reach the bloodstream rapidly and the blood sugar level rises rapidly. The pancreas must secrete large quantities of insulin in order to lower the blood sugar level, which then sinks to such low levels that it evokes a strong sensation of hunger with fatigue. With renewed sugar intake, the level rapidly rises again. A diet rich in sugar entails strong swings in blood sugar level, with consequent variability in performance. Moreover, simple sugars have practically no nutritional value, they are “empty calories.” Whole-grain products (starch + vitamins + fiber; see Fiber below) are more filling in the long run and avoid blood sugar peaks. Metabolism, Energy Requirements and Nutrients Bundan tashqari. tonusni idora etish qobiliyati ham bir qadar saqlanadi. Yonboshlatib qo’yilgan bunday it o’zicha oprnidan turadi. Agar boshining vaziyati o’zgartirilsa, u boshini gorizontal holda tutishga intiladi. Binobarin, o’rta miya tonusni idora etadi va uni tegishlicha taqsimlaydi. Bu, uygpun harakatlar qilish uchun zarur shartdir.
Muskullar tonusiga taalluqli reflekslarning yoylari quloqdagi vestibulyar apparatida. shuningdek muskullarda boshlanib. u yerdan impulslar markazga intiluvchi tolalar orqali uzunchoq miyaga boradi. Yuqorida ko’rsatilgan yopl orqali kelgan qo’zg’alish uzunchoq miya bilan orqa miyaga o’tib , muskullar tonusini o’zgartiradi.
Sezuvchi nerv yadrolariga kelganda, ularning faoliyati kopruv va eshituv funksiyalari bilan bog’langandir. Bosh miyasi o’rta miya yuqorisidan olib tashlangan hayvon yorugplik va tovushni sezadi. Agar shunday hayvonga ravshan yorugplik tushirilsa, u yorugp tushgan tomonga boshini buradi, Unda qorachiq refleksi ham saqlanib qoladi. Bunday hayvon tovush chiqqan tomonga ham boshini buradi. Bu reflekslar oriyentirovka (chamalash) reaksiyalaridan iboratdir.
