Its essential parts are: the blood, the heart, a system of tubular blood vessels.

153)What does the blood comprise in all vertebrates.

In all vertebrates the blood comprises plasma, white blood cells and red ones.

154)What substances does the human blood plasma consist of ?

Human plasma consists of water (92 percent) proteins, organic compounds and 0,9 percent of inorganic salts, chiefly sodium chloride.

155)How many red cells are there in the human blood ?

There are about 35 trillion red cells

156)How long do the red cells live ?

Red cells live 25-100 days

157)How many circuits do the red cells make in the blood stream ?

Red cells make 50.000 or more circuits

158)Where are the red cells produced ?

They are produced in the bone marrow

159)Where are the red cells numerous?

In infants and in persons living in high mountains

160)Where are cells destroyed chiefly?

In the spleen

161)Where have the white cells their activities?

They have in the tissues

162)Where does the number of white cells increase markedly?

They increase markedly in acute infection such as appendicitis

163)What does the entire circulatory system comprise?

It comprises the heart, the blood system of arteries, arterioles, capillaries, veins and the lymphatic system.

164)How many times does the human heart beat per minute?

It beats 72 times per minute

165)How many times per minute does the heart beat in some birds and mammals?

The heart of some birds and mammals beats 200 to 400 times per minute

166)Fill in the blanks with suitable adjectives. The heart has … walls.

slight or heavy muscular walls

167)The entire … system in any vertebrate comprises the heart …

circulatory system

168)The rate is increased by exercise … exitement and some deseases

emotional excitement

169)In birds and mammals the … heart really has two parts.

four-chambered heart

170)The action of the heart is under … nervous control

Involuntary nervous control

171)Translate correctly the present participle of these sentences. The circulatory system serving for internal transport comprises the following parts: the heart and a system of tubular blood vessels.

служащий

172)Translate correctly the present participle of these sentences. Besides producing lymphocytes, the nodes defend the body from infection.

производства

173)Translate correctly the present participle of these sentences.

The blood in man controls the body temperature by regulating the lass of heat .

регулировкой

174)Translate correctly the present participle of these sentences.

 Many of cells con act as phagocytes and protect the body destroying bacteria that invade wounds.

разрушительная

175)Choose the suitable English equivalents for these sentences. Жизненные процессы животных требуют чтобы пища и кислород были доступными для метаболизма.

The life processes of the animals require that food and oxygen be available for metabolism.

176)Choose the suitable English equivalents for these sentences. Главные части системы кровообрашение следуюшие: кровь, сердце и система кровеносных сосудов.

The essential parts of the circulatory system are the blood, the heart and a system of blood vessels.

177)Choose the suitable English equivalents for these sentences. Плазма человека содержит около 92% воды, белок и другие органические компоненты.

Human plasma consists of about 92 per cent of water, proteins and other organic compounds.

178)Choose the suitable English equivalents for these sentences. Она содержит 0,9% неорганических солей в часности хлористый натрий.