The Exocrine System

(Example Animal Presentation)

What is the endocrine system?

• Endocrine system – system of glands, each of which secretes a type of hormone to regulate the body

• Signals are passed through the blood to target cells or organs– Hormones fit like a

piece of a puzzle into the target cell.

What are the main features of the endocrine system?

• Hormones – molecule (protein or lipid) that is transported throughout the body through blood and stimulates organs to respond in certain ways

• Endocrine glands – ductless glands that produce hormones

• Target cells – cells that the hormones bind to in order to trigger a response

Why is the endocrine system important?

• Environment is always changing – animals need a way to help them keep up with it.

• Ex. A high level of CO2 is detected in

the brain…!!!

Endocrine System in Class Insecta

• Metamorphosis – change in form– series of molts as

the larva or nymph grows into an adult

Endocrine System in Class Insecta

• Metamorphosis is controlled by hormones– Molting is

controlled by ecdyson

– Final transition to adult is controlled by juvenile hormone

• Absence of hormone stops molting process

Endocrine System in

Class Mammalia

• controls metabolism• maintains water

balance• regulates the level of

calcium in the blood• aids in the development

of a proper immune response

• helps the body respond to stress

• aids in the development of a proper immune response

• helps the body respond to stress

• regulates daily sleep-wake cycles

• regulates the level of glucose in the blood

• helps in the development of male/female secondary sex characteristics

• helps in the production of eggs, sperm

http://www.youtube.com/watch?v=kIPYVV4aThM

How does the endocrine system interact with other

animal body systems?• Circulatory System: Transports hormones

to target cells throughout the body

• Respiratory System: Can increase or decrease respiratory rate depending on CO2 levels in the brain

• Reproductive System: Helps in the produce of sperm and egg (which are necessary for reproduction)

Interesting Fact

In the insect world the largest number ofmolts is shown by the silver fish. It canchange its exoskeleton up to 50 times. It

is aprimitive winglessinsect which keeps growing throughout its life.

Interesting Fact

Diabetes is a disease of the endocrinesystem.

Too much glucose is present in the blood

because:-body can’t produce enough insulin-cells do not respond properly to insulinproduced

Sources

• “Biology: Living Systems” (Oram, Hummer, Smoot)

• “Biology” (Miller, Levine)

• http://insects.about.com/od/growthmetamorphosi1/ss/typesmetamorph_4.htm

• http://www.umd.umich.edu/eic/aquatic_insecta/insect_metamorphosis.htm

Test Question

All of the following are important parts of the

endocrine system EXCEPTa. blood streamb. hormonesc. lungs

*not to be included on your powerpoint…