Describe what happens in the nervous system when you duck your head to avoid an object flying toward it. 2. what protects the brain and spinal cord from injuries? 3. what does the cerebrum control? 4. name the lobes of the cerebral cortex, and identify a function of each lobe. 5. how does the brain control the endocrine system? critical thinking questions 1. explain how the case of phineas gage influenced the development of psychology. 2. give examples of activities or processes that are controlled by the somatic nervous system. 3. an elderly person suffered from a stroke that damaged part of his brain. he can speak easily, but his sentences make no sense. explain which area of his brain was most likely damaged. 4. assume that a pet scan was made of the brain of a person speaking and of the brain of a person smelling a flower. describe how you would expect the pet scan of each person's brain to look. 5. why is a home heating system a good model for the way that the thyroid gland is controlled by the pituitary gland and hypothalamus? describe how each system is controlled.

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs

1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.