Glencoe Health 2005.pdf

B cells b cells are lymphocytes that are stimulated

Info icon This preview shows pages 434–436. Sign up to view the full content.

View Full Document Right Arrow Icon
B CELLS B cells are lymphocytes that are stimulated to multiply when they come in contact with a pathogen. Some of the new B cells form plasma cells, which pro- duce antibodies that attack the pathogen. Other B cells form memory cells that are activated if the body is exposed to the same pathogen a second time, creating immunity. T CELLS Like B cells, T cells are lymphocytes that are stimu- lated to enlarge and multiply when they encounter a pathogen. There are two main types of T cells, killer cells and helper cells. Killer T cells stop the spread of disease within the body by releasing toxins that destroy abnormal and infected cells. Helper T cells aid in the activation of B cells and killer T cells and con- trol the body’s immune system. Lymphocytes Lymph 421 Lesson 1 The Cardiovascular System B cells and T cells For more information about how the immune system works, see Chapter 24, page 630. tonsils thymus gland lymphatic duct lymphatic vessel spleen lymphatic node lymphatic vessel
Image of page 434

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Applying Health Skills Advocacy. Research and demonstrate knowledge about personal and family health related to the cardiovascular system. Examine the effects of sedentary behavior on cardiovascular health. Create an infor- mative brochure about the relationship between an active lifestyle and a healthy heart. Share the brochure with your family. Reviewing Facts and Vocabulary 1. What are the functions of the cardiovascular system? 2. Describe the functions of arteries, capillaries, and veins. 3. Define lymph and lymphocytes. Thinking Critically 4. Comparing and Contrasting. Compare and contrast the cardiovascular and lymphatic systems. 5. Evaluating. What might swollen lymph nodes indicate? I N T E R N E T R E S O U R C E S Use informa- tion and links found at health.glencoe.com to help with your research. 422 Chapter 16 Cardiovascular and Respiratory Systems Structure of the Lymphatic System The lymphatic system consists of a network of vessels and tissues that are involved in the movement and filtering of lymph. Much like the capillaries and arterioles in the cardiovascu- lar system, small lymph vessels collect lymph and combine to form larger vessels. Lymph is moved toward the heart both by the con- traction of smooth muscles that line the walls of lymph vessels and by the contraction of sur- rounding skeletal muscles. Two large lymphatic ducts empty lymph into veins close to the heart, where it is returned to the blood. As it is moved through the body, lymph is filtered by lymph nodes, small, bean- shaped organs that are found in lymph vessels. White blood cells within lymph nodes trap and destroy foreign organisms such as bacteria and viruses to keep them from spreading throughout the body. Other structures of the lymphatic system include the spleen, thymus gland, and tonsils, all of which play a role in immunity, protecting the body from infection.
Image of page 435
Image of page 436
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern