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Hormones and Metabolism Option D5

Hormones and Metabolism Option D5. D5.1 State that hormones are chemical messengers secreted by endocrine glands into the blood and transported to specific target cells. Pituitary Gland. Pineal Gland. Thyroid Gland. Thymus. Adrenal Gland. Pancreas. Ovary. Testis.

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Hormones and Metabolism Option D5

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  1. Hormones and Metabolism Option D5

  2. D5.1State that hormones are chemical messengers secreted by endocrine glands into the blood and transported to specific target cells. Pituitary Gland Pineal Gland Thyroid Gland Thymus Adrenal Gland Pancreas Ovary Testis

  3. D5.2 Steroid hormones bind to receptor proteins in the cytoplasm of the target cell to form a receptor-hormone complex. D5.3 The receptor-hormone complex promotes the transcription of specific genes. http://highered.mcgraw-hill.com/sites/0072437316/student_view0/chapter47/animations.html#

  4. D5.4 Peptide hormones bind to receptors in the plasma membrane of the target cell. D5.5 Binding of hormones to membrane receptors activates a cascade mediated by a second messenger inside the cell.

  5. D5.6 The hypothalamus controls hormone secretion by the anterior and posterior lobes of the pituitary gland.

  6. D5.7 Hormones secreted by the pituitary control growth, developmental changes, reproduction and homeostasis.

  7. D5.7 Hormones secreted by the pituitary control growth, developmental changes, reproduction and homeostasis.

  8. D5.7 Hormones secreted by the pituitary control growth, developmental changes, reproduction and homeostasis.

  9. D5.a2 Control of milk secretion by oxytocin and prolactin. Oxytocin and prolactin are two hormones directly related to lactation. • What stimulates the secretion of milk? • Low estrogen level (as a result of • birthing process) causes prolactin to • stimulate the milk-producing cells of • the breast to begin releasing milk. • High oxytocin level causes contraction • of smooth muscles surrounding the • ducts carrying the milk, which results • in milk ejection. Production of both oxytocin and prolactin is increased by stimulation caused by a suckling infant. This is controlled by positive feedback.

  10. Example 1: control of ADH (vasopressin) secretion by negative feedback.

  11. Example 1: control of ADH (vasopressin) secretion by negative feedback.

  12. Example 2: regulating temperature by negative feedback. Click for animation

  13. Example 2: regulating temperature by negative feedback.

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