Terminology_Body Region

1. What is apoptosis as compared to necrosis?

Apoptosis, or programmed cell death, is a term originally used to describe cells that die at a predictable time and places during development.  Cellular interactions regulate apoptosis in two fundamentally different ways. Most cells require signals such as trophic factors to stay alive and will undergo apoptosis in the absence of these signals. However, some cells are triggered to undergo apoptosis by specific “death” signals.

Terms of relationship are not absolute. They are called terms of relationship because they describe how parts of the body are located in space relative to other body parts. Median may be considered an absolute term, as it means in the midline. Other terms, however, describe how a body part lies in relation to another part. Perhaps the soles of the feet could be described as absolutely inferior to everything else in the body, but they are still inferior relative to the rest of the body. Thus, these terms are not used as absolutes.

The lowest part of the auricle; it consists of fat and fibrous tissue not reinforced by the auricular cartilage

Synonym: lobulus auriculae, lobule of auricle.

The answer is yes. An agent is considered to be foreign if it is found outside of its normal environment. For example, if a bacterium (PL =bacteria), Pseudomonas aeruginosa is found within the blood of a human (i.e., host), it may be considered a foreign body or agent.

In an immunological viewpoint, an antigen is a foreign substance, or agent, this induces an immune response in the host. An antigen may or

I saw a couple of questions here. Let me first start by defining homology and analogy from an evolutionary perspective.