Planner
Nov 20
T: Homeostasis
D: Explain the differences
between endothermic and
ectothermic
New Table of Contents on page 87
Date
11/15
11/18
11/19
11/20
Description
Tail Like This
SCAMPER
Vocabulary
Homeostasis
Get Out…
• Notebook
page #
88-89
90-91
92-93
94-95
DO NOW 94
What is the term for an
organism’s ability to blend
into the environment?
Give an example of one.
Homeostasis
the physical process that maintains a
stable internal environment.
(example: body temperature)
Endotherms
• animals that can generate
& regulate their own body
heat.
• Their body temperature
stays at a relatively
constant level by
balancing heat loss with
heat production.
• sometimes referred to as
"warm-blooded"
Minimize Heat Loss
• Heat loss is minimized in
most mammals by having
a thick coat of fur or thick
layer of fat beneath the
skin.
Making
Some Heat
• Digestion- Endotherms have to eat fairly
often because they burn calories to
support their body temperature as well as
other functions.
• Shivering – An involuntary movement
that generates heat.
Reduce Activity
Levels (Rest)
Find a cool spot
Cool it!
Pant
Sweat
All Ears!
Radiator ears are a special
adaptation
Some animals have large
ears that have blood vessels
close to the surface of the
skin. If the outside
temperature is cooler, heat is
released through the ears.
Ectotherms
• animals that rely on
environmental sources of
heat.
• sometimes called “cold
blooded” animals, are poorly
insulated and produce heat at
a low rate compared with
endotherms. They also lose
heat to cooler surroundings
quickly.
• regulate their body
temperatures by behaviors.
Regulate Body
Temperature
• Many ectotherms are able
to regulate their body
temperature behaviorally,
by moving into and out of
sunlight.
• burrowing under ground
/seeking shade
• Moving in and out of
water.
They Just Don’t Need the Calories!
• They therefore eat only
1/3 to 1/10 of the food
needed by endothermic
animals.
• an ectotherm has all this
energy available for
activity, growth, repair
and reproduction.
http://www.statemaster.com/encyclopedia/Ectothermic
Don’t eat
very often.
Types of Ectotherms
• Reptiles
• Amphibians
• Fish
• Insects
How?
• Snakes and lizards sunning themselves on
rocks.
• Fish changing depths in the water to find a
suitable temperature.
• Desert animals burrowing beneath the
sand during the day.
• Insects that warm their flight muscles by
vibrating them in place.
Exit Ticket
Explain and give an example of
an animal for cooling down for
both endothermic and
ectothermic.