Identify the types of cell junctions that help to stop the leakage of the substances across a tissue and facilitation of communication with neighbouring cells via rapid transfer of ions and molecules.
- Gap junctions and Adhering junctions, respectively.
- Tight junctions and Gap junctions, respectively.
- Adhering junctions and Tight junctions, respectively.
- Adhering junctions and Gap junctions, respectively.
The Correct Option is B
Solution and Explanation
To answer this question, we need to understand the functions of different types of cell junctions in tissues:
- Tight Junctions: These junctions are composed of network proteins that create a seal between adjacent cells, preventing the leakage of substances through the space between cells. Therefore, tight junctions are essential in maintaining the distinct compositions of body compartments by controlling paracellular transport.
- Gap Junctions: These are specialized intercellular connections that directly connect the cytoplasm of two cells, which allows ions and molecules to pass freely between cells. They play a critical role in cell communication by facilitating the rapid transfer of signals. This is particularly important for the function of tissues where synchronized activity is necessary, such as in cardiac and smooth muscles.
Given this information, we can now evaluate the options provided:
- Gap junctions and Adhering junctions, respectively: This option is incorrect because while gap junctions do facilitate communication between cells, adhering junctions do not primarily stop the leakage of substances across tissues.
- Tight junctions and Gap junctions, respectively: This is the correct answer. Tight junctions prevent the leakage of substances across tissues, and gap junctions facilitate communication between cells.
- Adhering junctions and Tight junctions, respectively: This option is incorrect because adhering junctions play a role in anchoring cells rather than preventing leakage, whereas tight junctions are not involved in rapid communication between cells.
- Adhering junctions and Gap junctions, respectively: This is incorrect for the same reasons mentioned above, as adhering junctions do not prevent the leakage of substances.
Thus, the correct answer is: Tight junctions and Gap junctions, respectively.
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Concepts Used:
Animal Tissues
Human bodies, like most animal bodies, are made up of four different types of tissue:
Epithelial Tissue:
This tissue forms the outer layer of the body and also lines many of the body's cavities where it has a protective function.
General functions of epithelial tissue:-
- Provides a barrier between the external environment and the organ that it is covering.
- Specialized to function in secretion and absorption.
- Protects organisms from microorganisms, injury, and fluid loss.
Connective Tissue:
This tissue assists in the support and protection of organs and limbs and depending on the location in the body it may join or separate organs or parts of the body.
Muscle Tissue:
This tissue enables various forms of movement, both voluntary and involuntary.
Nerve Tissue:
This tissue is responsible for the carrying of electrical and chemical signals and impulses from the brain and central nervous system to the periphery, and vice versa.