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Cell nucleus
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The nucleus is the largest and most visible organelle in a cell. An organelle is one of the parts inside a cell that has a job of its own, and the nucleus is the one that stands out most under the microscope.
It is called the control center because it holds all the genetic instructions for making proteins. But not every cell has exactly one nucleus. Some, like muscle cells, have more than one, which is why they are called multinucleated. And mammalian red blood cells have none at all: they push their nucleus out as they mature to make room for hemoglobin molecules, the ones that carry oxygen through the body. It is a clear trade: they give up their genetic instructions so they can carry more oxygen.
In brief
The nucleus is the largest and most prominent of a cell's organelles.
It is considered the cell's control center because it stores all the genetic instructions for making proteins.
Not every cell follows the same rule: some, such as muscle cells, have more than one nucleus and are called multinucleated, while mammalian red blood cells have none, because they expel theirs as they mature to make room for the hemoglobin molecules that carry oxygen.
Sources (1)
- OpenStax, Rice UniversityAnatomy and Physiology 2e, 3.3 The Nucleus and DNA Replication
This page explains the topic in general terms; it does not tell anyone what treatment to follow.
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