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2026年全國醫(yī)學(xué)英語水平考試（METS二級(jí)）練習(xí)題及答案四
1). Blood Circulation■Blood circulation may be( )…………as the circular movement of blood around the body.This is accomplished within the vascular system， which is composed of the three basic( )…………the blood， the heart and a series of closed tubes known( )…………as blood vessels.■Blood vessels are of three kinds， arteries， capillaries and veins.Arteries are tubes carrying blood away from the heart.Veins， on the other hand， are tubes carrying blood back to the heart.Arteries and veins are connected by the( )…………tube known as capillaries.■The circulation is mainly brought about by the pumping action of a hollow，muscular organ， the heart.Its( )…………is to pump blood to all parts of the body.■Briefly， this is what happens as blood circulates.Part of the blood in the heart has just received a fAesh store of oxygen from the lungs.This blood is( )…………the largest artry， the aorta.From the artery it passes into the apillaries.Here the blood gives off oxygen and food materials， which have been( )…………from the small intestine and liver to the tssues.Waste products， jincluding the gas， carbon dioxide， are received.It is returned to the heart by way of two large veins.■The blood is then pumped from the heart through the large pulmonary artery to the lungs.In the lungs carbon dioxide is discharged and oxygen is reeved.The oxygen( )…………blood is then returned to the heart through the pulmonary veins and another cycle begins.■There are two major circulation systems in the body.In the greater， or systemic circulation， blood is ( )…………from the heart to every part of the body and back to the heart.In the lesser， or pulmonary， circulation， blood travels from the heart to the lungs and from the lungs back to the heart.There are also ( )…………minor systems， such as the hepatic circulation through the liver， and the cerebral circulation through the brain.( )
A.components
B.transported
C.pumped
D.laden
E.fusion
F.various
G.absorbed
H.function
I.collectively
J.tiniest
A.defined
A.expel

正確答案：A