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Mechanizm regulacji pobierania pokarmu u psów. Cz. 1 - Vetkompleksowo – serwis dla lekarzy weterynarii
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Wyszukaj w serwisie


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Mechanizm regulacji pobierania pokarmu u psów. Cz. 1. Czynniki wewnętrzne regulacji pobierania pokarmu


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Mechanizm regulacji pobierania pokarmu

Na spożywanie pokarmu wpływa szereg czynników zarówno zewnętrznych, tj.: smakowitość, wygląd i zapach, oraz wewnętrznych, tj. stan odżywienia i wymagania energetyczne (18). Sygnały powstające na obwodzie ciała, docierające i informujące ośrodkowy układ nerwowy, można podzielić na dwie grupy. Pierwsze to sygnały krótkoterminowe, zwane sygnałami sytości. Informują o stanie wypełnienia przewodu pokarmowego i hamują dalszy pobór pokarmu. Druga grupa, sygnałów długotrwałych, przekazuje informacje o gospodarce energetycznej i jej zasobach (16). Jest to realizowane za pośrednictwem układu nerwowego i hormonalnego (3).

Mechanizm regulacji pobierania pokarmu
Tab. 1. Hormonalne czynniki regulujące apetyt (20)

Interakcja sygnałów dochodzących z organizmu ma miejsce w jądrze łukowatym podwzgórza (ARC). W jego obrębie znajdują się dwie grupy neuronów działających antagonistycznie. Układ oreksygeniczny ma wpływ na stymulację pobierania pokarmu za pomocą neuropeptydu Y (NPY) i białka agoutipodobnego (AgRP). Natomiast układ anoreksygeniczny działa za pośrednictwem propiomelanokortyny (POMC) i peptydów indukowanych przez amfetaminę oraz kokainę (CART). Jego aktywność hamuje łaknienie oraz zwiększa zużycie energii przy jej nadmiarze (16, 23).

Ośrodek głodu i sytości

Za kierowanie i regulację pobierania pokarmu są odpowiedzialne mechanizmy zlokalizowane w podwzgórzu. Dzielą się na dwie główne części, z czego pierwsza, nazwana „ośrodkiem głodu”, leży w jądrze pola podwzgórzowego bocznego (LHA). Stymulacja znajdujących się tu populacji neuronów [...]

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Mogą zainteresować Cię również


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Wizytówka firmy


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Sklep


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