Worksheet: Human Defences Against Disease
In this worksheet, we will practice describing the physical and chemical defences of the human body.
Fill in the blanks: Pathogens are prevented from infecting our eyes by ; these contain , which break(s) down bacteria.
- Amucus, enzymes
- Btears, lysozyme
- Ctears, sulfuric acid
- Dhairs, mucus
- Ecilia, enzymes
Which of the following describes how the stomach prevents pathogens from infecting humans?
- AThe stomach produces antibiotics to break down and destroy any bacterial pathogens.
- BThe stomach compresses after eating to squash and kill any pathogens.
- CThe stomach contains acid that kills pathogens that have contaminated any food or drink a person consumes.
- DThe stomach is lined with cilia that traps pathogens and moves them down the digestive system.
- EThe stomach is lined with hairs that produce enzymes to break down pathogens.
Which of the following is an example of a physical defense against disease in humans?
- BHydrochloric acid in the stomach
- CThe skin
- DLysozyme in tears
Which of the following is an example of a chemical defense against disease in humans?
- AHydrochloric acid in the stomach
- BThe skin
- CA waxy cuticle
- DCilia in the airways
- ECell walls
Which structure prevents pathogens from entering the human respiratory system by trapping dust and microorganisms in mucus?
- CNasal hairs
- EThe stomach
Which of the following terms best describes defenses like skin, nasal hairs, and stomach acid?
Is the presence of lysozyme in tears a chemical or a physical defense?
Are nasal hairs a chemical or a physical defense?