Cell Lesson Part 1

Cell Lesson

Today We will learn about the Cell.

Objectives

• Be Able To Name Different Parts Of The Cell

• To Be Able To Make A 100 On The Quiz

The Nucleus

In cell biology, the nucleus is a membrane-bound organelle found in eukaryotic cells. Eukaryotes usually have a single nucleus, but a few cell types, such as mammalian red blood cells, have no nuclei, and a few others including osteoclasts have many. The main structures making up the nucleus are the nuclear envelope, a double membrane that encloses the entire organelle and isolates its contents from the cellular cytoplasm; and the nuclear matrix, a network within the nucleus that adds mechanical support, much like the cytoskeleton supports the cell as a whole.

The Nucleus

• Is Only In Eukaryotic Cells

• Is The Main Part Of The Cell

The Mitochondria

The mitochondrion is a double membrane-bound organelle found in most eukaryotic organisms. Some cells in some multicellular organisms lack mitochondria (for example, mature mammalian red blood cells). A number of unicellular organisms, such as microsporidia, parabasalids, and diplomonads, have reduced or transformed their mitochondria into other structures. To date, only one eukaryote, Monocercomonoides, is known to have completely lost its mitochondria, and one multicellular organism, Henneguya salminicola, is known to have retained mitochondrion-related organelles in association with a complete loss of their mitochondrial genome.

The Mitochondria

• Signaling through mitochondrial reactive oxygen species

• Is The Powerhouse Of The Cell

• Regulation of the membrane potential

• Apoptosis -programmed cell death

• Calcium signaling (including calcium-evoked apoptosis)

• Regulation of cellular metabolism