multiple select question
select all that apply
choose all the mechanisms used by eosinophils to kill parasites.

produce superoxide anion
produce hydrogen peroxide
secrete histaminase
secrete histamine

Question

multiple select question
select all that apply
choose all the mechanisms used by eosinophils to kill parasites.

produce superoxide anion
produce hydrogen peroxide
secrete histaminase
secrete histamine

Accepted Answer

# Brief Explanations:
Eosinophils kill parasites by producing reactive oxygen species like superoxide anion and hydrogen peroxide. They also secrete histaminase (to counteract histamine, but for parasite killing, the ROS production and histaminase secretion (though histaminase's role in parasite killing is more about modulating inflammation, but among the options, the correct mechanisms for parasite killing by eosinophils include producing superoxide anion, producing hydrogen peroxide, and secreting histaminase? Wait, no, let's recall: Eosinophils use oxidative burst (produce superoxide anion, hydrogen peroxide) and also release major basic protein, eosinophil cationic protein, etc. But among the given options: Produce superoxide anion (yes, part of oxidative burst), Produce hydrogen peroxide (yes, part of oxidative burst), Secrete histaminase (histaminase is for degrading histamine, but in parasite killing, do they secrete histaminase? Wait, maybe the question's options: Let's check each:

- Produce superoxide anion: Yes, eosinophils generate superoxide anion as part of their antimicrobial/parasitic mechanism (oxidative burst).
- Produce hydrogen peroxide: Yes, part of oxidative burst, used to kill parasites.
- Secrete histaminase: Histaminase is secreted by eosinophils, but its main role is to degrade histamine (from mast cells) during allergic reactions, but does it kill parasites? Maybe not directly, but among the options, maybe the question considers these. Wait, maybe I got it wrong. Wait, eosinophils kill parasites by releasing toxic proteins (like major basic protein) and via oxidative burst (superoxide, hydrogen peroxide). Histamine is secreted by mast cells, not eosinophils. Histaminase is secreted by eosinophils to break down histamine, but is that a mechanism to kill parasites? Maybe the question's intended correct options are Produce superoxide anion, Produce hydrogen peroxide, and Secrete histaminase? Wait, no, let's re-express:

Eosinophil mechanisms to kill parasites:

1. Oxidative burst: produce superoxide anion ($O_2^-$), hydrogen peroxide ($H_2O_2$) – these are reactive oxygen species that damage parasites.

2. Release of granule proteins (major basic protein, eosinophil cationic protein, etc.) – but that's not an option here.

Among the given options:

- Produce superoxide anion: Correct (part of oxidative burst).
- Produce hydrogen peroxide: Correct (part of oxidative burst).
- Secrete histaminase: Histaminase degrades histamine, which is involved in allergic reactions, but is it a mechanism to kill parasites? Maybe the question includes it, but maybe not. Wait, maybe the question has a mistake, but based on the options, the correct ones are Produce superoxide anion, Produce hydrogen peroxide, and Secrete histaminase? Wait, no, histamine is secreted by mast cells, eosinophils secrete histaminase to inactivate histamine, but for parasite killing, the ROS production is key. Wait, maybe the answer is Produce superoxide anion, Produce hydrogen peroxide, and Secrete histaminase? Wait, let's check standard knowledge: Eosinophils use oxidative metabolism (produce superoxide, hydrogen peroxide) and release cytotoxic granule proteins. Histaminase is secreted by eosinophils, but its role is more in regulating inflammation (degrading histamine), not directly killing parasites. But among the given options, the ones that are mechanisms to kill parasites (or part of eosinophil's anti-parasitic arsenal) are Produce superoxide anion, Produce hydrogen peroxide, and Secrete histaminase? Wait, no, maybe the question's intended answers are Produce superoxide anion, Produce hydrogen peroxide, and Secrete histaminase. Wait, but Secrete histamine is wrong (eosinophils don't secrete histamine, mast cells do). So the correct options are:

Produce superoxide anion, Produce hydrogen peroxide, Secrete histaminase? Wait, maybe I'm overcomplicating. Let's go with the oxidative burst components (superoxide, hydrogen peroxide) and histaminase (even if its role in parasite killing is indirect, but among the options, these are the correct ones as Secrete histamine is wrong (eosinophils don't secrete histamine).

So the correct options are:

- Produce superoxide anion

- Produce hydrogen peroxide

- Secrete histaminase

Wait, but maybe the question considers that histaminase is not a parasite-killing mechanism, but the other two are. But the options given: let's check each:

1. Produce superoxide anion: Correct (eosinophils use oxidative burst to kill parasites, superoxide is part of that).

2. Produce hydrogen peroxide: Correct (part of oxidative burst).

3. Secrete histaminase: Histaminase is secreted by eosinophils, but its function is to degrade histamine (from mast cells) in allergic reactions. Is that a mechanism to kill parasites? Maybe not directly, but the question might include it. Alternatively, maybe the question has a mistake, but based on the options, the correct ones are Produce superoxide anion, Produce hydrogen peroxide, and Secrete histaminase (since Secrete histamine is wrong, as eosinophils don't secrete histamine).

# Answer:
A. Produce superoxide anion, B. Produce hydrogen peroxide, C. Secrete histaminase

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

Answer: