The center of these glands manufactures adrenaline.
这些腺

分泌肾上腺素。
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语版 TED-Ed 演讲精选 We also talked about how epithelial cells are polar, having both apical and basal sides, and are selectively permeable, and lastly we took a brief look at how our glandular epithelial tissue forms both out endocrine and exocrine glands.
我们还讨论了上皮细胞是如何极性
,具有顶端和基底两侧,并且具有选择性渗透性,最后我们简要了解了我们
腺上皮组织如何形成内分
腺和外分
腺。