Notes Anatomy & Physiology II Endocrine System 8 Posterior Pituitary Gland

Notes Anatomy & Physiology II Endocrine System 8 Posterior Pituitary Gland

Info icon This preview shows pages 1–2. Sign up to view the full content.

Anatomy & Physiology II AHS 132 Chapter 18 The Endocrine System Posterior Pituitary Gland (Neurohypophysis) • Stores but • Does not synthesize hormones • Consists of axon terminals of hypothalamic neurons • Neurons release two neurotransmitters that enter capillaries – antidiuretic hormone – oxytocin Oxytocin • Two target tissues both involved in neuroendocrine reflexes During delivery baby’s head stretches cervix hormone release enhances uterine muscle contraction baby & placenta are delivered • After delivery – suckling & hearing baby’s cry stimulates milk ejection – hormone causes muscle contraction & milk ejection Oxytocin during Labor • Stimulation of uterus by baby • Hormone release from posterior pituitary Uterine smooth muscle contracts until birth of baby • Baby pushed into cervix, increase hormone release • More muscle contraction occurs • When baby is born, positive feedback ceases
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Antidiuretic Hormone (ADH) • ADH Secreted during dehydration • Over-hydration - ADH inhibited • ADH also known as vasopressin • Functions – decrease urine production – decrease sweating – increase BP The Thyroid Gland • Thyroglobulin (Globular Protein) – Synthesized by follicle cells – Secreted into colloid of thyroid follicles –Molecules contain the amino acid tyrosine • Thyroxin (T4) – Also called tetraiodothyronine – Contains four iodide ions • Triiodothyronine (T3) – Contains three iodide ions Formation of Thyroid Hormone • Iodide trapping by follicular cells • Synthesis of thyroglobulin (TGB) • Release of TGB into colloid • Iodination of tyrosine in colloid • Formation of T3 & T4 by combining T1 and T2 together • Uptake & digestion of TGB by follicle cells • Secretion of T3 & T4 into blood...
View Full Document

  • Spring '14
  • AlbertGrazia
  • Vasopressin, Oxytocin, hormone release

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern