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channels and vessels in the lower Vertebrates, but in the Mammals, including
Man, it is essentially a network of vessels so that in higher animals the so-called
closed circulatory system gradually takes the ascendancy over the
predominantly open circulatory system of lower forms. The lymphatics carry
lymph which consists of a liquid plasma with white cells. Both systems are
closely associated, but the lymphatic plays a relatively passive role.
II. Stady the notes, consult a dictionary about the way the words are pronounced
trace проследить
vessel сосуд
vascular сосудистый
float плавать
channel проток
network сеть
ascendancy доминирующее влияние
III. Find topical sentences in each paragraph of the text and make a model of the
text informations.
IV. Read the text once more and sum up what it has to say on the following
points:
1. Circulation in the Invertebrates.
2. Circulation in the Vertebrates.
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