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Physiology
The macula densa cells respond to decreases in sodium chloride concentration in the tubular fluid by releasing renin, which initiates the renin-angiotensin-aldosterone system (RAAS). This leads to increased sodium reabsorption and water retention,
Physiology
Troponin is a protein complex found in cardiac and smooth muscles, not in skeletal muscles. In skeletal muscles, it is the regulatory proteins tropomyosin and the troponin complex that are crucial for excitation-contraction coupling.
Pharmacology
Acute intermittent prophyria (AIP) : Barbiturates exacerbate it by inducing microsomal enzymes and d amino levulinic acid synthetase and increasing prophyrin synthesis.
Note: Contraindications of barbiturates : · Liver and kidney