Download Thermal Homeostasis

Warm-Up (10/12)
Describe what happens to an
enzyme placed at high
temperatures.
Thermal Homeostasis
UNIT
2E
Thermal Homeostasis
Food (carbohydrates, lipids
and proteins) is essentially
many carbon atoms bound
together.
UNIT
2E
Thermal Homeostasis
Food (carbohydrates, lipids
and proteins) is essentially
many carbon atoms bound
together.
Metabolism of food means:
• exergonic release of
energy between carbon
atoms and
UNIT
2E
energy
Thermal Homeostasis
Food (carbohydrates, lipids
and proteins) is essentially
many carbon atoms bound
together.
Metabolism of food means:
• exergonic release of
energy between carbon
atoms and
• release of CO2 as matter.
UNIT
CO2 2E
CO2
energy
Thermal Homeostasis
Food (carbohydrates, lipids
and proteins) is essentially
many carbon atoms bound
together.
Metabolism of food means:
• exergonic release of
energy between carbon
atoms and
• release of CO2 as matter.
Released energy is either:
• coupled to endergonic
reactions, or
UNIT
2E
Thermal Homeostasis
Food (carbohydrates, lipids
and proteins) is essentially
many carbon atoms bound
together.
Metabolism of food means:
• exergonic release of
energy between carbon
atoms and
• release of CO2 as matter.
Released energy is either:
• coupled to endergonic
reactions, or
• released as heat
UNIT
2E
Thermal Homeostasis
Food (carbohydrates, lipids
and proteins) is essentially
many carbon atoms bound
together.
Metabolism of food means:
• exergonic release of
energy between carbon
atoms and
• release of CO2 as matter.
Released energy is either:
• coupled to endergonic
reactions, or
• released as heat
Organisms store energy:
• Animals use fat (lipid) and glycogen (carb)
• Plants use oils (lipid) and starch (carb)
UNIT
2E
UNIT
CTQ #1
Predict what happens to an organism
which consumes more energy than is
required, and predict what happens to an
organism which uses more energy than it
consumes.
2E
UNIT
Thermal Homeostasis
2E
Generally, the smaller the organism, the higher the
rate of metabolism.
low rate
HIGH
rate
Thermal Homeostasis
Generally, the smaller the organism, the higher the
rate of metabolism.
Organisms regulate body temperature to maintain
efficiency of metabolism and enzyme function:
UNIT
2E
Thermal Homeostasis
Generally, the smaller the organism, the higher the
rate of metabolism.
Organisms regulate body temperature to maintain
efficiency of metabolism and enzyme function:
• Endothermic animals keep a
constant body temperature.
when it’s too hot
when it’s too cold
UNIT
2E
UNIT
Thermal Homeostasis
2E
Generally, the smaller the organism, the higher the
rate of metabolism.
Organisms regulate body temperature to maintain
efficiency of metabolism and enzyme function:
• Endothermic animals keep a
constant body temperature.
• Exothermic animals’ body
temperature depends on the
environment.
less active when cold
more active when hot
UNIT
Thermal Homeostasis
2E
Generally, the smaller the organism, the higher the
rate of metabolism.
Organisms regulate body temperature to maintain
efficiency of metabolism and enzyme function:
• Endothermic animals keep a
constant body temperature.
Ewwwwwww!
• Exothermic animals’ body
temperature depends on the
environment.
Autumn
Plants and animals time the
mating season to ensure a welltimed birthing season.
Awwwwwww!
Spring
UNIT
CTQ #2
2E
Endothermic organisms maintain a constant
body temperature, whereas the body
temperature of exothermic organisms matches
that of the environment. Predict which kind of
organism requires more energy on average to
maintain homeostasis, and justify your
prediction.
Closure
Describe TWO examples of
mechanisms by which animals maintain
thermal homeostasis.