Communication and Homeostais Flashcards
Why is CO2 build up toxic
It increases ph of tissue fluid
Features of a good communication system
Cover whole body
Enable cells to communicate
Enable rapid communication
Enable specific communication
Enable both long and short term responses
Example of positive feedback
Dilation of cervix
endotherm
control their body temperature within very strict limits. use a variety of differen methods tocontrol temperature and are largely independent of external conditions
ectotherm
not able to coontrol their body temperature as endotherms. rely on external conditions. can only control temperature throygh behavioural responses
behavioural responses of ectotherms to high external temperatures
move out of sun
move underground
reduce SA exposed to sun
advantages of ectothermy
less food used in respiration
more energy and nutrients are used for growth
need to find less food
can survive long periods without food
disadvantages of ectothermy
less active in colder temperatures
at risk of predators in cold
what hapens to the skin of endotherms when the body is too hot
sweat glands secrete fluid onto skin surface
hairs and feathers lie flat to reduce insulation
vasodilation of arterioles and precapillary sphincters
how is the gaseous exchange system used to control temperature in endotherms
some animals pant when the body is too hot.this increaces evaporation of water from lungs
how is the liver used to control body temperature of endotherms
control of respiration in liver cells means more or less energy from food is converted into heat
how are skeletal muscles used to control body temperature in endotherms
contractions can generate heat
disadvantages of endothermy
use significant amount of energy to mantain body temp
need more food
less enegy and nutrients used for growth
may overheat in hot weather
role of peripheral temperature receptors
if temperature of extremities change this information can be sent to the brain to prepair regulation of core temperature
