CELS lecture 5

Microtubules

• Microtubules are composed of tubulin subunits, forming a straw-like structure.

• Their primary function is to resist compression, providing structural stability to the cell.

• Often serve as tracks for organelles, which are attached and can move along these structures using energy.

Structural Stability

• Microtubules contribute to the overall structural integrity of the cell.

• Found in dense networks, particularly beneath the cell membrane.

• The extracellular matrix surrounding the cells is generally softer and more pliable, allowing for interaction with the cell.

• Water molecules play a significant role in maintaining the structure, getting trapped between the protruding microtubules.

Importance of Water

• Water is essential for bodily functions, as it can be both produced and ingested.

• It's effective in resisting compression, which is critical for maintaining cell shape and function.

• Historical reference: In the 1970s, water beads were popular for their unique ability to disperse tension and allow for comfort, highlighting water's properties in providing resistance to compression.

Fibronectin

• Fibronectin is a key protein that aids in connecting different structures within and outside the cell.

• The term "fibronectin" breaks down into "fibro" meaning fibers, and "nectin" implying connection, underscoring its role in anchoring fibers.

• It helps anchor the cytoskeleton to cell membranes, integrating the cell's interior with its external environment.

Cell Integration

• Integral proteins play a crucial role in the anchoring process of the cytoskeleton to the extracellular matrix, facilitating communication and structural cohesion.

• These connections are essential for cellular signaling and maintaining the overall health and stability of the cell.