Updated Biology Courses cardella

General Biology
Prof. Bryan Cardella, M.Ed.

ap biology eaton

AP Biology 
Dr. Carleen Eaton, M.D.

Loading video...
This is a quick preview of the lesson. For full access, please Log In or Sign up.
For more information, please see full course syllabus of Biology
Bookmark & Share Embed

Share this knowledge with your friends!

Copy & Paste this embed code into your website’s HTML

Please ensure that your website editor is in text mode when you paste the code.
(In Wordpress, the mode button is on the top right corner.)
  • - Allow users to view the embedded video in full-size.
Since this lesson is not free, only the preview will appear on your website.
  • Answer Engine

  • Study Guides


  • Hormones are chemical messengers that send information to all the cells in our body. Hormones transmit their chemical signals by diffusion over longer distances, and to potentially more cells, than the chemical signals of neurons.

  • Hormones coordinate the body's internal activities, from maintaining homeostasis to timing the events of complex processes like reproduction and development.

  • Important cues from the environment, such as day length and temperature, can be translated into hormonal signals that help organisms respond appropriately to environmental changes.

  • In this Lesson, we’ll investigate the advantages of broadcasting chemical signals throughout the body, as we explore the characteristics and mechanisms of hormone action. We'll finish by doing an experiment to investigate the role of hormones in insects.


Please sign in to participate in this lecture discussion.

Resetting Your Password?

Start Learning Now

Our free lessons will get you started (Adobe Flash® required).
Get immediate access to our entire library.

Membership Overview

  • Available 24/7. Unlimited Access to Our Entire Library.
  • Search and jump to exactly what you want to learn.
  • *Ask questions and get answers from the community and our teachers!
  • Practice questions with step-by-step solutions.
  • Download lecture slides for taking notes.
  • Track your course viewing progress.
  • Accessible anytime, anywhere with our Android and iOS apps.