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There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

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Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.

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Drug-induced pharmacodynamic effects manifested in older adults include drug-induced renal toxicity, which can be a major factor when these adults are experiencing other kidney problems.

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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

The eukaryotic cell cycle and cell division in an organism with six chromosomes. The eukaryotic cell cycle and cell division in an organism with six chromosomes.
Eukaryotic cell structure Eukaryotic cell structure
cell signaling + Apoptosis cell signaling + Apoptosis
Conduction Velocities in Axons of Various Nerve Fiber Types Conduction Velocities in Axons of Various Nerve Fiber Types
Testing motor function of cranial nerve VII - Smile Testing motor function of cranial nerve VII - Smile
Modern Cell Theory Modern Cell Theory
Video: Miller's reaction chamber experiment Animation

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