What is the role of the mast cells that are found in the subcutaneous tissue?
Destroy pathogens that enter a break in the skin,
Produce histamine and leukotrienes that initiate inflammation,
Cushion bony prominences
Connect skin to muscles
The Correct Answer is B
a. Destroy pathogens that enter a break in the skin: While mast cells can contribute to the defense against pathogens by releasing inflammatory mediators, their primary function is not the direct destruction of pathogens.
b. Produce histamine and leukotrienes that initiate inflammation: This is correct. Mast cells are known for their role in releasing histamine and leukotrienes, which are key mediators of the inflammatory response.
c. Cushion bony prominences: This is not a function of mast cells. Cushioning bony prominences is a role more related to adipose tissue.
d. Connect skin to muscles: This is the function of connective tissue, not mast cells.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
a. Neutral feedback: This term is not typically used in the context of endocrine regulation.
b. Stimulating feedback: This is not a standard term in endocrine homeostasis mechanisms.
c. Negative feedback: Correct. Negative feedback is the primary mechanism by which endocrine systems maintain homeostasis. It involves reducing the output or activity of any organ or system back to its normal range of functioning.
d. Positive feedback: Positive feedback amplifies changes rather than stabilizing them, and is less common in maintaining homeostasis
Correct Answer is B
Explanation
a: Is the colored part of the eye - This describes the iris, which is the colored part of the eye that regulates the size of the pupil.
b. Located in the posterior cavity: The retina is a layer of tissue located in the posterior cavity of the eye. It contains photoreceptor cells that convert light into neural signals, which are then transmitted to the brain via the optic nerve.
c: Is the outermost layer of the eye - The outermost layer of the eye is the sclera, a tough, white layer that helps maintain the shape of the eye.
d: Produces aqueous humor - Aqueous humor is produced by the ciliary body and is found in the anterior chamber of the eye, not in the retina.
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