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Reading a book requires rapid movement of the eyes - VCE - SSCE Biology - Question 6 - 2002 - Paper 1
Question 6
Reading a book requires rapid movement of the eyes. a. Explain whether the nervous system or the endocrine system of your body controls this rapid movement of the e... show full transcript
Worked Solution & Example Answer:Reading a book requires rapid movement of the eyes - VCE - SSCE Biology - Question 6 - 2002 - Paper 1
Step 1
a. Explain whether the nervous system or the endocrine system of your body controls this rapid movement of the eyes.
Answer
The nervous system controls the rapid movement of the eyes when reading a book. This is primarily through the peripheral nervous system, which quickly transmits signals from the brain to the muscles that control eye movement. The response is immediate, allowing for fast adjustments to visual stimuli.
In contrast, the endocrine system, which involves hormone release, works more slowly. Hormonal signals travel through the bloodstream, which takes longer to initiate and regulate responses. Therefore, for tasks requiring swift reactions, such as eye movement during reading, the nervous system is the primary control mechanism.
Step 2
b. Explain how most cells of the body can be involved in situation 1, while only some cells are involved in situation 2.
Answer
In situation 1, regarding blood sugar regulation, all body cells have receptors for insulin, enabling the control of glucose levels throughout the body. This widespread receptor distribution allows most cells to respond to changes in blood sugar levels.
Conversely, in situation 2, the release of thyroxine involves only specific cells in the thyroid gland that have receptors responsive to Thyroid Stimulating Hormone (TSH). Thus, only those targeted cells within the thyroid are involved in this hormonal process, making it a more localized response.