergoing cell death can also die. C. Cells can transmit therapeutic compounds to one ...
Alberts, Bruce, et al. (1994). Molecular Biology of the Cell, 3rd. ed.Ch. 1. Garland Science: New York. ISBN: 978-0815316206.Davidson, Michael W. (2015-11-13). “Plasmodesmata”. Molecular Expressions Cell Biology.Retrieved 2017-04-13 from https://micro.magnet.fsu.edu/.Evans, W.H. and Martin, P.E. (2002). “Gap junctions: structure and function (Review)”. Mol. Membr. Biol.19 (2): 121–36.Kimball, John W. (2015-03-02). “Junctions Between Cells”. Kimball’s Biology Pages.Retrieved 2017-04-12 from http://www.biology-pages.info/.Connection for AP ® Courses. The cell cycle describes an orderly sequence of events that are highly regulated. In eukaryotes, the cell cycle consists of a long preparatory period (interphase) followed by mitosis and cytokinesis. Interphase is divided into three phases: Gap 1 (G 1), DNA synthesis (S), and Gap 2 (G 2).
Definition. Gap junctions are specialized intercellular connections between certain animal cell-types that directly connect the cytoplasm of two cells, allowing various molecules, ions and electrical impulses to pass freely between cells.
Dec 18, 2016 · Here, we cover the basics of the Endosymbiotic Theory and the Origin of Cell Compartmentalization - section 2.11 of the AP Biology curriculum.
AP Biology glossary of key terms with definitions, must-know facts, and related terms you need to know for your exam.
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Gap junctions are aggregates of intercellular channels that permit direct cell–cell transfer of ions and small molecules. Initially described as low-resistance ion pathways joining excitable cells (nerve and muscle), gap junctions are found joining virtually all cells in solid tissues.
