Q: In which cardiac wall layer is the conduction system (Purkinje fibers) located?
Anonymous Quiz
20%
A. Inter-trabecular endomysium
0%
B. Musculo-elastic endocardium
80%
C. Subendocardial layer
0%
D. Submesothelial epicardium
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Q: An artery with 10-40 smooth muscle layers and a prominent internal elastic lamina is:
Anonymous Quiz
80%
A. Elastic (conduit) artery
0%
B. Large muscular vein
0%
C. Arteriole
20%
D. Muscular (distributing) artery
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Q: What is the primary function of bronchiolar Club (Clara) cells?
Anonymous Quiz
0%
A. Synthesizing pulmonary surfactant
60%
B. Propelling mucous via ciliary beating
0%
C. Monitoring CO2 levels
40%
D. Protecting epithelium against toxins
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Q: Which feature is exclusively present in the thymic inner medulla?
Anonymous Quiz
0%
A. Subcapsular macrophages
25%
B. Densely packed thymocytes
75%
C. Hassall's corpuscles
0%
D. Blood-thymus barrier capillaries
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Q: Which compartment in the spleen forms the T-cell zone around central arterioles?
Anonymous Quiz
50%
A. Germinal center of Malpighian corpuscle
50%
B. Periarteriolar lymphoid sheath (PALS)
0%
c. Marginal zone of red pulp
0%
D. Cords of Billroth
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Q: Left ventricular coronary blood flow predominantly occurs during:
Anonymous Quiz
20%
A. Diastole due to opening of aortic valve
0%
B. Systole to meet high metabolic demand
60%
C. Diastole as myocardial relaxation frees vessels
20%
D. Systole driven by peak aortic pressure
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Q: Defective GP Ib-IX receptors impair which stage of hemostasis?
Anonymous Quiz
25%
A. Platelet adhesion to collagen via vWF
25%
B. Conversion of fibrinogen to fibrin
25%
C. Thromboxane A2 synthesis
25%
D. Platelet aggregation via GP IIb/IIIa
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Q: Which localized changes cause a rightward shift of the Hb-O2 curve (Bohr effect)?
Anonymous Quiz
100%
A. High PCO2, low pH, high temperature
0%
B. Low PCO2, high pH, low temperature
0%
C. High PCO2, high pH, low 2,3-DPG
0%
D. Low PCO2, low pH, low temperature
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Q: How does pulmonary surfactant prevent the collapse of small alveoli (Laplace)?
Anonymous Quiz
0%
A. Equalizes all alveolar radii during inspiration
100%
B. Lowers surface tension more in smaller alveoli
0%
C. Eliminates the pleural pressure gradient
0%
D. Increases surface tension during expiration
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Q: Phase 0 depolarization in slow-response nodal cardiac cells is driven by:
Anonymous Quiz
50%
A. Rapid inward sodium current
0%
B. Outward potassium current
50%
C. Inward calcium current (L-type Ca2+)
0%
D. Passive sodium diffusion
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Q: Which chemoreceptors primarily detect acute arterial PO2 dropping below 60 mmHg?
Anonymous Quiz
75%
A. Carotid and aortic peripheral chemoreceptors
25%
B. Juxtacapillary (J) receptors
0%
C. Medullary central chemoreceptors
0%
D. Pulmonary stretch receptors
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Q: How does an increase in shear rate affect blood viscosity?
Anonymous Quiz
25%
A. Decreases: RBC rouleaux disperse and deform
50%
B. Increases: RBCs form larger rouleaux
0%
C. Decreases: plasma fibrinogen drops
25%
D. Constant: blood is Newtonian
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Q: If an arteriole radius is reduced by 50%, vascular resistance changes by:
Anonymous Quiz
25%
A. Increases by a factor of 8
25%
B. Decreases by a factor of 2
0%
C. Increases by a factor of 4
50%
D. Increases by a factor of 16
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Q: During isovolumetric ventricular contraction:
Anonymous Quiz
60%
A. Both AV and semilunar valves are closed
20%
B. Aortic valve opens immediately
0%
C. Ventricular volume decreases rapidly
20%
D. Mitral valve stays open
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Q: Decreased left ventricular compliance (higher stiffness) directly causes:
Anonymous Quiz
0%
A. Increased end-systolic volume (ESV)
0%
B. Increased stroke volume (SV)
100%
C. Decreased end-diastolic volume (EDV) and SV
0%
D. Higher passive recoil in early systole
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Q: Phase 0 rapid depolarization in ventricular myocytes is mediated by:
Anonymous Quiz
50%
A. Slow inward Ca2+ current
0%
B. Na+/K+ ATPase activity
0%
C. Outward K+ current
50%
D. Fast inward Na+ current (INa)
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Q: Aortic compliance reduces cardiac workload by:
Anonymous Quiz
25%
A. Raising total stroke volume directly
50%
B. Lowering peripheral capillary resistance
25%
C. Dampening pulsatile flow into continuous output
0%
D. Storing all kinetic energy chemically
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إنتـهى الكويز يا حكماء ، إن شاء الله استفدتو؟
↙️ أسأل الله لكم التوفيق و السداد في إمتحانكم و أعلى العلامات في نتائجكم 💻
شاركونا شحال جبتو من أصل 24/❓
#ya
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