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Afterhyperpolarization, or AHP, is the hyperpolarizing phase of a neuron's action potential where the cell's membrane potential falls below the normal resting potential. This is also commonly referred to as an action potential's undershoot phase. AHPs have been segregated into "fast", "medium", and "slow" components that appear to have distinct ...
An action potential occurs when the membrane potential of a specific cell rapidly rises and falls. [1] This depolarization then causes adjacent locations to similarly depolarize. Action potentials occur in several types of excitable cells, which include animal cells like neurons and muscle cells, as well as some plant cells.
Prednisone is a glucocorticoid medication mostly used to suppress the immune system and decrease inflammation in conditions such as asthma, COPD, and rheumatologic diseases. [3] It is also used to treat high blood calcium due to cancer and adrenal insufficiency along with other steroids . [ 3 ]
Tachyphylaxis: The acute development of tolerance to the action of a drug after repeated doses. [15] Significant tachyphylaxis can occur by day 4 of therapy. Recovery usually occurs after 3 to 4 days' rest. This has led to therapies such as 3 days on, 4 days off; or one week on therapy, and one week off therapy. Delivery-related adverse effects
The medications included prednisone, and methylprednisolone, plus albuterol, beclomethasone, dexamethasone, cromolyn, salmeterol and clarithromycin. Within days of beginning the glucocorticoid treatment, however, the patient began to show symptoms that included major depression, irritability, muscle weakness, and hallucinations ("stars" or ...
When the motor nerve is stimulated there is a delay of only 0.5 to 0.8 msec between the arrival of the nerve impulse in the motor nerve terminals and the first response of the endplate [7] The arrival of the motor nerve action potential at the presynaptic neuron terminal opens voltage-dependent calcium channels, and Ca 2+ ions flow from the ...
The name mineralocorticoid derives from early observations that these hormones were involved in the retention of sodium, a mineral.The primary endogenous mineralocorticoid is aldosterone, although a number of other endogenous hormones (including progesterone [1] and deoxycorticosterone) have mineralocorticoid function.
Prednisolone is a synthetic pregnane corticosteroid closely related to its cognate prednisone, having identical structure save for two fewer hydrogens near C 11. It is also known as δ 1 -cortisol , δ 1 -hydrocortisone , 1,2-dehydrocortisol , or 1,2-dehydrohydrocortisone , as well as 11β,17α,21-trihydroxypregna-1,4-diene-3,20-dione .