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Blood vessels near a wound dilate and be...

Blood vessels near a wound dilate and become more permeable in response to which material released from damaged cells?

A

pyrogens

B

antibodies

C

histamine

D

helper T cells

Text Solution

AI Generated Solution

The correct Answer is:
To answer the question about which material released from damaged cells causes blood vessels near a wound to dilate and become more permeable, we can follow these steps: ### Step-by-Step Solution: 1. **Identify the Context**: The question is about the physiological response of blood vessels near a wound. When tissues are damaged, there are specific substances that are released to initiate healing. 2. **Consider the Options**: The options provided are: - Pyrogene - Antibodies - Histamine - Helper T-cell 3. **Evaluate Each Option**: - **Pyrogene**: These substances are involved in inducing fever but do not directly affect blood vessel dilation or permeability. Thus, this option is incorrect. - **Antibodies**: These are proteins produced by the immune system to fight infections. They do not play a direct role in the immediate response to tissue injury. Therefore, this option is also incorrect. - **Histamine**: This is a chemical released by mast cells in response to injury. Histamine causes blood vessels to dilate and increases their permeability, allowing more immune cells to reach the site of injury. This is the correct option. - **Helper T-cell**: These are a type of white blood cell that plays a role in the immune response but are not directly involved in the immediate response to a wound. Thus, this option is incorrect. 4. **Conclusion**: Based on the evaluation, the substance responsible for the dilation of blood vessels and increased permeability near a wound is **Histamine**. ### Final Answer: Histamine is released from damaged cells and causes blood vessels near a wound to dilate and become more permeable. ---
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