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Injured cells release a substance for di...

Injured cells release a substance for dilation of blood vessels and increase the permeability of their walls so that the healing materials can be transported to the site of wound. This substance is

A

Histamine

B

Dopamine

C

Angiotensinogen

D

Pyrogen

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Question**: The question states that injured cells release a substance that causes dilation of blood vessels and increases their permeability to facilitate the transport of healing materials to the wound site. 2. **Identifying the Options**: The options provided are: - A) Histamine - B) Dopamine - C) Angiotensinogen - D) Pyrogen 3. **Analyzing Each Option**: - **Histamine**: This is a compound released by mast cells during an injury. It causes blood vessels to dilate (widen) and increases the permeability of their walls, allowing healing materials to reach the injury site. - **Dopamine**: This is a neurotransmitter that primarily functions in the brain. It is involved in signaling and does not play a role in dilating blood vessels or increasing permeability in the context of injury. - **Angiotensinogen**: This is a precursor to angiotensin, which causes blood vessels to constrict (narrow) and is involved in regulating blood pressure. It does not promote dilation or increased permeability. - **Pyrogen**: This is a substance that induces fever by raising body temperature in response to infection. It does not have a direct role in the dilation of blood vessels or permeability. 4. **Conclusion**: Based on the analysis, the substance released by injured cells that causes dilation of blood vessels and increases their permeability is **Histamine**. 5. **Final Answer**: The correct answer is **A) Histamine**. ---
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TRUEMEN BIOLOGY ENGLISH-HUMAN HEALTH AND DISEASE-MULTIPLE CHOICE QUESTIONS
  1. Select the wrong statement

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  2. Select the correct match

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  3. Injured cells release a substance for dilation of blood vessels and in...

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  4. Go through the following matches Which of these are correct ?

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  5. The sporozoites that cause infection, when a female Anopheles mosquito...

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  6. Many diseases can be diagnosed by observing the symptoms in the patien...

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  7. In malignant tumors, the cells proliferate, grow rapidly and move to o...

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  8. The substance produced by a cell in viral infection that can protect o...

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  9. Transplantation of tissues/organs to save certain patients often fails...

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  10. Antibodies present in colostrum which protect the new born from certai...

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  11. Antivenom against snake poison contains

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  12. Which of the following glands is large sized at birth but reduces in s...

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  13. Haemozoin is a

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  14. A person with sickle cell anaemia is

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  15. Assertion (A): Many visitors to the hills suffer from skin and respira...

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  16. Assertion: Tapeworm, roundworm and pinworm are endoparasites of human ...

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  17. Which institute is correctly matched with its location?

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  18. A young drug addict used to show symptoms of depressed brain activity,...

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  19. Assertion (A): Organ transplantation patients are given immunosuppress...

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  20. Assertion (A): A person who has received a cut and is bleeding needs t...

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