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Q5. While learning to ride a bicycle, Boojho lost his balance and fell. He got
bruises on his knees and it started bleeding. However, the bleeding
stopped after sometime.
(a) Why did the bleeding stop?
(b) What would be the colour of the wounded area and why?
(c) Which type of blood cells are responsible for clotting of blood?
bruises on his knees and it started bleeding. However, the bleeding
stopped after sometime.
(a) Why did the bleeding stop?
(b) What would be the colour of the wounded area and why?
(c) Which type of blood cells are responsible for clotting of blood?
Most Upvoted Answer
Q5. While learning to ride a bicycle, Boojho lost his balance and fell...
Why Did the Bleeding Stop?
The bleeding from Boojho's knee stopped due to a natural process called hemostasis. This process involves several steps:
- Vasoconstriction: Blood vessels constrict to reduce blood flow to the injured area.
- Platelet Plug Formation: Platelets, a type of blood cell, rush to the site of injury and stick together, forming a temporary plug.
- Clot Formation: A cascade of chemical reactions leads to the formation of fibrin, a protein that reinforces the platelet plug, solidifying it into a stable clot.
Colour of the Wounded Area
The color of the wounded area typically changes due to several factors:
- Redness: Initially, the area may appear red due to increased blood flow and inflammation.
- Bruising: If there’s damage to blood vessels, blood may leak into surrounding tissues, creating a bruise that can appear purple or blue.
- Healing: As healing progresses, the color will gradually change, often turning yellow or green before returning to normal skin color.
Blood Cells Responsible for Clotting
The primary blood cells responsible for clotting are called platelets. Here’s how they contribute:
- Formation: Platelets are small, disc-shaped cell fragments produced in the bone marrow.
- Function: When a blood vessel is damaged, platelets adhere to the injury site and each other, forming a plug.
- Chemical Signals: They release chemical signals that attract more platelets, amplifying the response and stabilizing the clot.
Overall, platelets play a crucial role in preventing excessive bleeding and facilitating the healing process.
The bleeding from Boojho's knee stopped due to a natural process called hemostasis. This process involves several steps:
- Vasoconstriction: Blood vessels constrict to reduce blood flow to the injured area.
- Platelet Plug Formation: Platelets, a type of blood cell, rush to the site of injury and stick together, forming a temporary plug.
- Clot Formation: A cascade of chemical reactions leads to the formation of fibrin, a protein that reinforces the platelet plug, solidifying it into a stable clot.
Colour of the Wounded Area
The color of the wounded area typically changes due to several factors:
- Redness: Initially, the area may appear red due to increased blood flow and inflammation.
- Bruising: If there’s damage to blood vessels, blood may leak into surrounding tissues, creating a bruise that can appear purple or blue.
- Healing: As healing progresses, the color will gradually change, often turning yellow or green before returning to normal skin color.
Blood Cells Responsible for Clotting
The primary blood cells responsible for clotting are called platelets. Here’s how they contribute:
- Formation: Platelets are small, disc-shaped cell fragments produced in the bone marrow.
- Function: When a blood vessel is damaged, platelets adhere to the injury site and each other, forming a plug.
- Chemical Signals: They release chemical signals that attract more platelets, amplifying the response and stabilizing the clot.
Overall, platelets play a crucial role in preventing excessive bleeding and facilitating the healing process.
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Q5. While learning to ride a bicycle, Boojho lost his balance and fell. He got bruises on his knees and it started bleeding. However, the bleeding stopped after sometime. (a) Why did the bleeding stop? (b) What would be the colour of the wounded area and why? (c) Which type of blood cells are responsible for clotting of blood?
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Q5. While learning to ride a bicycle, Boojho lost his balance and fell. He got bruises on his knees and it started bleeding. However, the bleeding stopped after sometime. (a) Why did the bleeding stop? (b) What would be the colour of the wounded area and why? (c) Which type of blood cells are responsible for clotting of blood? for Class 7 2024 is part of Class 7 preparation. The Question and answers have been prepared according to the Class 7 exam syllabus. Information about Q5. While learning to ride a bicycle, Boojho lost his balance and fell. He got bruises on his knees and it started bleeding. However, the bleeding stopped after sometime. (a) Why did the bleeding stop? (b) What would be the colour of the wounded area and why? (c) Which type of blood cells are responsible for clotting of blood? covers all topics & solutions for Class 7 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Q5. While learning to ride a bicycle, Boojho lost his balance and fell. He got bruises on his knees and it started bleeding. However, the bleeding stopped after sometime. (a) Why did the bleeding stop? (b) What would be the colour of the wounded area and why? (c) Which type of blood cells are responsible for clotting of blood?.
Q5. While learning to ride a bicycle, Boojho lost his balance and fell. He got bruises on his knees and it started bleeding. However, the bleeding stopped after sometime. (a) Why did the bleeding stop? (b) What would be the colour of the wounded area and why? (c) Which type of blood cells are responsible for clotting of blood? for Class 7 2024 is part of Class 7 preparation. The Question and answers have been prepared according to the Class 7 exam syllabus. Information about Q5. While learning to ride a bicycle, Boojho lost his balance and fell. He got bruises on his knees and it started bleeding. However, the bleeding stopped after sometime. (a) Why did the bleeding stop? (b) What would be the colour of the wounded area and why? (c) Which type of blood cells are responsible for clotting of blood? covers all topics & solutions for Class 7 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Q5. While learning to ride a bicycle, Boojho lost his balance and fell. He got bruises on his knees and it started bleeding. However, the bleeding stopped after sometime. (a) Why did the bleeding stop? (b) What would be the colour of the wounded area and why? (c) Which type of blood cells are responsible for clotting of blood?.
Solutions for Q5. While learning to ride a bicycle, Boojho lost his balance and fell. He got bruises on his knees and it started bleeding. However, the bleeding stopped after sometime. (a) Why did the bleeding stop? (b) What would be the colour of the wounded area and why? (c) Which type of blood cells are responsible for clotting of blood? in English & in Hindi are available as part of our courses for Class 7.
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Here you can find the meaning of Q5. While learning to ride a bicycle, Boojho lost his balance and fell. He got bruises on his knees and it started bleeding. However, the bleeding stopped after sometime. (a) Why did the bleeding stop? (b) What would be the colour of the wounded area and why? (c) Which type of blood cells are responsible for clotting of blood? defined & explained in the simplest way possible. Besides giving the explanation of
Q5. While learning to ride a bicycle, Boojho lost his balance and fell. He got bruises on his knees and it started bleeding. However, the bleeding stopped after sometime. (a) Why did the bleeding stop? (b) What would be the colour of the wounded area and why? (c) Which type of blood cells are responsible for clotting of blood?, a detailed solution for Q5. While learning to ride a bicycle, Boojho lost his balance and fell. He got bruises on his knees and it started bleeding. However, the bleeding stopped after sometime. (a) Why did the bleeding stop? (b) What would be the colour of the wounded area and why? (c) Which type of blood cells are responsible for clotting of blood? has been provided alongside types of Q5. While learning to ride a bicycle, Boojho lost his balance and fell. He got bruises on his knees and it started bleeding. However, the bleeding stopped after sometime. (a) Why did the bleeding stop? (b) What would be the colour of the wounded area and why? (c) Which type of blood cells are responsible for clotting of blood? theory, EduRev gives you an
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