NEET PG/NEXT (MCQs)

2021-06-10 18:00:01 Explanation

Reduced hemoglobin: It results from release of Oxygen from OxyHb

Carbaminohemoglobin: In this, Carbon di oxide is attached to globin part of Hb. The affinity of Hb for Carbon di oxide is about 20 times that for Oxygen

Carboxyhemoglobin: Carbon monoxide is attached to Hb where O2 is normally attached. The affinity of Hb for CO is 200-300 times that for Oxygen. It is normally present in small amounts, but in large amount in smokers in whom it impairs Oxygen transport.

Methemoglobin: When blood is exposed to some drugs, or oxidizing agents in vitro or in vivo, the ferrous iron of Hb is converted into ferric iron, forming MetHb, which is dark in color. When present in large amounts, it gives a dusky appearance to the skin. Small amounts of MetHb are formed normally but an enzyme system converts it back to Hb. Open / Comment

2021-06-09 18:00:03 Explanation

Primary oocyte remain In the prophase of meiosis 1 until primodial follicle grow to form primary follicle which grows to form secondary/graffian follicle.

The secondary follicle enters preovulatory stage 36 hrs before ovulation when LH surge occurs resulting in completion of Meiosis 1 and formation of secondary oocyte and 1st polar body 12 hrs prior to ovulation (LH peak occurs) Open / Comment

2021-06-08 18:00:02 Explanation

Conditions and Pathogens
• Pathogens (Clostridium) for gas gangrene: CI. perfringens/welchii, CI. septicum and CI. novyi.
• Pathogens (Clostridium) for tetanus: CI. tetani
• Pathogens (Clostridium) for food poisoning: CI. perfringens type A, CI. perfringens type C and CI. botulinum
• Pathogens (Clostridium) for acute colitis: CI. difficile. Open / Comment

2021-06-08 14:00:08 https://t.me/NEET_PG_NEXT_FMGE Open / Comment

2021-06-07 18:00:02 Explanation

Toxic Megacolon (Megacolon toxicum)
• It is an acute form of colonic distension.
• It is characterized by a very dilated colon(megacolon), accompanied by abdominal distension(bloating) and sometimes fever, abdominal pain or shock
• Toxic megacolon is usually a complication of inflammatory bowel disease such as ulcerative colitis and more rarely Crohn’s disease. Open / Comment

2021-06-06 18:00:03 Explanation

NADPH
• It provides the reducing equivalents for biosynthetic reactions and the oxidation-reduction involved in protecting against the toxicity of ROS (Reactive oxygen species), allowing the regeneration of GSH (Reduced glutathione)
• NADPH is also used for anabolic pathways, such as lipid synthesis, cholesterol synthesis and fatty acid chain elongation. Open / Comment