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CarbonRobot CarbonRobot
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Posts: 393
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A year ago
How is tissue that can't proliferate kept healthy? If those cells die is it pretty much like permanent teeth falling out?
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wrote...
Valued Member
Educator
A year ago
Hi CarbonRobot

You mean in vitro, like cells being stored on a Petri dish or a live subject? Or perhaps you're using the wrong verb, "proliferate", when instead you meant "survive".
CarbonRobot Author
wrote...
A year ago
Hi CarbonRobot You mean in vitro, like cells being stored on a Petri dish or a live subject? Or perhaps you're using the wrong verb, "proliferate", when instead you meant "survive".

I mean in a living person. I mean cells in organs like the heart that don't divide or resupply for any that die over time?
wrote...
Valued Member
Educator
A year ago
These "lifetime" cells usually have a constant supply of nutrients that prevents them from having to undergo mitosis. For example, the moment a person has a heart attack, the flow of nutrients (e.g. oxygen) is disrupted, causing immediate, irreparable damage. Another example of "lifetime" cells are neurons; that is, adult nerve cells are expected to survive for a lifetime. Prior to reaching their adult stage, many developing neurons are destined to die by apoptosis unless they are "rescued" by their exposure to growth factors that shut off the cell suicide program, enabling their survival. Naturally too many neurons are generated, forcing them to compete for a limited supply of critical growth factors. [1] On a similar note, neurons are supported by glial cells, which are non-neuronal cells in the nervous system, provide support to neurons in various ways. For example, they help to regulate the chemical environment around neurons and provide them with nutrients. Cells that last a lifetime, such as neurons, have mechanisms to repair and regenerate their own structures. For example, they can synthesize new proteins and replace damaged or worn-out components.
CarbonRobot Author
wrote...
A year ago
If a person does have a stroke or heart attack or even had PVCs they might need part of their heart burned away since it can't be fixed. What then? How can any healing be possible?
wrote...
Valued Member
Educator
A year ago
People who've had heart attacks sometimes have no other choice but to get coronary artery bypass surgery. This creates a new path for blood to flow around a blocked or partially blocked artery in the heart. When a cerebral infarction occurs as a result of a stroke, the brain slowly undergoes a process of reorganization and repair, known as neuroplasticity.
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