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It is caused by an irreversible functional imbalance and collapse of the internal organization of a system. The role of cell death is the maintenance of tissue and organ homeostasis, for example, the regular loss of skin cells or a more active role seen in involuting tissues like the thymus. Cells die either by accident or design.
Overview of signal transduction pathways involved in apoptosis. Cell death is the event of a biological cell ceasing to carry out its functions. This may be the result of the natural process of old cells dying and being replaced by new ones, as in programmed cell death, or may result from factors such as diseases, localized injury, or the death of the organism of which the cells are part.
This glossary of biology terms is a list of definitions of fundamental terms and concepts used in biology, the study of life and of living organisms.It is intended as introductory material for novices; for more specific and technical definitions from sub-disciplines and related fields, see Glossary of cell biology, Glossary of genetics, Glossary of evolutionary biology, Glossary of ecology ...
A mortal sin (Latin: peccātum mortāle), in Christian theology, is a gravely sinful act which can lead to damnation if a person does not repent of the sin before death. It is alternatively called deadly, grave, and serious; the concept of mortal sin is found in both Catholicism and Lutheranism .
The definition of legal death, and its formal documentation in a death certificate, vary according to the jurisdiction. The certification applies to somatic death , corresponding to death of the person, which has varying definitions but most commonly describes a lack of vital signs and brain function. [ 9 ]
Within the field of developmental biology, one goal is to understand how a particular cell develops into a final cell type, known as fate determination. Within an embryo, several processes play out at the cellular and tissue level to create an organism.
In biology, autolysis, more commonly known as self-digestion, refers to the destruction of a cell through the action of its own enzymes. It may also refer to the digestion of an enzyme by another molecule of the same enzyme. The term derives from the Greek αὐτο- 'self' and λύσις 'splitting'.
A proximate occasion of sin can be in se or per accidens. There is a debate between laxists and rigorists as to whether an occasion of sin is one which leads to sin systematically, occasionally or even just potentially. [17] Thus, Catholic bishop Jean-Joseph Gaume argued that there is a proximate occasion of sin in "every occasion that leads to ...