Describe cellular and humoral immune responses. How are they different from each other? Give...

This lesson will teach you about certain white blood cells of the innate immune system. Namely, we'll learn about phagocytes, monocytes, macrophages, mast cells, and NK cells.

This lesson delves into something known as type I hypersensitivity reactions. You'll find out how everything from mast cells, basophils, and IgE to histamine, bee stings, and peanut allergies all play a role in this process.

This lesson will teach about the birth, maturation, and importance of T cells. You'll learn about T lymphocytes, cytotoxic T cells, helper T cells, memory T cells, and more!

Your immune system protects you from foreign invaders that might harm you. When your immune system responds to these threats, it's called an immune response. Learn about two arms of immunity known as antibody-mediated and cell-mediated immunity.

This lesson will cover something known as the complement system. We'll delve into the key functions of this system, including opsonization, chemotaxis, and the formation of membrane attack complexes.

This lesson will help you distinguish between several different types of immunity. This includes passive immunity, active immunity, naturally acquired immunity and artificially acquired immunity.

The inflammatory response is a part of your innate immune system that responds to infection and injury. In this video, you'll learn about the process of inflammation and what happens when it becomes chronic.

In this lesson, we'll cover both the primary and secondary organs of the immune system. Specifically, we'll look at the function of each and how they work together throughout our life to protect our body against invaders.

Antigen-presenting cells (APCs) help start the body's immune response against infection by finding and activating T cells. This lesson will discuss how the APCs do this, and how the T cells respond.

Have you ever wondered why some people don't ever seem to get sick? These people likely have an acquired immunity. Learn more about the immune system and how exposure to an illness one time can help your body to prevent that illness from ever occurring again.

This lesson will talk about how bacteria, viruses, and parasites may contribute to or directly cause injuries and death to cells, organs, and the entire body. We will discuss exotoxins, endotoxins, and much more.

Skeletal muscle contraction causes all types of movement. Movement at our joints is referred to as articulation. All articulation is described in reference to the anatomical position, and most articulations are identified in opposite pairs. This lesson identifies and describes the major articulations of the human body.

This lesson will teach you about the immune system, what immune deficiency means, why that's dangerous, and about the important causes of such a problem, including HIV/AIDS, SCID, CVID, and more.

During middle adulthood, many people find that their family dynamics change. In this lesson, we'll look at some of these changes, like becoming a grandparent and the challenges faced when a person is taking care of both their kids and parents.

What is an autoimmune disease? Why does it occur? What are some examples of autoimmune diseases? This lesson will describe myasthenia gravis, multiple sclerosis, type 1 diabetes, and much more.

Antigens are invaders that sneak into our bodies and can possibly cause us harm; however, they trigger our immune system, which fights them off. This lesson explains antigens and some of the processes that go along with them.