Examlex
Which of the following is NOT part of the conducting portion of the human respiratory system?
Rounded Epithelial Structures
Refers to spherical or circular formations composed of epithelial cells, often found in glandular tissues.
Histamine
An organic nitrogenous compound involved in local immune responses, regulating physiological function in the gut, and acting as a neurotransmitter.
Vasodilation
The widening of blood vessels, which decreases blood pressure and allows for increased blood flow.
Smooth Muscle Relaxation
The process by which smooth muscles (found in the walls of internal organs and blood vessels) relax, leading to dilation of blood vessels and decreased resistance to blood flow.
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