NEET MDS Shorts
44828
Oral SurgeryPenicillin is most effective against gram-positive bacteria due to the structure of their cell walls. Gram-positive bacteria have a thick peptidoglycan layer that is easily targeted by penicillin, which inhibits the synthesis of this essential cell wall component.
60674
Physiology
The epithelial cells of the villi in the small intestine contain various digestive enzymes and microvilli that increase the surface area for nutrient absorption. These cells are crucial for the final stages of digesting carbohydrates and proteins, as well as for the absorption of nutrients.
41123
Pharmacology
Acute intermittent prophyria (AIP) : Barbiturates exacerbate it by inducing microsomal enzymes and d amino levulinic acid synthetase and increasing prophyrin synthesis. Note: Contraindications of barbiturates : · Liver and kidney disease · Severe pulmonary insufficiency eg. Emphysema · Obstructive sleep apnoea
23022
PedodonticsLateral food impaction occurs mainly due to open proximal contact.
21978
Pharmacology
Withdrawal of morphine is associated with marked drug-seeking behavior.
Physical manifestations of abstinence are - lacrimation, sweating, yawning, anxiety, fear, restlessness, gooseflesh, mydriasis, tremor, insomnia, abdominal colic, diarrhea, dehydration, rise in BP, palpitation and rapid weight loss.
Delirium and convulsions are not a characteristic feature (contrast barbiturates) and are seen only occasionally.
Cardi-ovascular collapse and fatality are rare if supportive measures are instituted.
26548
Physiology
The intestinal phase of gastric acid secretion is mainly responsible for inhibiting gastric secretion. This is primarily achieved through the release of hormones like secretin and cholecystokinin (CCK) in response to the presence of acidic chyme in the duodenum. These hormones act on D cells in the stomach to reduce gastrin secretion, which in turn decreases acid production by parietal cells. Additionally, the presence of food in the intestine triggers an enterogastric reflex that inhibits the vagal nerve's excitatory effects on the stomach.
45317
MedicineA solitary pulmonary nodule (SPN) is a single, small, well-defined lesion in the lung. The investigation of choice for evaluating an SPN is a computed tomography (CT) scan.
87733
NEETMDS
Scorbutic rosary refers to the sharp, angular prominence of the costochondral junctions seen in scurvy (vitamin C deficiency). This is distinct from the blunter, rounded enlargement seen in rickets.
51229
PathologyCells die by one of two mechanisms – necrosis or apoptosis • Two physiologically different processes – Necrosis – death by injury – Apoptosis – death by suicide Appoptosis: Disintegration of cells into membrane-bound particles that are then eliminated by phagocytosis or by shedding.
93815
PeriodonticsA contraindication for distal wedge removal for periodontal surgery in the mandibular molar area is insufficient space between the distal molar and ascending ramus.