OCR GCSE Combined Science
Topic questions Health and disease Physical & chemical barriers
6 questions · 13 marks · about 15 minutes
Which of these is a non-specific defence mechanism of the human body against pathogens?
A Making red blood cells
B Pancreas producing insulin
C Pupil changing size
D Stomach producing acid
What traps harmful microorganisms in human lungs?
A Acid
B Hairs
C Mucus
D Plasma
HIV and TB (tuberculosis) are infectious diseases.
HIV is spread between humans during sexual intercourse when body fluids come into contact.
TB is a disease caused by bacteria. It affects the lungs.
Explain how TB is spread between humans.
Describe how the lungs defend the body against infection from TB bacteria.
The lungs can also be affected by cancer.
Complete these sentences to describe what cancer is.
Use the words in the list.
differentiated meiosis mitosis multiple undifferentiated
Cancer is the result of uncontrolled growth when cells divide by........
This may lead to millions of........ cells that are unable to become specialised.
The cells in the diagram are important for defence from pathogens in the air.
Which organ of the body are the cells found in?
A Arteries
B Brain
C Lungs
D Small intestine
The cells in the diagram are important for defence from pathogens in the air.
Which organ of the body are the cells found in?
A Arteries
B Brain
C Lungs
D Small intestine
The diagram shows tissue that lines the airways of the lungs.
This tissue has structures to help defend the body against pathogens.
What are the structures?
A Cilia and cells that make acid
B Cilia and cells that make mucus
C Nasal hairs and cells that make acid
D Nasal hairs and cells that make mucus
Memes
Laugh now. Cry in the exam hall later. Then come back and do a past paper.
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Combined Science starter pack