{"id":9541,"date":"2026-06-01T21:33:48","date_gmt":"2026-06-01T21:33:48","guid":{"rendered":"https:\/\/kapdec.com\/help\/?p=9541"},"modified":"2026-06-01T21:33:48","modified_gmt":"2026-06-01T21:33:48","slug":"cell-communication","status":"publish","type":"post","link":"https:\/\/kapdec.com\/help\/cell-communication\/","title":{"rendered":"Cell Communication"},"content":{"rendered":"

Unit: Cell communication and cell cycle<\/strong><\/h2>\n

Chapter: Cell communication<\/strong><\/h3>\n

Reference:<\/em><\/strong> Types of cell communication, The cell signalling pathway, Cell-cell contact<\/em><\/p>\n

 <\/p>\n

Learning objectives<\/strong><\/p>\n

    \n
  • To understand about the process of cell communication and its pathway<\/li>\n
  • To learn about the types of chemicals signalling<\/li>\n<\/ul>\n

     Cell communication is also called as cell signalling. Cell to cell signalling refers to the transfer of information from one cell to another. Cells signal either by direct contact or by releasing certain substances that are taken up by other cells.<\/p>\n

    Types of cell communication<\/strong>: Cell signalling can be intercellular as well as intracellular.<\/p>\n

      \n
    • Intracellular signals are produced by the same cells that receive the signal.<\/li>\n
    •  Intercellular signals travel throughout the body. This permits specific glands to produce signals that act on different tissues.<\/li>\n<\/ul>\n

      The cell signaling pathway consists of 3 stages: <\/strong><\/p>\n

        \n
      • Reception<\/strong> – This is the first stage of the cell signalling pathway. During this stage, a signaling molecule binds to a receptor protein located on the surface of the cell or inside the cell.<\/li>\n
      • Signal Transduction<\/strong> – On binding with the signaling molecule, the receptor protein undergoes a conformational change, which triggers a series of enzyme activations that initiates the process of transduction. The signal transduction stage involves multiple steps in which each relay molecule in the signal transduction pathway triggers changes in the next molecule along the pathway.<\/li>\n
      • Response <\/strong>– In this final stage of the cell signaling pathway, the signal elicits a specific cellular response.<\/li>\n<\/ul>\n

        A ligand or an extracellular signaling molecule is a chemical messenger that is released by the signaling cell.<\/p>\n

        A receptor is a protein that is expressed on the target cell that recognizes and binds to the ligand.<\/p>\n

        The complete process involves the following steps:<\/strong><\/p>\n

          \n
        • A cell that sends out a signal is called a signaling cell. The signal sent out by the signaling cell is called an extracellular signaling molecule or a ligand.<\/li>\n
        • The cell that receives the signal is called the target cell, and it contains proteins that bind to the ligand called receptors.<\/li>\n
        • Target cells can only respond to a signal if they express receptors that can bind to the ligand.<\/li>\n
        • When the signaling molecule binds to the receptor, it alters its activity and shape. This causes a change in the cell.<\/li>\n
        • The signaling molecule is the ligand. Thus, it is the term used for molecules that specifically bind to the other molecules.<\/li>\n
        • The message that the ligand carries is relayed through chemical messengers inside the cell. It causes a change in the cell, such as altering the gene activity.<\/li>\n<\/ul>\n

          Cell-cell contact<\/strong><\/p>\n

            \n
          • It is the direct interaction between the surfaces of the cell.<\/li>\n
          • Fluid-filled channels called plasmodesmata, and gap junctions form these connections between the plasma membranes of neighbouring cells.<\/li>\n
          • This connection between neighbouring cells is called cell-to-cell contact.<\/li>\n<\/ul>\n

            There are four main kinds of chemical signaling found in any multicellular organism, and the main difference between them is the distance that the signals travel to reach the target cell.<\/p>\n

              \n
            • In autocrine signaling, a cell communicates with itself.<\/li>\n
            • In paracrine signaling, a signaling cell communicates to nearby target cells.<\/li>\n
            • In endocrine signaling, a signaling cell releases a ligand that enters the bloodstream to bind distant target cells.<\/li>\n
            • Additionally, direct signaling occurs when cells are in direct contact communicate with each other.<\/li>\n<\/ul>\n

              \"\"<\/p>\n

              Solved examples<\/strong><\/p>\n

              Example 1<\/strong>. The 3 steps of signal transduction in order are:<\/p>\n

                     a) reception, transduction, response <\/p>\n

                     b) response, transduction, reception<\/p>\n

                 c) reception, response, transduction<\/p>\n

                 d) transduction, reception, response<\/p>\n

              Solution 1:<\/strong> a. The 3 steps of signal transduction in order are reception, transduction, response<\/p>\n

              Example 2. When a cell releases a signal molecule into the environment and a few cells in the immediate vicinity respond, this type of signaling is:<\/p>\n

              a) Autocrine signaling b) Paracrine signaling<\/p>\n

                  c)Endocrine signaling d) Synaptic signaling<\/p>\n

                   Solution 2: <\/strong>b. When a cell releases a signal molecule into the environment and a few cells in the immediate vicinity respond, this type of signaling is paracrine signaling.<\/p>\n

                                                      Summary <\/strong><\/p>\n

                \n
              • Cell to cell signalling refers to the transfer of information from one cell to another.<\/li>\n
              • Cell signaling can be intercellular as well as intracellular.<\/li>\n
              • The 3 steps of signal transduction in order are reception, transduction, response<\/li>\n
              • There are four main kinds of chemical signaling found in any multicellular organism, and the main difference between them is the distance that the signals travel to reach the target cell<\/li>\n<\/ul>\n

                 <\/p>\n","protected":false},"excerpt":{"rendered":"

                Unit: Cell communication and cell cycle Chapter: Cell communication Reference: Types of cell communication, The cell signalling pathway, Cell-cell contact   Learning objectives To understand about the process of cell communication and its pathway To learn about the types of chemicals signalling  Cell communication is also called as cell signalling. Cell to cell signalling refers […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[629],"tags":[],"class_list":["post-9541","post","type-post","status-publish","format-standard","hentry","category-ap-biology"],"_links":{"self":[{"href":"https:\/\/kapdec.com\/help\/wp-json\/wp\/v2\/posts\/9541","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kapdec.com\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kapdec.com\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kapdec.com\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kapdec.com\/help\/wp-json\/wp\/v2\/comments?post=9541"}],"version-history":[{"count":0,"href":"https:\/\/kapdec.com\/help\/wp-json\/wp\/v2\/posts\/9541\/revisions"}],"wp:attachment":[{"href":"https:\/\/kapdec.com\/help\/wp-json\/wp\/v2\/media?parent=9541"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kapdec.com\/help\/wp-json\/wp\/v2\/categories?post=9541"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kapdec.com\/help\/wp-json\/wp\/v2\/tags?post=9541"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}