NEET MDS Shorts
530064
PhysiologyAnswer: 2) Dilatation (bronchodilatation)Explanation: Epinephrine acts on beta-2 adrenergic receptors in the bronchial smooth muscles, leading to their relaxation and dilatation of the bronchioles. This allows for increased airflow and oxygenation of the lungs, which is essential during the fight-or-flight response.
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Orthodonticswe are applying force distally only..force vector will rotate the tooth distally
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OrthodonticsSolution
This is because elastic supracrestal fibres remodel extremely slowly and can still exert forces capable of displacing a tooth even at 1 year after removal of an orthodontic appliance.
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Oral and Maxillofacial SurgeryDistoangular impactions require significant bone removal, which can
weaken the ramus and make it prone to fracture. This is because the tooth is
angled towards the rear and the side of the jaw, making it difficult to extract
without damaging the surrounding bone.
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PhysiologyThe conversion of 7-dehydrocholesterol to cholecalciferol (vitamin D3) in the skin is initiated by the action of UVB light from sunlight, not by any specific hormone.
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Orthodontics
Explanation: The philtrum is the vertical groove located in the middle of the upper lip. It is primarily formed by the fusion of the medial nasal processes, which include the globular process. The globular process is a key structure in the embryonic development of the face, contributing to the formation of the upper lip and the philtrum.
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PhysiologySpermatogenesis occurs in the seminiferous tubules of the male reproductive system, where sperm cells are produced and matured.
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RadiologyWhich of the following helps in distinguishing an osseous neoplasm and a cyst on an X-ray: peripheral bone formation.