Diagram how an antigen can only bind to a specific receptor, due to the specific shape of the receptor protein. The binding is the next step in the process which started due to a stimulus which caused the message to be produced. Illustrate the "lock and key" utilizing snap blocks. Using a pathogen antigen as an example, list the steps which occur in the process to neutralize and kell the pathogen. Define and differentiate between specificity and affinity.

Explain that receptors are specific proteins whose function is to receive chemical signals from outside the cell. Once received, the messenger signal sets up a cell-tissue-organ response which is a change in the electrical conductivity of the cell. The response can be an increase in capillary permeability, itching, vasodilation, an inflammatory response, increase in heart rate, increase in blood pressure, and when severe, anaphylaxis. Discuss the minimum receptor binding required for a response to occur.

During today’s session, we have started working on a new chapter. In this chapter, we will study the nervous system. We have started with the nervous system anatomy and Lena took notes from the lecture.

I missed you today. I hope you have a wonderful break.

Test on skeletal system... Start of a discussion on why and how cells must communicate with each other to maintain homeostasis. What is an endogenous chemical messenger, its function, and how does it react with a specific cellular receptor?

Chapter summary as review for chapter test. Discussion included on each diagram used.

I missed Lena today. I hope she has a good break and I look forward to seeing her soon.

Read and discuss all parts of the chapter summary review at the end of the chapter as preparation for test tomorrow

During today's session, Lena completed two activities where she had to apply all the concepts that we have been working on during the last few weeks.

Outline what occurs within the structure of bone as the aging process proceeds. More calcium is leeched into the blood than reabsorbed into bone, the matrix thins, the bone becomes more brittle. Discuss this leads to spontaneous fractures, and view the different types of fractures. Show x rays of a knee joint which indicates an inflammation of the joint. Explain this as being a form of arthritis. Discuss the 2 types of arthritis, osteoarthritis and rheumatoid arthritis. Indicate that RA is an autoimmune disease which may be triggered by a bacterial or viral infection. Discuss and outline the available treatment protocols used to treat both types.