Chapter 6 introduced an essential part of the cell: the. plasma membrane. Thanks to the selective permeability of. phospholipid bilayers and the activity of membrane trans-. port proteins, this structure creates an internal environment. that is different from conditions outside the cell. Our task.
When calcium levels decrease, this stimulates the parathyroid gland to release parathyroid hormone. Parathyroid hormone encourages the normal process of bone breakdown (essential for maintenance and growth of the bone). This process of bone breakdown releases calcium into the bloodstream.
1 Adrenocorticotropic hormone (ACTH) stimulates the adrenal glands. 2  Thyroid-stimulating hormone (TSH) stimulates the thyroid gland. 3  Follicle-stimulating hormone (FSH) stimulates the ovaries and testes. 4  Luteinizing hormone (LH) stimulates the ovaries and testes. Thyroid-stimulating hormone (TSH) stimulates the thyroid gland. 2  Follicle-stimulating hormone (FSH) stimulates the ovaries and testes. 3  Luteinizing hormone (LH) stimulates the ovaries and testes. 4  Melanocyte-stimulating hormone controls skin pigmentation or color.