Concept explainers
To determine: The list, similarities, and differences between various types of cell junctions and their subtypes.
Introduction: The connections formed between cells during their period of growth and development is known as cell junction. These junctions can be temporary or permanent. Various proteins are used in the formation of cell junctions, and such protein molecules are called cell adhesion molecules (CAMs).
To determine: An example of location of every type of cell junction and its function in the body.
Introduction: Cell junctions are also termed as intercellular bridge. These are found in multicellular organisms made up of protein complexes. They are present in large quantity in epithelial cells.
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Human Physiology: An Integrated Approach (8th Edition)
- Name four types of cell-to-cell junctions, and describe the function of each. Which are found in plants and which in animals?arrow_forwardWhich type(s) of cell junctions contain actin filaments? Which contain(s)intermediate filaments? Which contain(s) integrins? Which contain(s) cadherins?arrow_forwardThe trans epithelial electrical resistance (TEER) is a characteristic property of an epithelium. Which of the following statements best describes the TEER? a.) A high trans epithelial electrical resistance (TEER) is an indicator of a leaky epithelium in which paracellular diffusion of solute is likely to be high b.) A high trans epithelial electrical resistance (TEER) is an indicator of a tight attachment between the epithelium and the basement membrane in which diffusion of solute across the basolateral surface is likely to be low c.) A high trans epithelial electrical resistance (TEER) is an indicator of a tight epithelium in which paracellular diffusion of solute is likely to be lowarrow_forward
- Which are the Three types of specialized membrane junctions?arrow_forwardIdentify the nonpolar, inorganic molecule which can pass freely through the plasma membrane. CH3CH2OH (ethanol) CO2 (carbon dioxide) C12H22O11 (sucrose) C6H12O6 (glucose) C6H6 (benzene)arrow_forwardExplain how tight junctions maintain membrane domains in the epithelial layers . can tight junctions establish the membrane domain or simply maintain it ?arrow_forward
- Briefly summarize the study and the defects of cell junctions or the extracellular matrix that leads to symptoms, a condition or disease. Make sure to describe what the actual defect is at the cellular or molecular level as far as it is known and what the consequences are for patients. add referencearrow_forwardWhich type(s) of cell junction prevent(s) substances from moving through the space between cells? Which type(s) of cell junction attach(es) cells to one another?arrow_forwardWhich of the following statements describes the function of plasma membranes? I. define boundaries of the cell and its organelles and act as permeability barriers II. sites for specific biological and chemical functions III. possess transport proteins that regulate the movement of substances into and out of the cell and its organelles IV. contain protein molecules that act as receptors to detect external signals V. provide mechanisms for cell-to-cell contact, adhesion, and communicationarrow_forward
- Identify how each of the following would pass through the plasma membrane: gases, large polar molecules, charged molecules (like ions), hydrophobic molecules, and small polar molecules. Be specific.arrow_forwardAnalogs of hemidesmosomes are the focal contact sites, which are also sites where the cell attaches to the extracellular matrix. These junctions are prevalent in fibroblasts but largely absent in epithelial cells. on the other hand, hemidesmosomes are prevalent in epithelial cells but absent in fibroblasts. In focal contact sites, intracellular connections are made to actin filaments, whereas in hemidesmosomes connections are made to intermediate filaments. Why do you suppose these two different cell types attach differently to the extracellular matrix?arrow_forward*For B, look closely/carefully at the molecule being transported. For each label/letter on the diagram above, identify the specific type of cell transport and give an example of a substance/molecule that uses that mode of transport to enter/exit the cell.arrow_forward
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