Just a few more hormones to cover here. First up, growth hormone, which is a peptide hormone secreted by the anterior pituitary that generally leads to increased growth. Behind me, you can see one of the tallest people in history, Robert Wadlow, who had an excess of human growth hormone that led to his massive size. Now the pancreas is both an endocrine gland and an exocrine gland. It's going to have exocrine functions in the digestive system, and endocrine functions that include the secretion of somatostatin, which is a peptide hormone that inhibits the effects of growth hormone. Now the pancreas is better known for its endocrine involvement in blood sugar homeostasis, by secreting the hormones insulin and glucagon. The pancreas is going to produce its hormones in these special clusters of cells called islets of Langerhans. Now, if we look at the human body here, you can see the pancreas, sort of, nestled on top of the intestines. We can see that it has these cell clusters like you see here. Those are islets of Langerhans, and they're going to contain alpha cells, beta cells, and delta cells. Now alpha cells produce glucagon, beta cells produce insulin, and delta cells produce somatostatin. The pancreas is actually going to receive hormonal signals from the duodenum during digestion, in the form of secreting. This hormone released by the duodenum to the pancreas is going to stimulate bicarbonate secretion from the pancreas, which is important when the chyme, during digestion, hits the duodenum. You know, all that acid needs to be neutralized. Now, hunger and satiation, or sort of the feelings of being hungry and being full, are controlled by a pair of hormones that have antagonistic effects. Hopefully, you're noticing that pattern thus far. There are lots of hormones that act in pairs and have effects that counter each other. Now leptin is going to be the hormone produced by adipocytes, or fat cells, and it has receptors in the hypothalamus that inhibit appetite. So, you know, if you think about it in terms of, you know, eating a big meal, taking in lots of nutrients, including some fats, those adipocytes are going to stimulate satiation. Ghrelin is a hormone that works opposite to leptin and actually stimulates appetite. And here you can see a pair of mice, and what's interesting is this giant mouse over here has actually been manipulated so that it does not respond to leptin. And because it doesn't respond to leptin, it doesn't get that appetite inhibition and will overeat. Alright. That's all I have for this one. I'll see you guys next time.
Table of contents
- 1. Introduction to Biology2h 40m
- 2. Chemistry3h 40m
- 3. Water1h 26m
- 4. Biomolecules2h 23m
- 5. Cell Components2h 26m
- 6. The Membrane2h 31m
- 7. Energy and Metabolism2h 0m
- 8. Respiration2h 40m
- 9. Photosynthesis2h 49m
- 10. Cell Signaling59m
- 11. Cell Division2h 47m
- 12. Meiosis2h 0m
- 13. Mendelian Genetics4h 44m
- Introduction to Mendel's Experiments7m
- Genotype vs. Phenotype17m
- Punnett Squares13m
- Mendel's Experiments26m
- Mendel's Laws18m
- Monohybrid Crosses19m
- Test Crosses14m
- Dihybrid Crosses20m
- Punnett Square Probability26m
- Incomplete Dominance vs. Codominance20m
- Epistasis7m
- Non-Mendelian Genetics12m
- Pedigrees6m
- Autosomal Inheritance21m
- Sex-Linked Inheritance43m
- X-Inactivation9m
- 14. DNA Synthesis2h 27m
- 15. Gene Expression3h 20m
- 16. Regulation of Expression3h 31m
- Introduction to Regulation of Gene Expression13m
- Prokaryotic Gene Regulation via Operons27m
- The Lac Operon21m
- Glucose's Impact on Lac Operon25m
- The Trp Operon20m
- Review of the Lac Operon & Trp Operon11m
- Introduction to Eukaryotic Gene Regulation9m
- Eukaryotic Chromatin Modifications16m
- Eukaryotic Transcriptional Control22m
- Eukaryotic Post-Transcriptional Regulation28m
- Eukaryotic Post-Translational Regulation13m
- 17. Viruses37m
- 18. Biotechnology2h 58m
- 19. Genomics17m
- 20. Development1h 5m
- 21. Evolution3h 1m
- 22. Evolution of Populations3h 52m
- 23. Speciation1h 37m
- 24. History of Life on Earth2h 6m
- 25. Phylogeny2h 31m
- 26. Prokaryotes4h 59m
- 27. Protists1h 12m
- 28. Plants1h 22m
- 29. Fungi36m
- 30. Overview of Animals34m
- 31. Invertebrates1h 2m
- 32. Vertebrates50m
- 33. Plant Anatomy1h 3m
- 34. Vascular Plant Transport2m
- 35. Soil37m
- 36. Plant Reproduction47m
- 37. Plant Sensation and Response1h 9m
- 38. Animal Form and Function1h 19m
- 39. Digestive System10m
- 40. Circulatory System1h 57m
- 41. Immune System1h 12m
- 42. Osmoregulation and Excretion50m
- 43. Endocrine System4m
- 44. Animal Reproduction2m
- 45. Nervous System55m
- 46. Sensory Systems46m
- 47. Muscle Systems23m
- 48. Ecology3h 11m
- Introduction to Ecology20m
- Biogeography14m
- Earth's Climate Patterns50m
- Introduction to Terrestrial Biomes10m
- Terrestrial Biomes: Near Equator13m
- Terrestrial Biomes: Temperate Regions10m
- Terrestrial Biomes: Northern Regions15m
- Introduction to Aquatic Biomes27m
- Freshwater Aquatic Biomes14m
- Marine Aquatic Biomes13m
- 49. Animal Behavior28m
- 50. Population Ecology3h 41m
- Introduction to Population Ecology28m
- Population Sampling Methods23m
- Life History12m
- Population Demography17m
- Factors Limiting Population Growth14m
- Introduction to Population Growth Models22m
- Linear Population Growth6m
- Exponential Population Growth29m
- Logistic Population Growth32m
- r/K Selection10m
- The Human Population22m
- 51. Community Ecology2h 46m
- Introduction to Community Ecology2m
- Introduction to Community Interactions9m
- Community Interactions: Competition (-/-)38m
- Community Interactions: Exploitation (+/-)23m
- Community Interactions: Mutualism (+/+) & Commensalism (+/0)9m
- Community Structure35m
- Community Dynamics26m
- Geographic Impact on Communities21m
- 52. Ecosystems2h 36m
- 53. Conservation Biology24m
43. Endocrine System
Endocrine System
Struggling with General Biology?
Join thousands of students who trust us to help them ace their exams!Watch the first videoVideo duration:
3mPlay a video:
Related Videos
Related Practice
Endocrine System practice set
