Quiz: Histology — AUA MCQ

The muscular arteries are :

A large arteries B small sized arteries C medium sized arteries D arterioles

unclear internal elastic lamina in the aorta is due to :

A its absence B its small thickness C its similarity to the underlaying elastic fiber D its fenestration

The basilar artery is characterized by having :

A prominent external elastic lamina B prominant internal elastic lamina C prominent collagen fiber D prominent smooth muscle

blood sinusoids are common in :

A brain B stomach C Endocrine gland D skin

In the blood capillaries, the tunica media is formed of

A Elastic fibers B Smooth muscle fibers C Fibroblasts D Pericytes

The following is characteristic of the visceral capillaries

A Have no pores in their wall B Has discontinuous basement membrane C Are found at sites where rapid exchange is needed D Present in the glomerular capillaries

The main component of the tunica media of the medium-sized arteries is

A Elastic fibers B Smooth muscle fibers C collagen fibers D Reticular fibers

Metarterioles

A Are connections between arterioles and venules B Are surrounded by a sphincter of elastic fibers at their initial segment C Are lateral branches of capillaries D Are the regulators of the blood flow to the capillaries

The main component of the tunica media of the aorta is

A Elastic fibers B Smooth muscle fibers C Collagen fibers D Reticular fibers

Longitudinally arranged smooth muscle fibers in the IVC are present in

A Tunica intima B Tunica media C Tunica adventitia D Perivascular space

Medium-sized veins have

A Thick tunica media B Narrow lumen C Clear internal elastic lamina D Thick tunica adventitia

Renal glomerular capillaries have

A Endothelium with fenestrae covered by diaphragms B Irregular wide lumen C Continuous basal lamina D Endothelium with wide intercellular space

The basilar artery is characterized by

A Thin tunica media B Clear external elastic lamina C Thick tunica adventitia D Thin internal elastic lamina

Regarding the arterio-venous anastomoses

A When they open, the venous return decreases B Their intermediate segment has myoepithelioid cells in the subendothelium C When they are open, blood passes through the capillary bed D In skin, they constrict in cold weather

Medium-sized arteries have

A Tunica intima poor in elastic fibers B Thick tunica adventitia C Tunica adventitia rich in elastic fibers D Thin tunica intima

The inferior vena cava is characterized by

A longitudinal smooth muscle fibers in tunica adventitia B Tunica media is the thickest layer C Narrow lumen D Thin tunica adventitia

Arterioles are characterized by

A Thick subendothelial C.T. B Prominant internal elastic lamina C Endothelium resting on thin basal lamina D Thick tunica adventitia

Regarding continuous capillaries

A Their endothelium has pores covered by diaphragm B Their diameter is about 30-40 pm C basal lamina is absent D Tight junctions are present between their endothelial cells

Venules are characterized by

A Clear internal elastic lamina B Endothelium resting on thick basal lamina C Thick subendothelial C.T. D Absent external elastic lamina

The aorta has

A Longitudinally arranged collagen fibers in tunica intima B Clear internal elastic lamina C Fenestrated elastic membranes which decrease with age D Circularly arranged collagen fibers in tunica adventitia

At what level of the vascular tree does gas exchange occur

A Capillary B Arteriole C Venule D Elastic artery

Which layer in an artery contains the endothelium

A Tunica intima B Tunica media C Tunica externa D All of the above

In which of the following is a portal system NOT found

A Kidney B Liver C Muscle D Brain

Which layer in an artery is primarily smooth muscle

A Tunica intima B Tunica media C Tunica externa D All of the above

Which layer of the heart is composed of cardiac muscle

A Epicardium B pericardium C Myocardium D Endocardium

What is the pacemaker of the heart

A Sinoatrial node B Atrioventricular node C Bundle of His D Purkinje fiber

Valves are

A numerous in veins of the limbs and in lymphatic vessels B they direct the venous blood towards the heart C they consist of two semilunar folds of the intima D all of the above

For pericytes all are true EXCEPT

A they partly surround the endothelial cells B they have no cytoplasmic processes C they contain actin, myosin, tropomyosin D Non of the above

As regard sinusoidal capillary all are true EXCEPT

A it has a tortuous path and wide lumen (30-40 um) B the endothelial cells have multiple fenestrae without diaphragms C the basal lamina is thick and continuous D present in spleen & liver

What is the venous channel which is around the brain

A continuous capillaries B fenestrated capillaries C sinusoidal capillaries D venous sinus

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