Health and Medical Care Tips
Apoptosis programmed cell death that is carried out in multicellular organism. Apoptosis leads to production of cell fragments called apoptotic bodies that phagocytic cells engulf and quickly remove.
Apoptosis is designed to carry out functions of the body development.For example, the differentiation of fingers and toes in a developing human embryo occurs because cells between the fingers apoptose, separating the digits.
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Chemotaxis is the phenomenon in which somatic cells, bacteria, and other single-cell or multicellular organisms direct their movements according to certain chemicals in their environment.
In bacteria, chemotaxis is important for finding food by moving towards the highest concentration of food molecules, or to move away from dangers.
In multicellular organisms, chemotaxis is critical for development and function.
Positive chemotaxis occurs if the movement is toward a higher concentration of the chemical in question.
Negative chemotaxis occurs if the movement is in the opposite direction.
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