স্পেশাল বিসিএস (স্বাস্থ্য)

Vasoactive intestinal peptide (VIP) is a gastrointestinal (GI) neurocrine that causes relaxation of GI smooth muscle. For example, VIP mediates the relaxation response of the lower esophageal sphincter when a bolus of food approaches it, allowing passage of the bolus into the stomach.

Explanation :
Gastric ulcer
Ruptures oesophageal varices
Carcinoma of stomach
Ruptured oesophageal varices

Reference: Davidson 23rd; P-640

Mature Quadrinucleate cyst is infective form of E. histolytica

Explanation:

The blood supply to the brain has continuous capillaries (in the blood-brain barrier), the SI has fenestrated capillaries (to facilitate absorption of digestion products), the liver has sinusoids.

Explanation :
Inflammatory arthritis -
Morning stiffness  - present 
Joint pain - Worse after rest and improved after movement 
Temperature - Raised
Joint effusion - Present
Joint crepitation  - Absent

Persistent mild jaundice indicates Gilbert’s syndrome.
Jaundice with high fever and urinary complain indicates leptospirosis.
Recurrent jaundice with neurological abnormality—Wilson’s disease.

Explanation: Loss of acidic gastric contents leads to alkalosis and dehydration with low serum chloride and potassium and raised serum bicarbonate and urea concentrations (hypochloraemic metabolic alkalosis).

HLA complex is key determinant of antigen presentation to T-cell.

Smooth ER is the site of Lipid synthesis

Reference: Davidson 23rd , Page : 716
Explanation : Too much calcium can lead to constipation , and toxicity has been observed in ‘milk-alkali syndrome’.

Refractive Media of the Eye:
From before backwards, these are
1. Cornea
2. Aqueous humour
3. Lens
4. Vitreous body

কোন ব্যাখ্যা যোগ হয় নি।

Secretin is released from small intestine when stomach acid contents come to duodenum.
Functions:
• It inhibits gastric emptying to delay the acid contents of stomach to enter in the duodenum.
• It inhibits gastric secretion.
• It acts on pancreatic duct to produce large volume of watery, NaHCO₃ secretion.
• It stimulates the secretion of NaHCO₃ rich bile in the liver by acting on the bile ducts.

Reactive arthritis (a seronegative spondyloarthropathy) commonly follows genitourinary (Chlamydia) or gastrointestinal infections (Salmonella, Shigella). It presents with asymmetric oligoarthritis, often involving lower limbs, and may include conjunctivitis and urethritis.

Myofibrils are the structural and functional subunits of muscle fiber. Myofibrils are arranged longitudinally in the muscle fiber and runs in the entire length of muscle fiber.

Sarcomere is the structural & functional unit of myofibrils. 

Amastigote form of leishmania donovani are detected in bone marrow aspirate

Diseases caused by viridans streptococcus - Endocarditis

Normally, GFR is about 180 L/day, and tubular reabsorption is 178.5 L/day, leaving 1.5 L/day of fluid to be excreted in the urine.

Examples of Mechanoreceptors
Tactile receptors
1.Merkel cells- Specialised cells present in the epidermis, sense light touch and softness.
2. Meissner corpuscles- An encapsulated nerve ending, present at the upper part of the dermis. They can sense light touch and vibrations.
3. Ruffini endings- These are also encapsulated, present in the dermis. They sense heavy and continuous pressure.
4.Pacinian corpuscles- They are encapsulated by connective tissue, located deep in the dermis of the skin. They respond to deep pressure.

Propioreceptors
These receptors sense body movement and position and help in maintaining the posture. It is required for locomotion and motor skills.
1.Muscle spindles- sense muscular movement.
2.Golgi tendons- sense tension in the tendons during muscle contractions.
3.Joint receptors- sense movement in the ligaments.

Explanation : Root value for Jaw jerk is Pons – V cranial nerve, Biceps jerk is C5, C6,Triceps jerk is C6 to C8 , Supinator jerk or radial periosteal reflex is C7, C8 ,Wrist tendon or finger flexion reflex is C8, T1, Knee jerk or patellar tendon reflex is L2 to L4, Ankle jerk or Achilles tendon reflex is L5 to S2.
Ref : Sembulingam 6th edition (Table-142.3)

• Left-to-right shunts are most common and are typically associated with ASDs, VSDs, or a PDA.

Megaloblastic anemia is primarily caused by impaired DNA synthesis, most commonly due to vitamin B12 or folate deficiency. This leads to ineffective erythropoiesis and the presence of abnormally large red blood cell precursors (megaloblasts) in the bone marrow. A key peripheral blood smear finding is hypersegmented neutrophils (five or more lobes), which are characteristic of defective nuclear maturation in granulocytes.

Prognathism is a feature of acromegaly

Explanation :

Ref : Sembulingam 6th edition (Table- 141.1)

Reference: Lange microbiology/14th/P-514

Reddy highlights the vulnerability of relying solely on documentary age (like birth certificates) due to the possibility of forgery. Medical age estimation methods, which assess age based on physical and skeletal development, are crucial when documentary evidence is absent, unreliable, or disputed. This is particularly relevant in situations like legal proceedings or immigration where age verification is critica
 Answer: A: Reddy warns that documentary age (like birth certificates) can be forged. Medical age estimation is used when documents are unavailable or unreliable.

Primary oocyte is produced during prenatal period.

