Figure 17 shows the number of people diagnosed with sexually transmitted infections (STIs) in the UK during 2017 - Edexcel - GCSE Biology - Question 9 - 2022 - Paper 1
Question 9
Figure 17 shows the number of people diagnosed with sexually transmitted infections (STIs) in the UK during 2017.
| sexually transmitted infection (STI) | number of... show full transcript
Worked Solution & Example Answer:Figure 17 shows the number of people diagnosed with sexually transmitted infections (STIs) in the UK during 2017 - Edexcel - GCSE Biology - Question 9 - 2022 - Paper 1
Step 1
State the sexually transmitted infection that has the median number of people diagnosed.
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Answer
The sexually transmitted infection that has the median number of people diagnosed is genital warts, which has 1.1 per 1000 of the population.
Step 2
Calculate the total number of people diagnosed with chlamydia in the UK in 2017.
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Answer
To calculate the total number of people diagnosed with chlamydia, we use the formula:
ext{Total Diagnosed} = rac{ ext{Number of diagnosed per 1000}}{1000} imes ext{Population}
State why chlamydia can be described as a communicable disease.
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Answer
Chlamydia can be described as a communicable disease because it can be transmitted from one person to another through sexual contact.
Step 4
Give one way the transmission of chlamydia can be prevented.
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One way to prevent the transmission of chlamydia is to use condoms during sexual intercourse.
Step 5
Explain why chlamydia can be treated with antibiotics.
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Chlamydia can be treated with antibiotics because it is caused by a bacterial infection. Antibiotics can target the bacteria, inhibiting their growth and reproduction, which helps to eliminate the infection from the body.
Step 6
Explain how the immune system will respond to an infection caused by bacteria.
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When a person is infected by bacteria, the immune system responds in several ways:
Detection of Antigens: Antigens from the bacteria are detected by white blood cells (WBCs).
Increase in White Blood Cells: There is an increase in the number of white blood cells, particularly lymphocytes which are critical in producing antibodies.
Production of Antibodies: The immune system produces specific antibodies that target the bacteria.
Memory Response: Some lymphocytes become memory cells that remain in the body. This allows for a faster and stronger response if the same bacteria infects the body again in the future.
These combined actions help to neutralize and destroy the pathogens.
