Prepare for NEET Biology Body Fluids And Circulation with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert solutions on blood, lymph, and circulation.
In a paternity dispute, the mother has blood group AB and the child has blood group O. Which of the following blood groups COULD NOT be the father's?
A
B
AB
O
A patient presents with a rare bleeding disorder characterized by a prolonged bleeding time but normal platelet count and PT/INR. Further investigation reveals a deficiency in a specific plasma protein crucial for platelet adhesion. Which of the following factors is MOST likely deficient?
von Willebrand factor
Factor VIII
Factor IX
Fibrinogen
A researcher is studying the kinetics of thrombin generation in vitro. Adding a substance significantly shortens the lag time and increases the peak thrombin concentration. This substance MOST likely mimics the activity of which coagulation factor complex?
Factor VIIa/Tissue Factor complex
Factor Xa/Va complex
Factor VIIIa
Factor XIIa
Which specific cellular adhesion molecule is MOST critical for the proper trafficking and homing of lymphocytes to the high endothelial venules (HEVs) of lymph nodes?
ICAM-1
VCAM-1
L-selectin
PECAM-1
A rare genetic disorder causes a deficiency in the production of the chemokine CCL21. Which of the following would be the MOST likely consequence of this deficiency?
Increased susceptibility to bacterial infections
Impaired migration of dendritic cells and T-cells to lymph nodes
Overproduction of antibodies
Reduced phagocytosis by macrophages
Mutations in the FOXC2 gene can cause lymphedema-distichiasis syndrome. Which of the following BEST explains the link between FOXC2 and lymphatic function?
FOXC2 encodes an antibody essential for fighting infections in the lymphatic system.
FOXC2 regulates the production of lymph fluid.
FOXC2 encodes a structural protein of lymphatic vessel walls.
FOXC2 regulates the development and differentiation of lymphatic vessels.
A patient's ECG reveals a regular rhythm, a heart rate of 45 bpm, a P wave preceding each QRS complex, and a PR interval of 0.28 seconds. The QRS complexes are normal in duration. What is the MOST likely diagnosis?
Sinus bradycardia
Sinus bradycardia with first-degree AV block
Second-degree AV block (Mobitz Type I)
Complete heart block
An ECG shows a regular, narrow-complex tachycardia with a rate of 170 bpm. P waves are difficult to discern. Carotid sinus massage terminates the tachycardia. Which is the MOST likely diagnosis?
Ventricular tachycardia
Atrial fibrillation
Supraventricular tachycardia (SVT)
Sinus tachycardia
A patient's ECG shows a heart rate of 150 bpm, a regular rhythm, a normal QRS complex duration, and inverted P waves before each QRS complex. The P waves are best visualized in lead II. What is the MOST likely diagnosis?
Atrial Tachycardia
Sinus Tachycardia
Ventricular Tachycardia
Atrial Fibrillation
A researcher is studying the circulatory system of a newly discovered vertebrate species. They observe that blood passes through the heart twice during one complete circuit around the body. However, they also notice some mixing of oxygenated and deoxygenated blood within the ventricle. Which adaptation is MOST LIKELY present in this species to minimize this mixing?
A four-chambered heart
Complete separation of atria and ventricles
An incomplete interventricular septum
Two separate circulatory circuits for pulmonary and systemic circulation
