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Пособие.Увлекательный мир биологии.doc
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2. Say whether the statements are true or false:

  1. There are 3 main constituents of blood: plasma, red blood cells and white blood cells.

  2. Plasma consists of water and dissolved substances.

  3. Blood has 2 important functions: transport and protection.

  4. The only organ involved in blood circulation is the heart.

  5. Arteries tend to be closer to the surface of the body than veins.

  6. The capillaries in our skin play an important role in regulating our body temperature.

  7. Contractions of skeletal muscle don't contribute to circulation.

  8. Valves in the heart and in the veins ensure blood flowing in one direction.

3. Work in pairs. Make up 2-3 questions to every paragraph and answer them.

4. Blood pressure, stroke, thrombosis, heart attack are heavy diseases of the circulatory system. Say what do you know about them (causes of becoming ill, consequences of being ill, possible ways of curing).

5. Render into English.

Кровеносная система – система органов кровообращения, состоящая из сердца и кровеносных сосудов. Может быть незамкнутой – кровь поступает из сердца по сосудам в полость тела, омывает клетки, разносит кислород и питательные вещества, поглощает диоксид углерода и конечные продукты обмена, после чего вновь собирается в кровеносных сосудах. Эта кровь чаще бесцветная или зеленовато-голубая благодаря дыхательному пигменту гемоцианину. В замкнутой системе кровообращения кровь находится только в кровеносных сосудах – артериях, венах, капиллярах. Для нее характерно наличие дыхательного пигмента красного цвета – гемоглобина. Она может циркулировать как в одном, так и в двух кругах кровообращения. Второй круг получил название легочного, или малого, так как возник лишь с появлением легочного дыхания.

6. Speak about circulatory system according to the plan.

  1. Constituents of blood.

  2. The functions of blood.

  3. Blood vessels.

  4. Circulation of blood.

  5. Diseases of the circulatory system.

II. Respiratory System

The term "respiration" is used to summarise three processes in organisms: breathing, gaseous exchange and cellular respiration.

RESPIRATION

Breathing

Gaseous exchange

Cellular respiration

Chest movements which bring air (oxygen) into the lungs.

Diffusion of oxygen into the blood and of carbon dioxide out of the blood. Diffusion occurs through the thin moist tissue in the lungs.

Chemical reactions occurring in cells result in the release of energy from foods.

Breathing and gaseous exchange are physical processes occurring outside cells. They are sometimes referred to together as external respiration. On the other hand, cellular respiration involves chemical processes inside cells. It is sometimes called internal respiration.

Breathing

Our bodies and those of animals cannot work without a supply of oxygen. When we breathe in (inhale), air enters our lungs. Oxygen from the inhaled air can then pass through the thin tissue of the lungs into the blood. At the same time, carbon dioxide passes from the blood into the lungs. This carbon dioxide is then expelled when we breathe out (exhale). In order to help this exchange of gases, the chest and ribs act like a pump, transferring gases into and out of the lungs.

The lungs are situated inside the chest cavity or thorax. The sides of the thorax are bounded by the rib cage and there are muscles linking the ribs. At the bottom of the thorax, there is a flexible sheet of muscular tissue called the diaphragm.

Although the lungs have a spongy consistency, they behave like a pair of large, elastic bags. These bags stretch and inflate when the thorax increases in volume. When we breathe in, muscles pull the diaphragm downwards and the ribs upwards and outwards. The thorax increases in size and air is drawn into the lungs. When we breathe out, the diaphragm relaxes and moves upwards and the ribs move inwards. The thorax decreases in size, increasing the pressure on the lungs and air is forced out.

The total volume of an adult's lungs is between 4 and 5 dm3 (4000-5000 cm3). Whilst resting we inhale about 0.5 dm3 of air each breath. After exercise, we breathe more deeply and inhale as much as 2 dm3 with each breath.