Homeostasis

Question 1

ectotherm

Answer 1

reptiles and fish

cant control own body temp therefore rely on surroundings&environment

change their behaviour to control their body temp

Question 2

endotherm

Answer 2

mammals and birds

can control own body temperature

rely on metabolic activity to control body temp and their behaviour

Question 3

mechanisms used by mammals to INCREASE body temp (4)

Answer 3

shivering (muscles contract in spasms)

less sweat

hairs stand up (erector pili muscles contract)

vasoconstriction (arterioles near skin surface constrict to reduce heat loss as less blood flows through capillaries)

Question 4

mechanisms used by mammals to REDUCE body temp (3)

Answer 4

sweating

hair lies flat to trap air and provide insulation

vasodilation (arterioles near skin surface dilate so more blood flows through capillaries and heat is lost through radiation)