Biology Homework Chapter 24: The Circulatory System II
Textbook assignment: Chapter 24: The Immune System, sections 12-18.
- 24.12 Helper T cells respond to the presence of recognized antigens by triggering both humoral and cell-mediated response systems which use self-protein markers to identify infected cells and invading cells.
- 24.13 Cytoxic T cells use enzymes to destroy the target cell.
- 24.14 AIDS (acquired immunodificiency syndrome) is an example of the disease which targets the immune system, leaving the victim at the mercy of normally easily-defeated infections.
- 24.15 Because HIV is a retrovirus, using reverse transcriptase to read RNA sequences to create DNA, rather than reading DNA directly, it is subject to frequent mutation, making it difficult to target for treatment.
- 24.16 Because the immune system uses self-molecule indicators (major histocompatibility complex molecules, or MHC molecules), it may reject tissues and organs implanted from other individuals.
- 24.17 Two kinds of immune system disorders can cause serious problems.
- auto immune disorders mis-identify self molecules as invading molecules.
- immunodeficiency disorders occur when the immune system response is defective or absent.
- 24.18 Allergies occur when the immune system is over-reactive to allergens, antigens that normally do not trigger immune responses in non-allergic individuals.
Read the following weblecture before chat: Specific Responses: T-Cells
Take notes on any questions you have, and be prepared to discuss the lecture in chat.
Perform the study activity below:
Work through the animation on Antigen Presentation pathways at the Stanfordf VIBE site.
- Click on each MHC type to see how it responds to antigen presence.
- What differences do you observe?
- Why is having two separate effective mechanisms useful?
Chat Preparation Activities
- Essay question: The Moodle forum for the session will assign a specific study question for you to prepare for chat. You need to read this question and post your answer before chat starts for this session.
- Mastery Exercise: The Moodle Mastery exercise for the chapter will contain sections related to our chat topic. Try to complete these before the chat starts, so that you can ask questions.
- Required: Complete the Mastery Exercise with a score of 85% or better.
- Optional: Test yourself with the textbook multiple choice questions and note any that you miss that still don't make sense. Bring questions to chat!
- Go to the Moodle and take the quiz for this chapter.
Read through the lab for this week; bring questions to chat on any aspect of the lab, whether you intend not perform it or not. If you decide to perform the lab, be sure to submit your report by the posted due date.
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