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.
- Atears, sulfuric acid
- Bmucus, enzymes
- Chairs, mucus
- Dtears, lysozyme
- 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 is lined with cilia that traps pathogens and moves them down the digestive system.
- CThe stomach compresses after eating to squash and kill any pathogens.
- DThe stomach contains acid that kills pathogens that have contaminated any food or drink a person consumes.
- 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?
- BThe skin
- CHydrochloric acid in the stomach
- ELysozyme in tears
Which of the following is an example of a chemical defense against disease in humans?
- ACilia in the airways
- BHydrochloric acid in the stomach
- CCell walls
- DA waxy cuticle
- EThe skin
Which structure prevents pathogens from entering the human respiratory system by trapping dust and microorganisms in mucus?
- ANasal 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?
The picture shows a scab forming over a recent wound.
What component of the blood helps the blood to clot?
- AWhite blood cells
The given diagram shows cilia cells that line the trachea and other airways in the lungs. Which of the following best describes how cilia defend humans from disease?
- ACilia contain enzymes that break down the cell wall of pathogens.
- BCilia release hydrochloric acid that destroys the pathogens.
- CCilia trap pathogens in mucus and move them to the throat, then to the stomach to be destroyed.
- DCilia produce mucus that contains antibiotics that destroy bacterial cells.
- ECilia engulf the pathogens and destroy them through digestion.