Chapter 7- Homeostasis Of Body Temp And Body Fluid

Question 1

Give the SRMERF for low body temp

Answer 1

S - Body Temperature falls
R – Cold thermoreceptor in skin and Hypothalamus stimulated
Nerve impulse sent to
M – Hypothalamus which
Increases sympathetic stimulus to
E - Arteriole muscles in the skin causing contraction
R – Vasoconstriction of blood vessel (arteriole) occurs reducing heat loss to environment
F – Body temperature begins to rise

Question 2

Give the SRMERF for high body temp

Answer 2

S - Body Temperature rises
R – heat thermoreceptor in skin and Hypothalamus stimulated
Nerve impulse sent to
M – Hypothalamus which
Increases sympathetic stimulus to
E - muscles around sweat glands causing contraction and sweat to be secreted onto skin, Vasodilation of blood vessel (arteriole) occurring at the same time continually supplies water which moves into sweat gland from high temperature blood plasma
R – evaporation of high temperature sweat causes heat loss
F – Body temperature begins to fall

Question 3

Give the SRMERF for low water content or high osmotic pressure

Answer 3

S – High osmotic pressure in the blood (low water content)
R – Osmoreceptors in hypothalamus stimulated
M – Hypothalamus responds
Increases secretion of ADH to nerve extensions (travels to posterior Pituitary Gland)
E – Pituitary gland secretes increased amount of ADH supplied.
R – More ADH secreted increases water permeability of the distal convoluted tubule and collecting ducts.
F – More water reabsorbed into blood lowering osmotic pressure.