A. Cells have characteristic structures and functions that make them distinctive.
B. Processes in a cell can be classified broadly as growth, maintenance, reproduction, and homeostasis.
C. Life can be organized in a functional and structural hierarchy ranging from cells to the biosphere.
D. Most multicellular organisms are composed of organ systems whose structures reflect their particular function.
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Original Student Tutorials Science - Grades 9-12
Learn how to identify the basic functions of the immune system. You will also be able to distinguish between nonspecific and specific immune responses.
Explores how vaccines and antibiotics provide an extra level of protection from infectious agents and pathogens.
Student Resources
Original Student Tutorials
Explores how vaccines and antibiotics provide an extra level of protection from infectious agents and pathogens.
Type: Original Student Tutorial
Learn how to identify the basic functions of the immune system. You will also be able to distinguish between nonspecific and specific immune responses.
Type: Original Student Tutorial
Tutorials
A vaccine allows a person to develop acquired immunity against an illness without actually getting the disease. This interactive tutorial will help the learners to understand the process by which vaccines work in the human body.
Type: Tutorial
This Khan Academy video explains how cytotoxic t cells get activated by MHC-I antigen complexes and then proceed to kill infected cells. This video addresses the concept at a high level of complexity.
Type: Tutorial
This Khan Academy video discusses helper t cells in the immune system. The role of helper t cells in activating b cells is detailed. This challenging tutorial addresses the concept at a high level of complexity.
Type: Tutorial
This Khan Academy video describes B lymphocyte cells, and how they are activated and produce antibodies within the immune system.
Type: Tutorial
This Khan Academy video describes non specific immunity, and the specific role of phagocytes. The tutorial explains how phagocytes engulf pathogens that enter the body as a line of defense.
Type: Tutorial
This Khan Academy video contains an overview of the types of immune responses in the body. The differences between humoral adaptive immunity and cell mediated immunity are discussed in detail.
Type: Tutorial
This tutorial will help students understand how the immune system of vertebrates is characterized by acquired responses that are highly specific to particular antigens. This system has the advantage of having a cellular memory for previous infections.
Type: Tutorial
This tutorial will help you to understand how allergies develop. Allergies are exaggerated immune responses caused by B cells producing excess IgE antibodies. An allergen (food, dust) is a foreign substance, which binds to the antibodies and triggers a reaction that includes the production of histamine.
This challenging tutorial addresses the concept at a very high level of complexity.
Type: Tutorial
One of the functions of the T-Cells in the immune system is to attack and destroy infected cells. Target cells are cells that have been attacked by a virus. When the target cells have been taken over by a virus and they do not have a good chance of surviving, they trigger their own death. This action reduces the chance that other nearby cells will become infected.
This challenging tutorial addresses the concept at a high level of complexity.
Type: Tutorial
This tutorial will help you to understand the function of phagocytes. Phagocytes are specialized cells that ingest and break down foreign material including bacteria and viruses.
This challenging tutorial addresses the concept at a high level of complexity.
Type: Tutorial
T-cells perform a wide variety of functions in the immune system. In this tutorial you will understand the structure and function of the T-cells.
Type: Tutorial
All living things are made of cells. In the human body, these highly efficient units are protected by layer upon layer of defense against icky invaders like the cold virus. Shannon Stiles takes a journey into the cell, introducing the microscopic arsenal of weapons and warriors that play a role in the battle for your health.
Type: Tutorial
This short video describes the process of antibiotic resistance. Right now, you are inhabited by trillions of micro organisms. Many of these bacteria are harmless (or even helpful!), but there are a few strains of ‘super bacteria' that are pretty nasty -- and they're growing resistant to our antibiotics. Why is this happening? Kevin Wu details the evolution of this problem that presents a big challenge for the future of medicine.
Type: Tutorial