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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
a. Releases hydrogen ions: Releasing hydrogen ions (H⁺) into the solution would lower the pH, making the solution more acidic. This is not the correct way to normalize a slightly acidic pH of 7.30.
b. Blinds hydrogen ions: This is likely a typographical error, and it should be "binds hydrogen ions." Binding hydrogen ions (H⁺) would reduce the concentration of free hydrogen ions in the solution, thereby raising the pH and making the solution less acidic. This is the correct mechanism to normalize the pH of 7.30 to a more neutral level.
c. Creates additional hydrogen ions: Creating additional hydrogen ions would further lower the pH, making the solution more acidic. This is not how a buffer system would normalize a slightly acidic pH.
d. Destroys excess hydrogen ions: While this option might seem correct, it is not typically how chemical buffer systems operate. Buffer systems usually bind (or release) hydrogen ions rather than destroy them.
Correct Answer is C
Explanation
a: Adrenal cortex and calcitonin hormone - Calcitonin is primarily secreted by the thyroid gland, not the adrenal cortex.
b: Hypothalamus and prolactin hormone - Prolactin is primarily secreted by the anterior pituitary gland, not the hypothalamus.
c. Anterior pituitary and growth hormone -The anterior pituitary gland secretes growth hormone (GH), which regulates growth, metabolism, and development.
d: Thyroid and thyroid-stimulating hormone - Thyroid-stimulating hormone (TSH) is secreted by the anterior pituitary gland, not the thyroid gland directly.
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