Question

the human biology in the news feature discusses the discovery of lymphatic vessels connecting the brain to the peripheral immune system. how does this finding challenge the traditional view of the neuroimmune system presented earlier in the text? it suggests that the neuroimmune system and peripheral immune system are more directly interconnected than previously believed to be distinct. it shows that the main cells of the neuroimmune system are lymphocytes, not glial cells. it proves that glial cells like microglia and astrocytes are not actually involved in the brains immune defense. it confirms that the blood - brain barrier is not an effective defense and allows all pathogens to enter the brain freely. an infant receives antibodies from its mothers breast milk. a year later, the same infant receives a vaccine for measles. which statement correctly classifies these two events? both are examples of active immunity. the breast milk provides passive immunity, while the vaccine provides active immunity. both are examples of passive immunity. the breast milk provides active immunity, while the vaccine provides passive immunity.

Explanation:

For the first question, the discovery of lymphatic vessels connecting the brain to the peripheral immune system shows a more direct inter - connection between the neuroimmune and peripheral immune systems than previously thought. For the second question, passive immunity is when antibodies are received from an outside source like breast milk, and active immunity is when the body's immune system is stimulated to produce its own antibodies, like with a vaccine.

Answer:

1. It suggests that the neuroimmune system and peripheral immune system are more directly interconnected than previously believed to be distinct.
2. The breast milk provides passive immunity, while the vaccine provides active immunity.