Checkpoint: What are the three main functions of the lymphatic system?

How does the body protect us from pathogens? Learning Intention: I can explain the basic functions of the immune system.

How viruses invade your body https://www.youtube.com/watch?v=Rpj0emEGShQ&t=32s

Influenza Virus Someone at the school has a cold. They feel tired. They are constantly sneezing, have a runny nose, and a fever.

Influenza Virus The student’s body is trying to get ride of the virus and produces thick mucus in their lungs causing the student to cough and release the influenza virus into the environment.

Influenza Virus The virus spreads through the air and lands on neighboring host (you, another student). Your non-specific immune system protects you from the virus. Your skin!

Non-specific immune defense Your skin is a physical barrier that keeps pathogens from entering the body. As well, sweat and natural body acids kills some pathogens on the surface of the skin.

Non-specific immune defense The virus spread through the air and you breath in the virus into your lungs. Here your 2nd immune defense steps in. The mucus membrane on your lungs traps the virus. The special structure on your lungs called cilia sweep the mucus and the virus out of your lungs causing you to cough. Some the this mucus is spread to the outside environment, while some is swallowed and enters your stomach.

Non-specific immune defense In your stomach, the digestive system can help stop you from getting sick. Strong acids in you stomach kill many types of pathogens.

Invading your body While in class you have an itchy eye and with your hand that has the Influence virus on the surface of the skin you rub your eye. The virus enters your body and travels in your blood stream.

Your immune system is ready to attack The virus has passed the first line of defense and has entered the body. In effort to kill the virus your body strikes a fever and non-specific immune cells attack the virus in attempt to protect you. Macrophages and Killer Cells

Specific Immunity Your body ID’s the virus through specific structures (called antigens) located on the surface of the virus. Your immune system makes specific cells to attack the virus. These cells are called B lymphocytes and T lymphocytes .

Specific Immunity B cells make antibodies. Antibodies will bind to antigens on the surface of the virus, so the immune system knows to kill those cells.

Specific Immunity T cells help kill the pathogens by attacking cells that are infected with the virus. T cells also help remember the virus that made you sick.

All Systems Are A Go Your body’s immune system works hard to attack the virus. It takes a few days but your body is able to kill the virus and make specific antibodies and memory T cells that help protect you from the same virus in the future. You recover from the virus invasion, however during the three days that you were sick you spread the virus to another host. The virus lives on finding a new host to thrive in! Check for Understanding Students Discuss Before moving on to immune system overview

Vaccines: How do they work? https://www.youtube.com/watch?v=rb7TVW77ZCs

Monday, April 16th Quiz Differentiate between pulmonary and systemic circulation with respect to oxygenation and deoxygenation of blood in the vessels involved. Demonstrate a knowledge of the path of a blood cell from the aorta through the body and back to the left ventricle. Describe capillary-tissue fluid exchange. Identify and describe differences in structure and circulation between fetal and adult systems, with reference to the umbilical vein and arteries, oval opening, venous duct, and arteriole duct. Describe the shape and function of red blood cells, white blood cells, and platelets. List the major components of blood plasma. Explain the roles of antigens and antibodies. Describe the functions of the lymphatic system.

Exit Slip Write 3 challenging short or long answer questions with the answer for the following topics, components of blood, fetal circulation, and the lymphatic system.