1. how do endocrine glands the body maintain homeostasis?
• they transport oxygen, nutrients, carbon dioxide and waste
• they control body activities by releasing hormones into the blood
• they distinguish between “self” and “other”.

2. the system that all others maintain homeostasis by transportiung oxygen, nutrients, carbon dioxide and wastes is the
• circulatory system
• digestive system
• respiratory system

3. one advantage to being an ectotherm is that an ectotherm
• can generate its own body heat
• needs less energy to maintain homeostasis
• can survive easily in colder climates

4. a good way for a lizard to conserve its body heat in cold, windy weather would be to
• retreat to an underground burrow
• bask in the sun on an exposed rock
• sit in the shade of a tree

5. an endotherm is an animal that
• regulates its body temperature by staying in the sun
• regulates its body temperature by living underground
• regulates its body temperature partly by generating its own body heat

The circulatory system transports oxygen and nutrients through the blood to the every single cell of the organism. Also, it picks up carbon dioxide and wastes and removes them from the organism. That way, it helps all other systems to maintain homeostasis. Without circulatory system in the organism, the cells would die because they would not get nutrients and oxygen and the waste and carbon dioxide would not be excreted from them.

Q3. The answer is • Needs less energy to maintain homeostasis.

Ectotherms (cold-blooded animals) are organisms that cannot maintain their body temperature which depends on environmental conditions. Endotherms (warm-blooded animals) are able to maintain body temperature and do not depend on changes in environmental conditions. However, to maintain homeostasis, endotherms must generate heat and this requires energy. On the other hand, ectotherms do not generate heat to maintain temperature, so they need less energy to maintain homeostasis.

Q4. The answer is • Bask in the sun on an exposed rock 

As an ectotherm (a cold-blooded animal), a lizard cannot maintain its body temperature. It depends on the environmental conditions. In order to conserve its body heat in cold weather, it will bask in the sun on an exposed rock. Exposed rock is already warm and by basking there in the Sun, he will absorb warmth through its thin skin and its internal temperature will rise. Its muscles will warm up and will be prepared for hunting or running from predators.

Q5. The answer is  • Regulates its body temperature partly by generating its own body heat.

Endotherms are warm-blooded animals. Their body temperature is maintained within a narrow range. To maintain their temperature, they must generate their own heat. However, this is not the only way to regulate the body temperature. They sweat or pant, so they can cool their body if necessary. Some animals can survive cold weather through torpor when their body temperature can drop temporarily.

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