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Exocytosis Exocytosis (below) is an active transport process in which a secretory vesicle fuses with the plasma membrane and expels its contents into the extracellular space. In multicellular organisms, various types of cells (e.g. endocrine cells and nerve cells) are specialized to manufacture products, such as proteins, and then export them from the cell to elsewhere in the body or outside it. (DID YOU KNOW? The contents of the Exocytosis (and its counterpart endocytosis) require energy because they involve maverment of cytoskeletal proteins. vesicle are expelled into the extracellular space. Plasma membrane Vesicle fuses with the plasma membrane. Vesicle from the Golgi carrying molecules for export moves to the perimeter of the cell. From Golgi apparatus Nerve cell NT Golgi apparatus forming vesicles Nerve cell The transport of Golgi vesicles to the edge of the cell and their expulsion from the cell occurs through the activity of the cyloskeleton. This requires energy (ATP). Exocytosis is important in the transport of neurotransmitters into the junction (synapse) between nerve cels to transmit nervous signals. Fungi and bacteria use exocytosis to secrete digestive enzymes, which break down substances extracellularly so that nutrients can be absorbed (by endocytosis). 2. (a) What is the purpose of exocytosis? (b) How does it occur and what cellular components are involved? ? 3. Describe two examples of the purpose of exocytosis in cells: (a) (b)

Exocytosis Exocytosis (below) is an active transport process in which a secretory vesicle fuses with the plasma membrane and expels its contents into the extracellular space. In multicellular organisms, various types of cells (e.g. endocrine cells and nerve cells) are specialized to manufacture products, such as proteins, and then export them from the cell to elsewhere in the body or outside it. (DID YOU KNOW? The contents of the Exocytosis (and its counterpart endocytosis) require energy because they involve maverment of cytoskeletal proteins. vesicle are expelled into the extracellular space. Plasma membrane Vesicle fuses with the plasma membrane. Vesicle from the Golgi carrying molecules for export moves to the perimeter of the cell. From Golgi apparatus Nerve cell NT Golgi apparatus forming vesicles Nerve cell The transport of Golgi vesicles to the edge of the cell and their expulsion from the cell occurs through the activity of the cyloskeleton. This requires energy (ATP). Exocytosis is important in the transport of neurotransmitters into the junction (synapse) between nerve cels to transmit nervous signals. Fungi and bacteria use exocytosis to secrete digestive enzymes, which break down substances extracellularly so that nutrients can be absorbed (by endocytosis). 2. (a) What is the purpose of exocytosis? (b) How does it occur and what cellular components are involved? ? 3. Describe two examples of the purpose of exocytosis in cells: (a) (b)

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Exocytosis Exocytosis (below) is an active transport process in which a secretory vesicle fuses with the plasma membrane and expels its contents into the extracellular space. In multicellular organisms, various types of cells (e.g. endocrine cells and nerve cells) are specialized to manufacture products, such as proteins, and then export them from the cell to elsewhere in the body or outside it. (DID YOU KNOW? The contents of the Exocytosis (and its counterpart endocytosis) require energy because they involve maverment of cytoskeletal proteins. vesicle are expelled into the extracellular space. Plasma membrane Vesicle fuses with the plasma membrane. Vesicle from the Golgi carrying molecules for export moves to the perimeter of the cell. From Golgi apparatus Nerve cell NT Golgi apparatus forming vesicles Nerve cell The transport of Golgi vesicles to the edge of the cell and their expulsion from the cell occurs through the activity of the cyloskeleton. This requires energy (ATP). Exocytosis is important in the transport of neurotransmitters into the junction (synapse) between nerve cels to transmit nervous signals. Fungi and bacteria use exocytosis to secrete digestive enzymes, which break down substances extracellularly so that nutrients can be absorbed (by endocytosis). 2. (a) What is the purpose of exocytosis? (b) How does it occur and what cellular components are involved? ? 3. Describe two examples of the purpose of exocytosis in cells: (a) (b)
Transcribed Image Text:Exocytosis Exocytosis (below) is an active transport process in which a secretory vesicle fuses with the plasma membrane and expels its contents into the extracellular space. In multicellular organisms, various types of cells (e.g. endocrine cells and nerve cells) are specialized to manufacture products, such as proteins, and then export them from the cell to elsewhere in the body or outside it. (DID YOU KNOW? The contents of the Exocytosis (and its counterpart endocytosis) require energy because they involve maverment of cytoskeletal proteins. vesicle are expelled into the extracellular space. Plasma membrane Vesicle fuses with the plasma membrane. Vesicle from the Golgi carrying molecules for export moves to the perimeter of the cell. From Golgi apparatus Nerve cell NT Golgi apparatus forming vesicles Nerve cell The transport of Golgi vesicles to the edge of the cell and their expulsion from the cell occurs through the activity of the cyloskeleton. This requires energy (ATP). Exocytosis is important in the transport of neurotransmitters into the junction (synapse) between nerve cels to transmit nervous signals. Fungi and bacteria use exocytosis to secrete digestive enzymes, which break down substances extracellularly so that nutrients can be absorbed (by endocytosis). 2. (a) What is the purpose of exocytosis? (b) How does it occur and what cellular components are involved? ? 3. Describe two examples of the purpose of exocytosis in cells: (a) (b)
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