Explanation :
Sex cord tumor of ovary -
Leydig cell tumor
Sertoli cell tumor
Granulosa cell tumor
Thecoma
Fibroma

Complement products are produced in liver

Explanation : First order neurons (primary neurons) are bipolar cells in the retina. Axons from the bipolar cells synapse with dendrites of ganglionic cells. Second order neurons (secondary neurons) are the ganglionic cells in ganglionic cell layer of retina. Axons of the ganglionic cells form optic nerve. Optic nerve leaves the eye and terminates in lateral geniculate body. Third order neurons are in the lateral geniculate body. Fibers arising from here, reach the visual cortex.
Ref : Sembulingam 6th edition (Page- 989)

Reference: Davidson 23rd, Box-29.1

Explanation: Chronic lymphocytic leukaemia (CLL) is the most common variety of leukaemia

Explanation-
Lesser omentum, Falciform ligament, Coronary ligament from ventral mesogastrium.

Explanation : Amplitude of accommodation varies with age. Amplitude of accommodation at different age groups is: 10 years = 11.0 D, 20 years = 9.5 D, 30 years = 7.5 D, 40 years = 5.5 D, 50 years = 2.0 D, 60 years = 1.2 D, 70 years = 1.0 D.
Ref : Sembulingam 6th edition (Page- 998)

Explanation: Ependymal cells line the cerebral ventricles. Oligodendrocytes are responsible for the formation and maintenance of the myelin sheath. Astrocytes form the structural framework for neurons

Explanation 
Acute inflammatory oedema is due to -
Increased vascular permeability by endothelial cell contraction
Increased capillary hydrostatic pressure 
Breakdown of large molecules of tissue proteins
Increased fluidity of the tissue ground substance. 

Reference: Davidson 23rd; P-858

Reference: Davidson 23rd; P-556

Reference: Davidson 23rd; P-599

Explanation: Leptospirainterrogans persist indefinitely in the convoluted tubules of the kidney.

Connective tissue metaplasia occurs in myositis ossificans

Reference: Davidson 23rd; P-875
সলভ ক্লাসের জন্য আলোচনা পোস্ট দেখুন - [আলোচনা পোস্টের লিঙ্ক]

Stem Breakdown:

Polyuria, polydipsia, and weight loss: These symptoms indicate uncontrolled hyperglycemia, suggesting diabetes mellitus.
Fasting blood glucose of 230 mg/dL and HbA1c of 10.5%: These levels confirm the diagnosis of diabetes, with an HbA1c >6.5% indicating poorly controlled blood glucose.
Option Analysis:

A) Insulin: Insulin is used in type 1 diabetes and in type 2 diabetes when oral agents fail to achieve glycaemic control. However, for most newly diagnosed type 2 diabetes patients, oral hypoglycemic agents are first-line unless there are signs of diabetic ketoacidosis or severe hyperglycemia.
B) Metformin: This is the correct answer. Davidson and Harrison both recommend metformin as the first-line therapy for type 2 diabetes, as it effectively lowers blood glucose by improving insulin sensitivity and reducing hepatic glucose production without causing significant hypoglycemia. It is typically used in patients who are overweight, as it does not promote weight gain.
C) Sulfonylureas: Sulfonylureas (e.g., glipizide, glyburide) are effective in lowering blood glucose but are associated with weight gain and a higher risk of hypoglycemia compared to metformin. They are often used as second-line agents if metformin alone is insufficient.
D) DPP-4 inhibitors: DPP-4 inhibitors (e.g., sitagliptin) help increase insulin secretion and reduce glucagon secretion but are generally used as add-on therapy to metformin. They are not as effective as first-line treatment for most patients with type 2 diabetes.

This patient is most likely suffering from analgesic nephropathy in view of the chronic history of NSAID consumption. Chronic intake can result in papillary necrosis and tubulointerstitial nephritis leading to anaemia, UTIs and haematuria. Diagnosis is made by ultrasound or CT scan alongside this clinical picture. An ultrasound is particularly useful if patients complain of sudden flank pain which can result from sloughed papillae causing urinary obstructions. Antegrade pyelography (D) is used to investigate a potential area of obstruction within the kidney which is not indicated in this case. Retrograde pyelography (A) is conducted to investigate obstructions via a catheter. A renal biopsy (B) would be useful to assess the degree of damage to the kidney but this is not essential as stopping analgesics or replacing them with alternatives, such as paracetamol, can reduce or even improve the condition. An abdominal x-ray alone would not be a useful modality for revealing renal damage in this case (C).

Explanation: Chronic rheumatic heart disease most commonly affects the mitral valve and is responsible for 99% of acquired mitral stenosis

Cigarette smoking is the most important risk factor; air pollutants also contribute.

Explanation -
Signs of hyperthyroidism -
Exopthalmos
Lid retraction or lag
Tachycardia
Atrial fibrillation 
Tremor
HTN
Goiter
Warm,moist skin
Muscle weakness
Pretibial myxoedema

Reference: Langman’s 13th; P-47

Explanation :
Unconjugated hyperbilirubinemia -
Haemolytic anaemia
Ineffective erythropoiesis
Reduced hepatic uptake
Breast milk jaundice
Physiologic jaundice
Gilbert syndrome
Conjugated hyperbilirubinemia -
Dublin johnson syndrome
Autoimmune cholangiopathies

Basal ganglia are part of extrapyramidal system. Hypothalamus is associated with temperature regulation. It controls food habit, emotion & sexual behavior.

Reference: Davidson 23rd , Page : 712 , Box : 29.32

Receptors of calcitonin are found in bone & kidney.

[Robbins 9th 71]

Explanation :
Major criteria of rheumatic fever :
Carditis 
Polyarthritis( migratory) 
Chorea
Erythema marginatum
Subcutaneous nodules
Minor criteria :
Fever
Arthalgia
Previous rheumatic fever
Raised ESR
Leucocytosis
First degree AV block

Explanation: VSD is the most common congenital heart disease