Regulations of sodium and water intakes are linked

Info icon This preview shows pages 14–23. Sign up to view the full content.

View Full Document Right Arrow Icon
Regulations of sodium and water intakes are linked The kidneys use sodium to conserve water AVP/ADH increases water permeability of duct resulting in more water retention.
Image of page 14

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

View Full Document Right Arrow Icon
Osmoreceptors & Motivational responses OVLT projects: to PVN to stimulate ADH secretion. to LH to stimulate motivational responses via limbic circuit. LH
Image of page 15
Types of Thirst Volumetric Volumetric thirst (water) and salt appetite Baroreceptors in the heart and large blood vessels- stretch receptors Release of ADH Receptors in kidney that detect decreases in blood flow Release of renin Renin coverts angiotensinogen to angiotensin II Angiotensin II Release of AVP/ADH and release of aldosterone by adrenal Increase in blood pressure Initiates drinking and salt appetite
Image of page 16

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

View Full Document Right Arrow Icon
Image of page 17
Neural Circuit for Thirst The atrial barareceptors send a projection to the nucleus of the solitary tract (NST) The NST projects to the median preoptic nucleus The OVLT (osmoreceptors) and the SFO (angiotensin II) project to the median preoptic nucleus The median preoptic nucleus is where the thirst information goes and it controls drinking behaviors
Image of page 18

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

View Full Document Right Arrow Icon
Image of page 19
Hypovolemic Thirst The baroreceptors in the heart communicate low pressure to N. Sol. Tract (via vagus nerve) which projects to hypothalamus. Ang II also acts on SFO which projects to hypothalamus. Hypothalamus integrates signals to trigger behavioral effectors (i.e. increase fluid motivation = thirst and increase fluid seeking behavior).
Image of page 20

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

View Full Document Right Arrow Icon
Diet determines sodium appetite Herbivores: Obtain sodium from plants (component of cells) But sodium content varies seasonally and from place to place. Carnivores: The animals carnivores eat must maintain their own sodium balance. So the carnivores are not under the same salt pressures as herbivores (except when there is blood loss).
Image of page 21
Behavioral Homeostasis Under normal conditions, physiological homeostasis maintains sodium balance (kidney, aldosterone=sodium conservation).
Image of page 22

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

View Full Document Right Arrow Icon
Image of page 23
This is the end of the preview. Sign up to access the rest of the document.

{[ 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