They can maintain a constant body temperature. Their internal body temperature gets hotter or colder based on the temperature outside. So, they cannot maintain constant body temperature. Example- Mammals and birds. Reptiles, insects, and fish amphibians. They obtain energy from food consumption. They obtain energy from the surrounding environment.
Effect of Body Fat. Fat is pretty important for mammals or hot blooded animals as it helps animals like seals and whales to keep warm in the freezing oceans. Here, more fat causes overheating of the bodies that may also result in death. Chances of infections or diseases. The constant heat of the bodies provide a perfect incubator for germs and are prone to get sick or infections. Cold blooded animals do not cultivate the germs easily thus preventing infections.
However, if the bodies are cold for too long they will be unable to fight off infections and disease. Humans can even survive the coldest temperatures of Antarctica. Most of this category of animals maintain a body temperature of around 37 degrees Celsius. A cold-blooded creature has exactly the same body temperature as its environment.
Brains get activated for mammals with the intake of food that produces heat and energy. A cold-blooded animal has a body temperature that varies along with the outdoor temperature, and a cold-blooded person is someone who seems to feel no emotions.
Your pet lizard may love you, but she's still cold-blooded. During a hot, sunny day, a cold-blooded animal like a snake experiences a rise in body temperature, which it can only moderate by finding a shady spot to hide. When the sun goes down at night, a snake's body temperature falls. Special air sacs, which extend from the lungs, increase the amount of air the birds can breathe in and out. Warm-blooded animals can be as active in winter as summer, but their bodies must have plenty of food to burn for additional heat.
Cold-blooded animals cannot generate their own body heat, but they do regulate it by changing their environment. Alligators and other reptiles often lie in the sun to warm themselves. On the other hand, they cool off by taking a dip in the water, moving into the sade of a rock or crawling into a burrow in the ground.
Heat escapes from the body through the skin. Layers of clothing help you retain your body heat in the winter. Other mammals must rely on layers of fat or a fur covering to insulate them from the cold and retain their body heat.
A lot of extra food would be required to replace the heat lost from these large surfaces—food that would be extremely hard to find. Smaller animals must produce more heat to keep warm than larger ones. To understand this, pretend that a 3-inch-square box is a small animal and a 6-inch-square box is a larger animal. On its six exposed sides, the small animal has 54 square inches of skin.
The larger animal has square inches of skin, or four times as much. The inside heat-producing area of the small animal is 27 cubic inches, but the inside of the larger animal contains cubic inches, which is eight times bigger. This means it must produce twice as much heat. Because small bodies must produce so much heat to stay warm, the size of warm-blooded animals is limited.
If the animal were too small, it could not digest food fast enough to produce heat as quickly as warmth could be lost through the skin. During the day a tiny hummingbird refuels its furnace with food every ten to fifteen minutes.
Torpor is a type of sleep from which an animal cannot be awakened quickly. Its body temperature drops to that of its surroundings, and the heartbeat and breathing are slowed down greatly. If the temperature drops too low, the animal will freeze and never awaken from torpor. True hibernators pass in and out of torpor throughout the winter.
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