Product Details

• Format: Color, DVD, NTSC
• Language: English
• Region: Region 1 (U.S. and Canada only. Read more about DVD formats.)
  
• Aspect Ratio: 1.33:1
• Number of discs: 1
• Rated: NR (Not Rated)
• Studio: Educational Video Network, Inc.
• DVD Release Date: April 2, 2004
• Run Time: 27 minutes
• ASIN: B0002CU31M
• Amazon Best Sellers Rank: #137,090 in Movies & TV (See Top 100 in Movies & TV)

Editorial Reviews

The body’s immune system is essential for survival. Learn how it defends us against foreign substances, such as bacteria, fungi, viruses, protozoa, parasites, potentially toxic cells, or abnormal cells. The immune system attacks invaders, or antigens, and maintains a memory of doing so, thereby enabling it to respond more quickly and with greater strength if the body is ever exposed to the same threat again. Understand what antibodies are and learn how they’re produced. Immunodeficiency and autoimmune diseases are discussed, so students will know what happens when the immune system does not function as it should.