PSY290H5 Lecture Notes - Diencephalon, Semipermeable Membrane, Paraventricular Nucleus Of Hypothalamus
Document Summary
Chapter 9 temperature regulation, thirst, and hunger. Adaptations to temperature: endotherms mammals, birds. Inside; have to reply on internal factors: ectotherms amphibians, reptiles, fish. Outside; have to rely on external factors. Goal-directed behaviour action to satisfy the need. Satisfaction of need hunger is satisfied thirst is quenched. Behavioral responses to heat and cold: ectotherms more dependent on behavioural devices, changes in position, weight, colour, composition of fur. Automatic internal response to deviations in temperature: responses to lower temperatures. Body constricts blood vessels which takes blood away from the surface of the skin; therefore preserving heat (internal) Thyroid gland releases an increase thyroid hormone, which increases metabolic activity (chemical reactions in the body: responses to higher temperatures. Blood vessels start to dilate (become bigger) then loses the heat through the skin (become red) Deviations in human core temperature: fever. If occurring because of bacteria/virus, a result can be pyrogens (chemical bi-products) which have the ability to cross the blood- brain barrier.
