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Chapter 12

PSB 3002 Chapter Notes - Chapter 12: Lamina Terminalis, Extracellular Fluid, Angiotensin

Course Code
PSB 3002
Bethany Stennett

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Chapter 12
a. Ingestive Behavior- Physiological Regulatory Mechanisms and Drinking
Regulatory system:
o System variable: regulated variable
o Set poit: syste ariale’s optial alue
o Detector: measures system variable
o Correctional mechanism: changes system variable
Some examples of regulatory systems are body fluid control and nutrient control
3 major fluid compartments:
o Intracellular
o Interstitial
o Intravascular: Na+ and water passes between intravascular and interstitial fluid, but Na+
a’t pass the ell embrane
Hypertonic: cell loses water, hypotonic: cells gain water
Osmometric thirst: interstitial fluid becomes hypertonic and the cells lose water
Volumetric thirst: body evaporates fluid, blood loss, vomiting, diarrhea
o Blood flow decreases, renin is secreted and turns plasma angiotensinogen to
angiotensin I
o Angiotensin II is a hormone that increases blood pressure and facilitates the secretion of
water and sodium from the kidneys
Lamina terminalis (median preoptic nucleus) receives osmometric and columetric information
o Information reaches the median preoptic nucleus from the SFO
b. Ingestive Behavior- Eating: Some Facts about Metabolism
2 phases in Metabolism
o Absorptive phase: glucose, amino acids, fats are received from the intestines. Insulin
levels are high and cells metabolize glucose. Glucose is turned into glycogen by the livers
andn the muscles. Carbs and amino acids turned into fats and taken to the adipose
o Fasting phase: PNS activity decreases, SNS activity increases. Insulin levels fall and
glucagon and adrenal catecholamines increase.
o Liver gylogen turned into glucose
o Triglycerides broken down and turns into glycerol and fatty acids
o Because insulin is decreased, only CNS can use blood glucose. Other body parts use fatty
o Glycerol turned into glucose by liver and is then metabolized by the brain
c. Ingestive Behavior- What Starts a Meal?
Natural selection encourages eating, prevents overeating and weight gain
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