P. 79. Quick check

1. nerve fibre carrying nerve impulses away from the cell body

2. a) nerve impulses; b) hormones.

p. 79. Ex. III. 1c; 2f; 3b; 4g; 5d; 6a;

pp. 79-80. Ex. IV. 1. Favourable stimulus; 2.nervous system;

3. to process information; 4. motor neurones; 5. target cell; 6. water balance; 7. to respond appropriately; 8. considerable distances; 9. insulating material; 10. external environment.

P. 80. Ex. V.

1. Ductless (endocrine) glands secrete their hormones directly into the bloodstream.

2. The endocrine system consists of a number of glands that secrete hormones.

3. Responses to stimuli usually involve the coordinated actions of different parts of the body.

4. The CNS acts as an integration centre and processes information from many sources.

5. Each living organism has its own specific type of sensitivity.

6. Hormones regulate such processes as heart rate, metabolism, gastric secretion etc.

7. Sense organs and effectors occur in different parts of the body.

8. The nervous system of mammals is more complicated than one of single-celled organisms.

9. Neurones convey information in the form of nerve impulses.

10. Blood glucose concentration is regulated by the endocrine system.

p. 80-81. Ex. VI. 1. range from; 2. consists of; 3. occur at; around; 4. acts as; 5. such as; 6. major; 7. apart from; 8. characteristic features; 9. detect; appropriately; 10. involve.