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B. Simple columnar epithelium
SCE is in all skin, lung, and blood vessel walls.
Cells respond to environmental effects through signal transduction, which promotes healthy cell growth and normal cell function.
<h3>Why is the signal transduction step necessary?</h3>
The reason why after a signal binds to a signal receptor, we need the next step is as follows:
- For the purpose of triggering an appropriate cellular response, living creatures have evolved a vast range of intricate procedures to send signals from the outside to the inside.
- These molecular pathways can develop flaws that result in a variety of ailments, including diabetes, cancer, and psychotic conditions.
- It is the mechanism by which a cell responds to the stimuli it receives from the environment by diffusion of those signals to its internal compartments.
- Signal transduction is the process by which a cell translates a given signal or external stimulus into another signal or specific response.
- First, a particular receptor on the cell's membrane or cytoplasm must be activated by a signaling molecule (also known as a ligand). transduction.
- Ligand-receptor binding is extremely specific; it can be compared to a lock and key.
- Second messengers are chemicals that enable intracellular signal amplification after a signal has been received.
- A ligand's interaction to a receptor may result in the production of hundreds of second messenger molecules, which may then change thousands of effector molecules to cause a variety of reactions.
- Signal transduction enables cells to perceive, interpret, and react to various environmental signals, enabling them to carry out their usual functions.
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Answer:
The answer to the question: The movement of ions through their channels require a discharge of the capacitance, is, true.
Explanation:
In order for cells, muscular and neuronal, to perform their activities, they need to generate action potentials, that will permit these activities. In order for an action potential to happen, a cell´s membrance must be charged, or rather, its polarity must be changed, so that the cell can be charged and then fire. Usually, cells remain in a resting membrane state, in which, the extracellular matrix remains positive, while the intracellular space remains positive, due to ion, and anion presence in either. In order for the action potential to happen, these polarities are reversed through a series of steps in which ions, particularly potassium and sodium, sometimes calcium, will enter and exit the cell´s membrane to change this polarity. But in order for this process to take place, first a current, or stimulation, must motivate the cell to start the process. The capacitance is the capability of a cell to be ready to be activated or de-activated when stimulated, meaning, to be charged and discharged, when necessary. In order for this capacitance to permit the process of action potential formation, it needs to be discharged first, and this is done through the stimulus, which orders the cell´s membrane to initiate depolarization by opening up the ion channels. This is why the answer is true.
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