In this lesson our instructor talks about the immune system. First she discusses the lymphatic system, barrier defenses, nonspecific cellular defenses, specific defenses, B cells, and Clonal selection. Then she talks about major histocompatibility complex molecules, helper T cells, mechanisms of antibody action, and classes of antibodies. Lastly, she lectures on passive immunity, active immunity, recognition of self and non-self, and immunodeficiency. Four complete example videos round up this lesson.
The first line of defense is
barrier to entry. The skin, mucus membranes and tears are barrier
The second line of defense
includes nonspecific cellular defenses such as neutrophils,
macrophages and natural killer cells. Proteins such as complement
and interferon also play a role in nonspecific defense.
B cells are produced and mature
in the bone marrow. B cells are responsible for humoral immunity,
which is mediated by antibodies secreted by plasma cells.
mature in the thymus and are responsible for cell-mediated immunity.
Cytotoxic T cells destroy cells
that are infected by a pathogen or that are abnormal.
Helper T cells assist in
activating the production of antibodies by B cells and by
stimulating cytotoxic T cells.
Antigens are presented to T
cells by Major Histocompatibility Complex (MHC) Molecules on the
surface of cells.
Passive immunity is conferred
when an individual is given pre-formed antibodies. Active immunity
requires the stimulation of a person's own immune system.
The Immune System
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
The book and CD package include three full length practice exams that are presented with all questions answered and explained. The author also presents detailed reviews of all test topics and includes multiple-choice and free-response questions with answers at the end of each topic's chapter.
This book has a great topic-by topic breakdown of the 14 must-know principles with sample questions and answers for each of the subjects. Laboratory Review includes a focused review of all 12 AP laboratory exercises. Included in this is 2 full length practice tests that stimulate the actual test along with answers and complete explanations.
This book includes a comprehensive biology test topic review, covering everything from photosynthesis to genetics to evolution. Cracking the AP Biology also includes testing strategies for the grid-in and essay section, great guidance on writing a high-scoring essay, and two full length practice exams with detailed explanations.