Understanding the Endocrine System and Hormones

What is the primary role of the endocrine system during puberty?

• To regulate body temperature

• To manage emotional stability

• To control appetite

• To coordinate physical and hormonal changes

How does the body send messages to distant parts?

• Using magnetic fields

• Through electrical signals

• Via chemical messengers called hormones

• By direct nerve connections

What historical experiment helped identify the role of hormones?

• Observing plant growth

• Measuring body temperatures

• Reattaching testicles to castrated chickens

• Injecting hormones into frogs

Why can't the nervous system alone manage long-term changes like puberty?

• It doesn't affect the brain

• It is too slow

• It requires constant nerve firing

• It only works for short distances

What is a key difference between the nervous and endocrine systems?

• The nervous system uses hormones

• The endocrine system is faster

• The nervous system uses electrical signals

• The endocrine system is only in animals

How do hormones maintain stability in the body?

• By increasing body temperature

• By changing cell structure

• By synchronizing body functions

• By altering DNA

What is an example of a hormone's role in different species?

• Prolactin in humans and birds

• Adrenaline in plants

• Insulin in fish

• Melatonin in bacteria

What does the presence of similar hormones in different species suggest?

• Hormones are unique to humans

• Hormones are only found in animals

• Hormones evolved recently

• Hormones are an ancient communication method

How did scientists historically test for pregnancy using hormones?

• By observing skin changes

• By testing blood sugar levels

• By injecting urine into animals

• By measuring body temperature

What is a common feature of hormones across different life forms?

• They are visible to the naked eye

• They are only found in mammals

• They are used for digestion

• They serve as chemical messengers