1 The diagram shows a sample of human blood - Edexcel - GCSE Biology - Question 1 - 2017 - Paper 1
Question 1
1 The diagram shows a sample of human blood.
(a) The table shows the minimum and maximum numbers of each type of cell in 1mm³ of human blood.
| human blood cells ... show full transcript
Worked Solution & Example Answer:1 The diagram shows a sample of human blood - Edexcel - GCSE Biology - Question 1 - 2017 - Paper 1
Step 1
State the most common type of cell in human blood.
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Answer
The most common type of cell in human blood is red blood cells.
Step 2
Explain why the number of blood cells will change if a person has a bacterial infection.
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Answer
During a bacterial infection, the immune system responds by increasing the number of white blood cells (leukocytes). These white blood cells, including phagocytes and lymphocytes, work to defend the body against the invading bacteria by engulfing them or producing antibodies.
Step 3
Complete the sentence by putting a cross (✗) in the box next to your answer.
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Answer
☑ A problems clotting blood if they are cut
Step 4
Describe the function of the liquid part of the blood.
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Answer
The liquid part of the blood, known as plasma, serves several essential functions. It transports nutrients, hormones, and proteins throughout the body and carries waste products to the kidneys and liver for detoxification. Plasma also helps maintain blood pressure and volume and plays a crucial role in the immune response.
Step 5
State one similarity between adult stem cells and embryonic stem cells.
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Answer
Both adult and embryonic stem cells can divide indefinitely and have the capability to differentiate into various specialized cell types.
Step 6
State one difference between adult stem cells and embryonic stem cells.
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Answer
Embryonic stem cells are totipotent, meaning they can develop into any type of body cell, whereas adult stem cells are multipotent and can only develop into a limited range of cell types.
