Flashcards in Chapter 8.6 Deck (6)
Development depends on the balance of what 2 processes
a balance between cell division and programmed death( apoptosis)
The difference between appoptosis and necrosis
apoptosis : is programmed death resulting from precisely coordinated series of events that dismantle a cell.
Necrosis: sudden traumatic and disorderly accidental death of a cell.
2 main function of apoptosis in animals
1. elimates ecess cells ( carves out functional structures like finger, toes, nostrils and ears)
2. weed out defective aging or defective cells that might harm an organism ( peeling skin that follows a sunburn preventing skin cancer)
Apoptosis in plant cells
plant cells are digested by enzymes by their own vacuoles; when the vocuole bursts the cell dies. Plants also use a form of cell death to kill cells infected by fungi or bacteria, limiting the spread of pathogen.
. What events happen in a cell undergoing apoptosis?
A cell undergoing apoptosis first receives a signal at a membrane protein called a death receptor. The signal triggers the release of enzymes that destroy the cell from within. Eventually, immune system cells engulf the dying cell, degrading or recycling its components.