1. How do endocrine glands deliver their secretions to tissues throughout the body?
2. What best describes a hormone in the endocrine system?
3. What did Berthold’s 1849 rooster experiment suggest about the testes?
What do endocrine glands secrete directly into the bloodstream?
Hormones
How are hormones transported throughout the body?
By the bloodstream
What are hormones in the endocrine system?
Chemical messengers producing effects on target cells or organs
What effect do hormones have on target cells or organs?
They produce a specific effect
What experiment did Berthold perform in 1849 with roosters?
He castrated roosters and replaced their testes
What behaviors were restored in roosters after testis replacement in Berthold's 1849 study?
Crowing, fighting, mating behavior, body size, and feathers
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