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1. 2. Endocrine glands secrete hormones directly into cells or extracellular fluid. Although most of the body cells are exposed to hormones, only target cells that contain the appropriate receptor proteins are able to respond.

1. 2. Endocrine glands secrete hormones directly into cells or extracellular fluid. Although most of the body cells are exposed to hormones, only target cells that contain the appropriate receptor proteins are able to respond.

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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1. 2. Endocrine glands secrete hormones directly into cells or extracellular fluid. Although most of the body cells are exposed to hormones, only target cells that contain the appropriate receptor proteins are able to respond.
Transcribed Image Text:1. 2. Endocrine glands secrete hormones directly into cells or extracellular fluid. Although most of the body cells are exposed to hormones, only target cells that contain the appropriate receptor proteins are able to respond.
3. The secretion of most hormones is controlled by a positive feedback mechanism. 4. Specialized endocrine cells form the islets of Langerhans in the liver. 5. The level of glucose in the blood decreases after meals. 6. The beginning of the ovarian cycle is stimulated by the release of follicle-stimulating hormone (FSH). 7. The corpus luteum acts like an endocrine gland secreting estrogen, progesterone, and inhibin. 8. Melatonin is secreted if blood pressure falls below normal levels.
Transcribed Image Text:3. The secretion of most hormones is controlled by a positive feedback mechanism. 4. Specialized endocrine cells form the islets of Langerhans in the liver. 5. The level of glucose in the blood decreases after meals. 6. The beginning of the ovarian cycle is stimulated by the release of follicle-stimulating hormone (FSH). 7. The corpus luteum acts like an endocrine gland secreting estrogen, progesterone, and inhibin. 8. Melatonin is secreted if blood pressure falls below normal levels.
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