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ENVIRONMENTAL STIMULI
AND PHYSICAL RESPONSES
OF ANIMALS
2/23/16
Animals have physical responses that are caused by
environmental stimuli.
 To maintain an internal temperature, animals respond to
temperature changes by:
Shedding
Panting
Shivering
SHEDDING
1. During cold weather, animals generate thick fur or feather
for the purpose of maintain an internal temperature.
2. In hot weather, animals will shed this extra covering and
cooling their body.
SWEATING
1. Is an organism’s major way of getting rid of excess body
heat.
2. When sweat evaporates from the surface of the skin, it
cools the animal.
PANTING
1. Is another way of getting rid of excess body heat.
2. When an animal pants (breathes heavily), increased air flow causes
an increase in evaporation from animals mouth and lungs , cooling
the animal.
SHIVERING
1. Shivering is a mammals way of increasing heat production.
2. It is an involuntary process due to the drop of temperature
outside or within the body.
3. It is a method that the body uses to increase the rate at which
energy is transformed in to heat .
COMMON RESPONSES TO CHANGE IN
ENVIRONMENTAL STIMULI
1. Blinking
2. food gathering
a. storing food
b. storing nutrition in the form of fat
BLINKING
1. Blinking is an automatic response that help protect the eye.
2. Some animals need to blink to keep the eye covered with a
tear film.
3. The tear film protect the eye from drying and infections.
4. The blink response also protects the eye from being injured
if a foreign object comes close to the eye.
FOOD GATHERING
Finding food by hunting or fishing or gathering of seeds might be
seasonal. So, animals might:
a. store foods: animals with gather and store foods for the winter.
E.g. squirrels, mice, beavers
b. Store nutrition in the form of fat: many animals may overeat
and reduce their physical activity to conserve energy during cold
weather or a drought.
E.g. bears, penguins, walruses, ants and chipmunks.