স্পেশাল বিসিএস (স্বাস্থ্য)

Nephritic syndrome is characterized by haematuria (often with dysmorphic RBCs), hypertension, and oliguria due to glomerular inflammation. Massive proteinuria and hyperlipidaemia are features of nephrotic syndrome.

Ref: Davidson 23rd; P-989

Explanation: Calcium is the most abundant cation in the body and powerful homeostatic mechanisms control circulating ionised calcium levels.

Cause of redness in acute inflammation is increase in blood flow

Diethylcarbamazine (DEC)—6 mg/kg in three divided doses for 2 weeks

Reference: Guyton 14th; P- 496

Explanation : Normal duration of synaptic delay is 0.3 to 0.5 millisecond. Synaptic delay is one of the causes for reaction time of reflex activity.
Ref : Sembulingam 6th edition (Page- 785)

Explanation :
Typical feature of nephrotic syndrome -
Generilized oedema
Pitting oedema
Blood pressure : Normal
Proteinuria : 3+/4+ 

Panic disorder is defined by recurrent, unexpected panic attacks, which are abrupt surges of intense fear or discomfort that reach a peak within minutes, accompanied by a cluster of physical and cognitive symptoms (as listed). The "unexpected" nature is key for panic disorder diagnosis.

Reference: Davidson 23rd; P-585
সলভ ক্লাসের জন্য আলোচনা পোস্ট দেখুন - [আলোচনা পোস্টের লিঙ্ক]

The principal sites of tissue reaction is the lungs

Explanation: ‘Koplik’s spots’ seen on buccal mucosa in the early stages of clinical measles, is pathognomonic for measles

Explanation: see question no: 5

: ITP is an autoimmune disorder characterized by isolated thrombocytopenia due to increased platelet destruction and/or impaired platelet production. The hallmark lab finding is a significantly low platelet count (often below 100,000/µL, and sometimes below 20,000/µL), while other cell lines (red blood cells and white blood cells) remain normal. Options a, c, and d are more indicative of other conditions: elevated PT/PTT suggests coagulation factor deficiencies, schistocytes suggest microangiopathic hemolytic anemia, and a positive direct Coombs test indicates autoimmune hemolytic anemia.

Scleritis (inflammation of the sclera) and episcleritis are significant ocular manifestations of RA, indicating more severe systemic disease. Other extra-articular features of severe RA include rheumatoid nodules, vasculitis, Felty's syndrome (RA, splenomegaly, neutropenia), and lung involvement (e.g., interstitial lung disease, pleural effusion).

Symmetric small joint (MCP/PIP) involvement and morning stiffness suggest rheumatoid arthritis (RA). Anti-CCP is highly specific for RA (more than rheumatoid factor). Anti-dsDNA is seen in SLE, anti-Jo-1 in polymyositis, and anti-centromere in CREST syndrome.

• Asthma is characterized by reversible bronchoconstriction caused by airway hyperresponsiveness to a variety of stimuli.
• Atopic asthma is caused by a TH2 and IgE-mediated immunologic reaction to environmental allergens
• Eosinophils are key inflammatory cells found in almost all subtypes of asthma

Explanation :
DMRD used in rheumatoid arthritis -
Meyhotrexate
Sulfasalazine
Hydtoxychloroquine
Leflunomide

Pulmonary surfeactant is secreted by type-II alveolar cells (Type-II pneumocytes)
Critical components of the surfactant layer include the phospholipid dipalmitoylphosphatidylcholine (DPPC), cholesterol, and four surfactant proteins.

Explanation :
Causes of bloody diarrhoea -

Hemorrhoids
IBD
Anal fissure
Colorectal cancer
Diverticulitis
Colon polyps
Angiodysplasia
Colititis
Gastroenteritis
Infections ( Entamoeba histolytica, E.coli,Shigella, Camphylobacter) 
Dysentery
Medications
Unsafe water 
Esophageal problems

Reference: Davidson 23rd; P-841
সলভ ক্লাসের জন্য আলোচনা পোস্ট দেখুন - [আলোচনা পোস্টের লিঙ্ক]

Pepsinogen is synthesized from amino acids in the ribosomes attached to endoplasmic reticulum in chief cells. Pepsinogen molecules are packed into zymogen granules by Golgi apparatus. When zymogen granule is secreted into stomach from chief cells, the granule is dissolved and Pepsinogen is released into gastric juice. Pepsinogen is activated into pepsin by hydrochloric acid.

Reference: Davidson 23rd; P-834
সলভ ক্লাসের জন্য আলোচনা পোস্ট দেখুন - [আলোচনা পোস্টের লিঙ্ক]

Volitional tests of respiratory include
a- Mouth Pressures (Maximal Static Inspiratory and Expirato Pressure).
b- Sniff Test
c- SNIP Test (Sniff pressure at nose measured )
d- Cough Tests

Common anticoagulants used in laboratory :
1. 3.8% sodium citrate or oxalate 
2. Potassium oxalate
3. Paul Heller's mixture                                   
(1.2 gm ammonium oxalate + 0.8% potassium oxalate+100ml distilled water) 
4. Heparin
5. Warfarin
6. Normal saline
7. Dicumarol
8. EDTA

Reference: Davidson 23rd; P-491
সলভ ক্লাসের জন্য আলোচনা পোস্ট দেখুন - [আলোচনা পোস্টের লিঙ্ক]

Oxytocin is secreted from posterior pituitary.

