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The Cell Theory Development and History

Cytology, the clinical study of cells, was born in 1665 when Robert Hooke observed the empty cell walls of cork and created the word cellulae (” little cells”) to explain them. Soon he studied thin pieces of fresh wood and saw living cells “filled with juices”– a

Factors Affecting Net Rate of Diffusion

The diffusion of the substance can happen in any case, i.e. extracellular fluid (ECF) to intracellular fluid (ICF) or vice versa relying on the dominating environment The elements which impact the net rate of diffusion in the wanted direction are: Cell membrane permeability. Permeability of the cell

Epithelial Tissues – Simple And Stratified: Functions, Locations And Difference

Epithelial tissues, or epithelia (singular, epithelium), may be composed of one or more layers of cells. The number of cell layers and the shape of the cells provide the basis for classifying epithelial tissues. Epithelial tissues are distinguished by the following five characteristics: Epithelial cells are packed

Cranium – What Bones Form The Cranium?

The cranium is formed of one frontal bone, two parietal bones, one sphenoid, two temporal bones, one occipital bone, and one ethmoid. The frontal bone forms the anterior part of the cranium, including the superior portion of the orbits (eye sockets), the forehead, and the roof of

Ventricles And Cerebrospinal Fluid

There are four interconnecting ventricles, or cavities, within the brain. Each ventricle is lined by ependymal cells and is filled with cerebrospinal fluid (CSF). The largest ventricles are the two lateral ventricles (first and second ventricles), which are located within the cerebral hemispheres. The ihird ventricle is

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