Biology 30: Module 2: Lesson 4

Topics: Thyroid hormone, Iodine, Triiodothyronine Pages: 6 (820 words) Published: October 9, 2012
|(15 marks) |Module 2: Lesson 4 ASSIGNMENT | | | | | |This Module 2: Lesson 4 Assignment is worth 15 marks. The value of each assignment and each question is stated in the left margin. |

|(15 marks) |Lesson 4 Assignment: Theoretical Lab -George has a Thyroid Problem | | | | | |Use the information below to answer the following questions: | | | | | |Jordan, a young Grade 12 student, loves his orange, fluffy cat George. Lately, George has not been his usual rambunctious self and | | |just wants to sleep all the time. He is losing clumps of hair and Jordan has taken him in to see the veterinarian. The following | | |questions are about the veterinary investigation of the sick cat, thought to be suffering from a malfunction of the thyroid gland. |

|(1 marks) |1. |a. |Identify the hormones produced by the thyroid gland. |

|The three hormones that are produced by the thyroid gland are thyroxine (T4), triiodothronine (T3) and calcitonin.| | |

|(1 mark) | |b. |Just by looking at the cat, measuring its heart rate, and discussing why Jordan brought the cat in to the veterinary| | | | |office, identify the hormone that the veterinarian thought was most likely responsible for its condition. |

| | |The hormone that is most likely responsible for the cat’s condition is triiodothronine (T3) and thyroxine (T4). | |The cat seems to lack these two hormones because T3 and T4 is responsible for regulating body metabolism and the| |growth and differentiation of tissues. |

|(2 marks) | |c. |State two symptoms that may have led the veterinarian to suspect that George was suffering from a thyroid hormone | | | | |deficiency. |

| | |George is experiencing sleepiness and hair loss which seems to be due to lower secretion of low amounts of thyroid| |hormones. Hypothyroidism. |

| |Use this additional information to answer the following questions: | | | | | |A sample of tissue was taken from the thyroid gland of the sick cat and a stained section was prepared for viewing under the | | |microscope. This was compared with a similarly prepared section taken from a...
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