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Neutrophils - secrete complement proteins - VCE - SSCE Biology - Question 15 - 2021 - Paper 1
Question 15
Neutrophils - secrete complement proteins. - migrate to the site of infection and engulf invading pathogens. - increase the diameter of blood vessels to make them m... show full transcript
Worked Solution & Example Answer:Neutrophils - secrete complement proteins - VCE - SSCE Biology - Question 15 - 2021 - Paper 1
Step 1
Step 2
migrate to the site of infection and engulf invading pathogens
Answer
Upon detecting signals from infected or damaged tissues, neutrophils migrate to the site of infection through a process called chemotaxis. Once at the site, they engulf and digest invading pathogens through phagocytosis.
Step 3
increase the diameter of blood vessels to make them more permeable
Answer
Neutrophils can release signaling molecules that lead to vasodilation, increasing the diameter of blood vessels. This process enhances blood flow to the affected area and allows more immune cells to reach the site of infection.
Step 4
release histamine following the binding of the antigen to receptors on the neutrophil’s surface
Answer
Following the recognition of antigens, neutrophils can release histamine, which is a key player in inflammatory responses. Histamine increases vascular permeability, allowing other immune cells to infiltrate the infected tissue more effectively.