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  2. Gating (electrophysiology) - Wikipedia

    en.wikipedia.org/wiki/Gating_(electrophysiology)

    When an action potential occurs in a cell, the electrical signal reaches the presynaptic terminal and the depolarization causes calcium channels to open, releasing calcium to travel down its electrochemical gradient. This influx of calcium subsequently is what causes the neurotransmitter vesicles to fuse with the presynaptic membrane. [16]

  3. Cell cycle checkpoint - Wikipedia

    en.wikipedia.org/wiki/Cell_cycle_checkpoint

    Compared to the eukaryotic cell cycle, the prokaryotic cell cycle (known as binary fission) is relatively simple and quick: the chromosome replicates from the origin of replication, a new membrane is assembled, and the cell wall forms a septum which divides the cell into two. [7]

  4. Spindle checkpoint - Wikipedia

    en.wikipedia.org/wiki/Spindle_checkpoint

    Three types of cell division: binary fission (taking place in prokaryotes), mitosis and meiosis (taking place in eukaryotes).. When cells are ready to divide, because cell size is big enough or because they receive the appropriate stimulus, [20] they activate the mechanism to enter into the cell cycle, and they duplicate most organelles during S (synthesis) phase, including their centrosome.

  5. Ion channel - Wikipedia

    en.wikipedia.org/wiki/Ion_channel

    Ion channels may be classified by gating, i.e. what opens and closes the channels. For example, voltage-gated ion channels open or close depending on the voltage gradient across the plasma membrane, while ligand-gated ion channels open or close depending on binding of ligands to the channel. [14]

  6. Cell cycle - Wikipedia

    en.wikipedia.org/wiki/Cell_cycle

    The eukaryotic cell cycle consists of four distinct phases: G 1 phase, S phase (synthesis), G 2 phase (collectively known as interphase) and M phase (mitosis and cytokinesis). M phase is itself composed of two tightly coupled processes: mitosis, in which the cell's nucleus divides, and cytokinesis, in which the cell's cytoplasm and cell membrane divides forming two daughter cells.

  7. Central canal - Wikipedia

    en.wikipedia.org/wiki/Central_canal

    The central canal (also known as spinal foramen or ependymal canal) is the cerebrospinal fluid-filled space that runs through the spinal cord. [1] The central canal lies below and is connected to the ventricular system of the brain , from which it receives cerebrospinal fluid, and shares the same ependymal lining.

  8. Feeling so tired all the time? Iron deficiency might be the ...

    www.aol.com/lifestyle/feeling-tired-time-iron...

    Iron deficiency can also cause shortness of breath, and amplify the symptoms of any chronic condition, such as depression. It can also have an affect on your mood, ability to focus and sleep quality .

  9. Mitogen - Wikipedia

    en.wikipedia.org/wiki/Mitogen

    In the presence of mitogens, sufficient cyclin D1 can be produced. This process cascades onwards, producing other cyclins which stimulate the cell sufficiently to allow cell division. While animals produce internal signals that can drive the cell cycle forward, external mitogens can cause it to progress without these signals. [2]