Endocrine glands secrete amino acids.

food is to nourish as () A: organ is to secrete B: fluids is to circulate C: cells is to degenerate D: antibodies is to protect E: fats is to saturate

Glands<br/>that secrete substances into the extracellular fluid that surrounds<br/>them are known as _____ glands. A: sweat B: exocrine C: endocrine D: sebaceous

Most amphibians have glands in their skin that secrete mucous. This helps them A: catch prey B: absorb water C: fight off bacterial infections D: attract mates

Paratfollicular cells or C cells of thyroid also secrete calcitonin, which has the function of ( ). A: Enhancing osteoblast activity B: Promoting the conversion of bone calcium into blood calcium C: Promoting calcification of bone tissue D: Reducing blood calcium E: Elevating blood calcium

In the thymus, thymic stromal cells(TSCs) are interconnected into a network structure. These cells carry a large number of surface molecules and can secrete a variety of thymic hormones and cytokines, which provides a suitable microenvironment for the development and maturation of thymocytes. The types of TSCs include ( ). A: epithelial cell B: macrophage C: dendritic cell D: neutrophil