When you have an infection, what causes the fever?A. The infective agent stimulates the heart to beat faster.B. The infective agent impairs the activity of the hypothalamus.C. The immune system delivers prostaglandins and histamine to the hypothalamus.D. The immune system decreases blood flow to the brain.

The immune system develops                  through exposure to               .     A. infections; antibodies     B. blobs; antibodies   C. antibodies;  B-lymphocytes     D. antigens; antibodies     E. antibodies; antigens

Select all of the organ systems that are directly part of our immune system? A. Skeletal System B. Muscular System C. Digestive System D. Respiratory System E. Circulatory System F. Lymphatic System G. Immune System H. Excretory System I. Endocrine System J. Nervous System K. Integumentary System L. Reproductive System

Select the incorrect statement regarding the temperature of the immune system. A. Interleukin-1 is a pyrogen, which can cause the neurons in the hypothalamus to raise the body's temperature, producing a fever. B. Fevers cause the liver and spleen to store sodium and potassium which bacteria need for their growth and metabolism. C. Fevers above 105∘∘F can be fatal. D. Fever contributes to the body's defense by stimulating phagocytosis E. When macrophages encounter invading cells, they release interleukin-1, which is carried to the brain by the circulatory system.