Which substance is produced by endocrine glands:
A. saliva
B. milk
C. stomach acid and digestive enzymes
D. insulin
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Which kind of hormones are characterized by four interlocking carbohydrate rings:
A. Steroids
B. Amino acid-derived
C. Polypeptide and proteins
D. Eicosanoids
Inositol triphosphate (IP3) triggers the release of Ca2+ from the :
A. ribosome
B. Golgi complex
C. endoplasmic reticulum
D. mitochondria
Which one does NOT belong to negative feedback?
A. Childbirth
B. Regulation of TSH by T4
C. Regulation of TRH by TSH
D. Baroreceptor reflex
____ is the study of the endocrine glands or hormones.