In the vast majority of patients, CAD is caused by atherosclerosis but rarely it can occur as the result of aortitis, vasculitis and autoimmune connective tissue diseases

Bacterial zoonotic diseases Plague

The process of coating a particle to target it for ingestion is called opsonization

Explanation :
Contraction of endothelial cells resulting in opening of interendothelial gaps is the most common mechanism of vascular leakage. It is elicited by histamine, bradykinin, leukotrienes, and other chemical mediators. 

Reactive arthritis (Reiter’s syndrome) presents with arthritis, conjunctivitis, and urethritis (classic triad) after GI/GU infections (e.g., Chlamydia, Shigella). HLA-B27 is strongly associated. HLA-DR4 is linked to RA, HLA-DQ2 to celiac disease.

The most evident symptom is fatigable muscle weakness; movement is initially strong but rapidly weakens as muscle use continues.
Worsening of symptoms towards the end of the day or following exercise is characteristic. There are no sensory signs or signs of involvement of the CNS, although weakness of the oculomotor muscles may mimic a central eye movement disorder. The first symptoms are usually intermittent ptosis or diplopia but weakness of chewing, swallowing, speaking or limb movement also occurs. Resting of the eyelids (looking downwards)
may be followed by increased reflex elevation with up-gaze (so-called Cogan's lid twitch sign). Any limb muscle may be affected, most commonly those of the shoulder girdle; the patient is unable to undertake tasks above shoulder level, such as combing the hair, without frequent rests. Respiratory muscles may be involved and respiratory failure is an avoidable cause of death.

The standard 12-lead ECG is central to confirming the diagnosis and deciding immediate management of ACS Patients

Reference: Davidson 23rd , Page : 505
Explanation : The most common cause of aortic aneurysm is atherosclerosis.

Explanations:
The centrosomes are microtubule-organizing centers (MTOCs) that contain γ-tubulin. The microtubules grow out of this γ-tubulin in the pericentriolar material. When a cell divides, the centrosomes duplicate themselves, and thepairs move apart to the poles of the mitotic spindle, where they monitor the steps in cell division.

Uniaxial- elbow
Biaxial- wrist
Multiaxial- shoulder/hip

Reference: Davidson 23rd; P-577

Explanation :
Common cause of haemoptysis -
Tuberculosis
Bronchogenic carcinoma
Lung abscess
Bronchiactasis
Pulmonary embolism
LVF
MS
Bleeding disorder

Functions of centriole/centrosome:
1. Centrosome initiate formation of microtubules.
2. Centrosome forms mitotic spindle.
3. Centrosome provides basal bodies for cilia and flagella.
4. Centrioles self-replicate just before cell division.

Explanation- pH of pancreatic juice is approximately 8.0.
Reference-Ganong physiology/26th/P-454/T-25.3

Liquefactive necrosis occure in Pyogenic bacterial infection, brain hypoxia.

Answer: A
Explanation: The "butterfly" or malar rash is a hallmark feature of systemic lupus erythematosus (SLE), described in both Davidson and Harrison. This rash typically spares the nasolabial folds and is often triggered by sun exposure. SLE is a multisystem autoimmune disease, and skin manifestations like the malar rash are part of the diagnostic criteria.

Explanation: Fragile X syndrome is the most common inherited cause of intellectual disability. Davidson explains that the condition is caused by an expansion of the CGG trinucleotide repeat in the FMR1 gene on the X chromosome, leading to abnormal brain development. Harrison adds that Fragile X syndrome typically presents with developmental delay, intellectual disability, and characteristic facial features, such as a long face and large ears.

Explanation :
Sites of moist gangrene -
Intestine is the commonest sites
Mouth
Pressure area
Vulva
Scrotum
Anterior abdominal wall
Thigh

About 50% of the dry weight of bone matrix is inorganic materials. Calcium hydroxyapatite is most abundant, but bicarbonate, citrate, magnesium, potassium, and sodium ions are also found. Significant quantities of noncrystalline calcium phosphate are also present. The surface of hydroxyapatite crystals is hydrated, facilitating the exchange of ions between the mineral and body fluids.

(Ref: medical examination review anatomy P:52)

Explanation :
Sex chromosomal aneuploidy :
Turners syndrome : 45,XO
Klinfelters syndrome : 47,XXY
Super female : 47,XXX

Von Willebrand factor is synthesised by endothelial cells

Combination of co-amoxiclav (amoxicillin + clavulanic acid) and a macrolide like clarithromycin for severe community-acquired pneumonia. This regimen covers Streptococcus pneumoniae, atypical organisms (e.g., Mycoplasma pneumoniae, Chlamydia pneumoniae), and other common pathogens.

Ref. Robbins 9th p323, T-7.10

HCl activates pepsinogen to active pepsin.

Explanation :
Hepatitis B related infection :
Partially dsDNA
Hepadna virus
Route of transmission  : Parenteral, sexual contact,Perinatal
Frequency of chronic liver disease : 5-10%

Explanation :
Esophageal causes of hematemesis -
Laceration( Mallory weiss syndrome) 
Esophageal perforation
Varices ( cirrhosis)  most common
Chemical esophagitis
Esophageal ulcer

A characteristic feature of the pineal gland is the presence of variously sized concretions of calcium and magnesium salts called corpora arenacea, or brain sand, formed by mineralization of extracellular protein deposits.

Man acts as both definitive and intermediate host in T. solium

Explanation : Pupillary reflexes are classified into three types: 1. Light reflex 2. Ciliospinal reflex 3. Accommodation reflex.
Ref : Sembulingam 6th edition (Page- 994)

Explanation: The cardinal symptoms are rectal bleeding with passage of mucus and bloody diarrhoea.

Myosin-thick filament