Dentosphere : World of Dentistry

# At higher CO2 concentration, oxygen dissociation curve of hemoglobin will: A. Move to left B. Move to right C. Become irregular D. Move upwardly The correct answer is B. Move to right Right shift of the curve (decreased affinity of Hb for Oxygen) is caused by the following factors: - High PCO2 - Low blood pH - High body temperature - Increased level of 2,3 DPG (Diphosphorylglycerate or biphosphoglycerate)

# Pneumotaxic center related to respiration is located in: A. Crura Cerebri B. Medulla Oblongata C. Pons Varoli D. Parietal lobe The correct answer is C. Pons varoli. 

# In reference to the Spaulding Classification System for contaminated items, semi critical items should be reprocessed by: A. Immersion in a tuberculocidal disinfectant B. Heat sterilization if the material is heat stable C. Washing with a chlorhexidine gluconate solution D. A spray-wipe-spray technique The correct answer is B. heat sterilization if the material is heat stable. Semi critical items are defined as instruments that do not penetrate soft tissues or bone but are used inside the mouth and contact the mucosa. These instruments must be sterilized after every use or must undergo high level disinfection if they are not heat stable.

# Which of the following types of gloves should be utilized to provide the best protection during the cleaning of dental operatories? A. Vinyl B. Cotton C. Utility D. Latex The correct answer is C. Utility gloves Utility gloves are designed to provide best protection during cleaning of dental operatories.  Utility gloves should be used during cleaning the dental operatories.  Utility gloves are thicker than latex and vinyl gloves.  These have larger cuffs and are designed to handle wastes more easily.  Utility gloves have greater tear strength and are more water resistant. 

# If a chemical agent is produced by a cell and if the agent acts on the same cell, the effect is termed as: A. Endocrine effect B. Paracrine effect C. Autocrine effect D. None of the above # All of the following are autocoids except: A. Histamine B. Eicosanoids C. Serotonin D. Insulin # The following is believed to be a second hormonal messenger in many tissues. A. Cyclic AMP B. Prostaglandins C. Calcium ions D. Adenyl cyclase # Drug receptors for steroids are present in the: A. Nuclear chromatin B. Cell membrane C. Cytoplasm D. Nucleus

# Most deaths due to COVID-19, an infection due to novel coronavirus has occurred till date (23rd March) in which country? A. Russia B. China C. Italy D. USA The correct answer is C. Italy. No. of Deaths till Date. Italy  - 5476 China - 3270 Russia - 1 USA -  458