Study Notes

The Nerve Impulse When a nerve is stimulated the resting potential changes. Examples of such stimuli are pressure, electricity, chemicals, etc. Different neurons are sensitive to different stimuli(although most can register pain). The stimulus causes sodium ion channels to open. The rapid change in polarity that moves along the nerve fiber is called the "action potential." In order for an action potential to occur, it must reach threshold. If threshold …

Enzyme Kinetics Enzymes are protein catalysts that, like all catalysts, speed up the rate of a chemical reaction without being used up in the process. They achieve their effect by temporarily binding to the substrate and, in doing so, lowering the activation energy needed to convert it to a product. The rate at which an enzyme works is influenced by several factors, e.g., the concentration of substrate molecules (the more of them available, the quicker t…

Ibuprofen used to relieve the symptoms of arthritis, primary dysmenorrhoea, fever; and as an analgesic, especially where there is an inflammatory component. Indications rheumatoid arthritis, osteoarthritis, juvenile rheumatoid arthritis, primary dysmenorrhoea fever, relief of acute and/or chronic pain states in which there is an inflammatory component MOA inhibition of  cyclooxygenase (COX); thus inhibiting prostaglandin synthesis.…

Dental Solders Applications-bridges and orthodontic appliances Terms Soldering -joining operation using filler metal that melts below 500° C Brazing -joining operation using filler metal that melts above 500°C Welding-melting and alloying of pieces to be joined Fluxing  -Oxidative cleaning of area to be soldered  - Oxygen scavenging to prevent oxidation of alloy being soldered 16- 650 -- 650 fineness solder to be used with 16-k…

Cells, cytoplasm, and organelles: Cytoplasm consists of a gelatinous solution and contains microtubules (which serve as a cell's cytoskeleton) and organelles Cells also contain a nucleus within which is found DNA (deoxyribonucleic acid) in the form of chromosomes plus nucleoli (within which ribosomes are formed) Organelles include: Endoplasmic reticulum : 2 forms: smooth and rough; the surface of rough ER is coated with ribosomes; t…