Final answer:
Normal age-related changes for the immune and lymphatic systems include weakening of the immune system, an increase in the number of T-cells, and an increased response to vaccines.
Step-by-step explanation:
Normal age-related changes for the immune and lymphatic systems include:
- Immune system weakens: As people get older, their immune system naturally becomes less effective, making them more susceptible to disease. This age-related decline in immune function is called immunosenescence.
- T-cells increase in number: T cells are a type of white blood cell that play a key role in the immune response. While the overall function of the immune system may decline with age, the number of T cells actually increases.
- Response to vaccines increases: The immune response to vaccines can become stronger in older individuals. This is why certain vaccines, such as the flu vaccine, are recommended for seniors.