Eukaryotic Animal Cell
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Ribosomes: Ribosomes are packets of RNA and protein that play a crucial role inboth prokaryotic and eukaryotic cells. They are the site of protein synthesis. Eachribosome comprises two parts, a large subunit and a small subunit. MessengerRNA from the cell nucleus is moved systematically along the ribosome wheretransfer RNA adds individual amino acid molecules to the lengthening proteinchain.







Secretory Vesicle: Cell secretions e.g. hormones,neurotransmitters are packaged in secretory vesicles at theGolgi apparatus. The secretory vesicles are then transportedto the cell surface for release.

Actin filaments (microfilaments): Microfilaments are fine, thread-like proteinfibers, 3-6 nm in diameter. They are composed predominantly of a contractileprotein called actin, which is the most abundant cellular protein. Microfilaments'association with the protein myosin is responsible for muscle contraction.Microfilaments can also carry out cellular movements including gliding,contraction, and cytokinesis.
Microtubules: Microtubules are cylindrical tubes, 20-25 nm in diameter. They are composedof subunits of the protein tubulin--these subunits are termed alpha and beta. Microtubulesact as a scaffold to determine cell shape, and provide a set of "tracks" for cell organellesand vesicles to move on. Microtubules also form the spindle fibers for separatingchromosomes during mitosis. When arranged in geometric patterns inside flagella and cilia,they are used for locomotion.
Intermediate Filaments: Intermediate filaments are about 10 nm diameter and provide tensile strength for the cell.

Centrioles: Each centriole is a ring of nine groups of fused microtubules.There are three microtubules in each group. Microtubules (andcentrioles) are part of the cytoskeleton. In the complete animal cellcentrosome, the two centrioles are arranged such that one isperpendicular to the other.

Cytoplasm:This is a collective term for thecytosol plus the organelles suspended withinthe cytosol.

Nucleolus: The prominent structure in the nucleus is thenucleolus. The nucleolus produces ribosomes, which moveout of the nucleus and take positions on the roughendoplasmic reticulum where they are critical in proteinsynthesis.