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    Endocytosis and Exocytosis

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    tituslivius27
    Endocytosis and exocytosis are processes cells use to transport materials. Endocytosis involves a cell absorbing materials by engulfing them and forming vesicles inside the cell, requiring energy. Exocytosis involves vesicles fusing with the cell membrane and releasing their contents outside the cell. These processes allow cells to import and export various molecules and proteins.

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    Endocytosis and Exocytosis

    Uploaded by

    tituslivius27
    241 views2 pages
    Endocytosis and exocytosis are processes cells use to transport materials. Endocytosis involves a cell absorbing materials by engulfing them and forming vesicles inside the cell, requiring energy. Exocytosis involves vesicles fusing with the cell membrane and releasing their contents outside the cell. These processes allow cells to import and export various molecules and proteins.

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    the different types of endo and exocytosis.

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    Endocytosis and exocytosis are processes cells use to transport materials. Endocytosis involves a cell absorbing materials by engulfing them and forming vesicles inside the cell, requiring energy. Exocytosis involves vesicles fusing with the cell membrane and releasing their contents outside the cell. These processes allow cells to import and export various molecules and proteins.

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    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    241 views2 pages

    Endocytosis and Exocytosis

    Uploaded by

    tituslivius27
    Endocytosis and exocytosis are processes cells use to transport materials. Endocytosis involves a cell absorbing materials by engulfing them and forming vesicles inside the cell, requiring energy. Exocytosis involves vesicles fusing with the cell membrane and releasing their contents outside the cell. These processes allow cells to import and export various molecules and proteins.

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    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 2

    Endocytosis and Exocytosis

    Endocytosis = The process of taking materials into a cell by


    surrounding them with part of the plasma membrane, which then
    pinches off to form a vesicle inside the cell. This is an active process
    involving ATP.- Textbook ; -------is an energy-using process by which
    cells absorb molecules (such as proteins) by engulfing them. It is used by
    all cells of the body because most substances important to them are
    large polar molecules that cannot pass through the hydrophobic plasma
    or cell membrane. The opposite process is exocytosis.- Wikipedia.;


    Exocytosis = The process of removing materials from the cell by fusing vesicles
    containing the material with the plasma membrane - Textbook--------- is the durable, energy-
    consuming process by which a cell directs the contents of secretory vesicles out of the cell
    membrane and into the extracellular space. These membrane-bound vesicles contain soluble
    proteins to be secreted to the extracellular environment, as well as membrane proteins and lipids
    that are sent to become components of the cell membrane.- Wikipedia

    Neuron A (transmitting) to neuron B (receiving)
    1. Mitochondrion
    2. Synaptic vesicle with neurotransmitters
    3. Auto receptor
    4. Synapse with neurotransmitter released (serotonin)
    5. Postsynaptic receptors activated by neurotransmitter (induction of a postsynaptic potential)
    6. Calcium channel
    7. Exocytosis of a vesicle
    8. Recaptured neurotransmitter components of the cell membrane.



    Type of bulk transport Description/ definition Examples



    Phagocytosis


    One of three types of endocytosis. It means cellular eating, part
    of the plasma membrane engulfs the particle. Mainly used by
    unicellular protists, and white blood cells.




    Pinocytosis


    Another type of endocytosis. Small vesicles pinch off from
    the plasma membrane, bringing small dissolved substances. It
    means cellular drinking




    Receptor meditated
    endocytosis


    Used by animal cells to capture specific macromolecules from
    the cells environment. This process uses



    Endocytosis

    Composed of 3 different methods that a cell can absorb
    substances that are bigger and/or polar which the cell
    membrane cannot allow through since it is semi-permeable.



    A) Secretory vesicles: The secretary vesicle is a type of transporter organelle that is used to deliver particles
    within the cell or from the cell to outside of the cell.
    B) Invagination : the action or process of being turned inside out or folded back on itself to form a cavity or
    pouch.#
    2. a) ----
    2. b) The hypothalamus is responsible for regulating the release of
    hormones from the pituitary gland. It is responsible for secreting releaser
    factors which instruct the pituitary gland to secret certain hormones. This is
    illustrated below.

    In Figure 1 above, the releaser hormone from the hypothalamus finds
    its target tissue, a pituitary cell. It binds to the receptor where a
    chemical messenger instructs the cell to release the desired hormone.
    In figure 2, the messenger may instruct the release of the hormone, or
    bind to the receptor and enter the nucleus to instruct the production
    of a particular hormone
    Finally, the secreted hormone will target a specific tissue (for instance the thyroid gland) and instruct the
    tissue to produce a particular substance source -----
    http://www.biology-online.org/3/3_hormone_production.htm

    -It is important that this happens fast and this is done by the use of Pinocytosis. This means that the hormone is
    released and absorbed quickly, using the same process.

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