Cells and specialized work & Membrane, cytoplasm, and cytoskeleton

Cells and specialized work

Cells are the basic building blocks of living organisms. Trillions make up the human body, supplying structure, using nutrients, converting energy, and performing specialized tasks. They contain hereditary material and can make copies of themselves. Organelles are structures with particular functions. Internal organization coordinates processes instead of everything occurring in one undifferentiated space; a cell’s microscopic arrangement is therefore related to the work it performs in the body.

Membrane, cytoplasm, and cytoskeleton

The membrane separates a cell from its surroundings and allows material to move in and out. Cytoplasm includes cytosol, a gel-like fluid, and structures around the nucleus. The cytoskeleton contains fibers supporting shape, movement, and division and providing routes for internal transport. Boundary control and internal support are distinct jobs. These structures help organize a cell physically while its other components handle energy, information, and molecular processing.

Key concepts

Cells and specialized work

Cells are the basic building blocks of living organisms.

Membrane, cytoplasm, and cytoskeleton

The membrane separates a cell from its surroundings and allows material to move in and out.

DNA storage and protein production

The nucleus houses DNA and directs growth, maturation, division, and cell death.

Energy, packaging, and recycling

Mitochondria convert food energy into a usable form and have genetic material separate from nuclear DNA.

References

• MedlinePlus en español — Cells, Organelles, and DNA