Your body protects itself when germs enter., Endocrine system, Immune system, Nervous system, Your heart beats faster when you feel nervous before a presentation., Endocrine system, Immune system, Nervous system, Your body remembers and fights the same germ faster next time., Endocrine system, Nervous system, Immune system, Your body reacts quickly when you hear a loud noise., Endocrine system, Immune system, Nervous system, Hormones help your body grow during teenage years., Nervous system, Immune system, Endocrine system.

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