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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Related Questions
Correct Answer is D
Explanation
a. Decrease in sodium reabsorption: This would lead to further lowering of blood pressure, which is not a compensatory response.
b. Dilation of the afferent arteriole: This typically increases glomerular filtration rate but is not a primary response to decreased blood pressure.
c. Constriction of the efferent arteriole: This response helps to increase glomerular pressure but is secondary to other mechanisms.
d. Release of renin: Renin is released by the kidneys in response to low blood pressure, initiating the renin-angiotensin-aldosterone system (RAAS) to increase blood pressure by conserving sodium and water and constricting blood vessels.
Correct Answer is B
Explanation
a. Splenic flexure: This is the bend between the transverse and descending colon on the left side, also known as the left colic flexure.
b. Right colic flexure: The hepatic flexure, also known as the right colic flexure, is the bend between the ascending and transverse colon near the liver.
c. Pontine flexure: This refers to a bend in the developing brainstem, not the colon.
d. Left colic flexure: This is another name for the splenic flexure, not the hepatic flexure.
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