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While endocytosis and exocytosis refer to the direction in which a vesicle moves into and out of a cell respectively, it is important to think about what is being moved with and within the vesicles. To demonstrate how this process is utilized in human cells we will focus on the human body's insulin response. The purpose of the insulin response is to create a pathway for glucose entry into cells by releasing glucose transporters into the membrane. Cell Type #1- insulin producers: In humans, pancreatic B-cells create steroid insulin that can be packaged into vesicles starting at the ER. These vesicles are prepared for exocytosis so that the insulin can be released from the pancreatic B- cells and get into the bloodstream when signaled to do so. When glucose is present in the blood stream these cells will release the pre-packed insulin into the blood stream. Cell Type #2- insulin responders: Other cells do not produce insulin but instead respond when they have received the insulin signal from the blood stream. To prepare to respond to insulin, responder cells have also made pre-packaged vesicles that have been filled with transmembrane glucose transporter proteins. This way when a responder cell receives the insulin signal they will release their vesicles of glucose transporters (put the glucose doorway into the plasma membrane) to allow a doorway for glucose to come into the cell. When the cell is done responding it will grab the glucose transporters from the plasma membrane and bring them back into the cell in the vesicle. Using the information above about insulin production and how other cells respond, answer the questions on the worksheet.

While endocytosis and exocytosis refer to the direction in which a vesicle moves into and out of a cell respectively, it is important to think about what is being moved with and within the vesicles. To demonstrate how this process is utilized in human cells we will focus on the human body's insulin response. The purpose of the insulin response is to create a pathway for glucose entry into cells by releasing glucose transporters into the membrane. Cell Type #1- insulin producers: In humans, pancreatic B-cells create steroid insulin that can be packaged into vesicles starting at the ER. These vesicles are prepared for exocytosis so that the insulin can be released from the pancreatic B- cells and get into the bloodstream when signaled to do so. When glucose is present in the blood stream these cells will release the pre-packed insulin into the blood stream. Cell Type #2- insulin responders: Other cells do not produce insulin but instead respond when they have received the insulin signal from the blood stream. To prepare to respond to insulin, responder cells have also made pre-packaged vesicles that have been filled with transmembrane glucose transporter proteins. This way when a responder cell receives the insulin signal they will release their vesicles of glucose transporters (put the glucose doorway into the plasma membrane) to allow a doorway for glucose to come into the cell. When the cell is done responding it will grab the glucose transporters from the plasma membrane and bring them back into the cell in the vesicle. Using the information above about insulin production and how other cells respond, answer the questions on the worksheet.

Human Physiology: From Cells to Systems (MindTap Course List)
Human Physiology: From Cells to Systems (MindTap Course List)
9th Edition
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Lauralee Sherwood
Chapter2: Cell Physiology
Section: Chapter Questions
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While endocytosis and exocytosis refer to the direction in which a vesicle moves into and out of a cell respectively, it is important to think about what is being moved with and within the vesicles. To demonstrate how this process is utilized in human cells we will focus on the human body's insulin response. The purpose of the insulin response is to create a pathway for glucose entry into cells by releasing glucose transporters into the membrane. Cell Type #1- insulin producers: In humans, pancreatic B-cells create steroid insulin that can be packaged into vesicles starting at the ER. These vesicles are prepared for exocytosis so that the insulin can be released from the pancreatic B - cells and get into the bloodstream when signaled to do so. When glucose is present in the blood stream these cells will release the pre-packed insulin into the blood stream. Cell Type #2- insulin responders: Other cells do not produce insulin but instead respond when they have received the insulin signal from the blood stream. To prepare to respond to insulin, responder cells have also made pre-packaged vesicles that have been filled with transmembrane glucose transporter proteins. This way when a responder cell receives the insulin signal they will release their vesicles of glucose transporters (put the glucose doorway into the plasma membrane) to allow a doorway for glucose to come into the cell. When the cell is done responding it will grab the glucose transporters from the plasma membrane and bring them back into the cell in the vesicle. Using the information above about insulin production and how other cells respond, answer the questions on the worksheet.
Transcribed Image Text:While endocytosis and exocytosis refer to the direction in which a vesicle moves into and out of a cell respectively, it is important to think about what is being moved with and within the vesicles. To demonstrate how this process is utilized in human cells we will focus on the human body's insulin response. The purpose of the insulin response is to create a pathway for glucose entry into cells by releasing glucose transporters into the membrane. Cell Type #1- insulin producers: In humans, pancreatic B-cells create steroid insulin that can be packaged into vesicles starting at the ER. These vesicles are prepared for exocytosis so that the insulin can be released from the pancreatic B - cells and get into the bloodstream when signaled to do so. When glucose is present in the blood stream these cells will release the pre-packed insulin into the blood stream. Cell Type #2- insulin responders: Other cells do not produce insulin but instead respond when they have received the insulin signal from the blood stream. To prepare to respond to insulin, responder cells have also made pre-packaged vesicles that have been filled with transmembrane glucose transporter proteins. This way when a responder cell receives the insulin signal they will release their vesicles of glucose transporters (put the glucose doorway into the plasma membrane) to allow a doorway for glucose to come into the cell. When the cell is done responding it will grab the glucose transporters from the plasma membrane and bring them back into the cell in the vesicle. Using the information above about insulin production and how other cells respond, answer the questions on the worksheet.
1) Draw and label A) a membrane vesicle in Cell Type #2 that is filled with glucose transporters (drawn as triangles) and B) a membrane vesicle in cell type #1 that is filled with insulin (marked as ovals) B
Transcribed Image Text:1) Draw and label A) a membrane vesicle in Cell Type #2 that is filled with glucose transporters (drawn as triangles) and B) a membrane vesicle in cell type #1 that is filled with insulin (marked as ovals) B
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