0
What else can I help you with?
Will a human being have the same set of cells that he or she is born with when he or she is old why or why not?
No, a human being will not have the same set of cells throughout their life. Cells in the body are constantly being replaced through processes like cell division, regeneration, and apoptosis (programmed cell death). While some cells, like neurons in the brain, can last a lifetime, most cells, such as those in the skin and blood, are regularly renewed. Consequently, the cellular composition of an individual's body changes over time.
Where do stem cells go after no longer needed?
After stem cells are no longer needed, they can undergo apoptosis, a programmed cell death process that ensures they do not persist in the body when their function is complete. Some stem cells may also differentiate into specialized cells and become part of various tissues, while others may remain in a quiescent state, ready to be activated if needed in the future. Additionally, in certain conditions, excess stem cells may be cleared by the immune system.
How do T cells destroy infected or diseased cells?
Cytotoxic T-cells kill infected cells in one of two ways: 1. By interaction with Fas ligand on T-cell with Fas molecule on target cell (induces apoptosis). 2. Release of lytic granules containing granzymes (also induces apoptosis) - For this, the T-cell needs to form pores in the target cell using perforin and granulysin.
What controls the way stem cells divide and differentiate?
Ultimately their genetics. However various genes get turned off at programmed times by methylation of the DNA while others get turned on at programmed times by demethylation of the DNA. The methylated/demethylated forms of the DNA are passed on to the stem cell's descendants so they "retain their programmed state" and thus their identity following differentiation. Some of this program control is influenced by the concentrations of various chemicals secreted by other cells in the vicinity of the stem cell or its descendants.
Where do t cells die?
T cells can die in different locations in the body. Some T cells die in the thymus during development if they fail to pass selection processes, while others can die in peripheral tissues during immune responses to pathogens or in lymphoid organs when their activity is no longer needed. Ultimately, the process of programmed cell death, known as apoptosis, is crucial for maintaining immune system balance.
What happened to the sponge cells?
Sponge cells, or choanocytes, are specialized cells that help in filter feeding by drawing water through the sponge's porous body. They capture food particles and facilitate gas exchange. Over time, as sponges evolve or respond to environmental changes, these cells may adapt or differentiate into other cell types, contributing to the sponge's overall growth and regeneration. In some cases, sponge cells can also undergo apoptosis or programmed cell death as part of their life cycle or in response to stress.
The process whereby cells reproduce themselves after becoming damaged diseased or worn out?
Damaged or diseased cell usually don't enter cell division anymore (some viruses can trigger cell division). By die from apoptose, followed by atrophy (natural programmed cell death). Fit cells can divide by mitosis. Or in the case of reproductive cells, meiosis.
How do pathogens destroy tissue?
Pathogens can destroy tissue through various mechanisms, including the release of toxins that directly damage cells, triggering inflammatory responses that lead to tissue injury, and inducing apoptosis (programmed cell death) in host cells. Some pathogens may also invade cells and replicate within them, causing cellular lysis and tissue necrosis. Additionally, immune responses aimed at eliminating the pathogens can inadvertently contribute to further tissue damage.
How do some molecules get into cells?
Some molecules get into cells by going through their permeable membrane.
How do you program a keyless remote for a 2001 Chevrolet venturer?
Check owner's manual some have to be programmed through radio others through door lock button
Do all replacement PCM's come programmed?
No, some are blank and need programmed by the dealer.
How do T cells destroy infected or diseased cells?
Cytotoxic T-cells kill infected cells in one of two ways: 1. By interaction with Fas ligand on T-cell with Fas molecule on target cell (induces apoptosis). 2. Release of lytic granules containing granzymes (also induces apoptosis) - For this, the T-cell needs to form pores in the target cell using perforin and granulysin.
What is cellular suicide called?
Apoptosis. It's regulated by each individual cell in most circumstances. It is also referred to as 'programmed cell death' in some texts.
How are humans programmed?
Humans are mainly programmed through pattern recognition and trial and error. Though they are also born with some programs such as bodily functions and how to operate their hardware (eyes, hands, ect.) though even that may take some time to learn correctly.
Are humans programmed to die?
In some ways yes, after a while, our bodies are programmed to stop producing hormones.
What controls the way stem cells divide and differentiate?
Ultimately their genetics. However various genes get turned off at programmed times by methylation of the DNA while others get turned on at programmed times by demethylation of the DNA. The methylated/demethylated forms of the DNA are passed on to the stem cell's descendants so they "retain their programmed state" and thus their identity following differentiation. Some of this program control is influenced by the concentrations of various chemicals secreted by other cells in the vicinity of the stem cell or its descendants.
Where do t cells die?
T cells can die in different locations in the body. Some T cells die in the thymus during development if they fail to pass selection processes, while others can die in peripheral tissues during immune responses to pathogens or in lymphoid organs when their activity is no longer needed. Ultimately, the process of programmed cell death, known as apoptosis, is crucial for maintaining immune system balance.
