Membrane potential is classified as: 1. Resting Membrane Potential 2. Action Potential 3. Graded Potential. All cells in animal body tissue are electrically polarized, in other words they maintain a voltage difference across the plasma membrane known as membrane potential. The cell membrane acts as a barrier that prevents intracellular fluid from mixing with the extracellular fluid. Therefore, the electrical [...]
Transport across cell membrane is classified into four ways: 1. Diffusion (Passive Transport) 2. Osmosis 3. Active Transport 4. Vesicular Transport. Cell membrane acts as a barrier to most, but not all molecules. Cell membranes are semi-permeable barrier separating the inner cellular environment from the outer cellular environment. Since the cell membrane is made up of a lipid bilayer with [...]
In this article we will discuss about:- 1. Meaning of Cell Membrane 2. Appearance of Cell Membrane 3. Composition 4. Passive Diffusion or Transport across Cell Membrane. Meaning of Cell Membrane: The term was originally used by Nageli and Cramer (1855) for the membranous covering of the protoplast. The same was named plasma lemma by Plowe (1931). Plasma lemma or [...]