Identify component F.
Identify one virus component that is not shown in Fig. 2.1.
Pathogens may reach humans either by direct contact or indirectly. List two of the human body's barriers to pathogen entry.
If a virus can get through the body's barriers, an immune response occurs. Antibodies are produced during this immune response. Name four chemical elements that will always be present in an antibody molecule.
Explain how the structure and function of an antibody molecule are important in an immune response.
Suggest why babies born prematurely are more likely to develop some infectious diseases than babies born after 40 weeks of pregnancy.
Suggest one action that a mother can take to protect her premature baby from infection in the weeks after birth.