Question

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Answer 1

Answer:

(a) "Iodine is needed by the thyroid gland for the production thyroxin hormone. This hormone regulates fat, protein and carbohydrate metabolism in our body. If quantity of iodine in food is lesser than required, then the neck will swell up due to the enlargement of thyroid gland."

iodine deficiency causes goitre

(b) "Nerve impulses begin in a dendrite, move toward the cell body, and then move down the axon. A nerve impulse travels along the neuron in the form of electrical and chemical signals. The axon tip ends at a synapse. A synapse is the junction between each axon tip and the next structure."

Answer 2

• Iodine is needed by the thyroid gland for the production thyroxin hormone. This hormone regulates fat, protein and carbohydrate metabolism in our body. Therefore the iodized salt is advised. A disease caused by it is goiter .
• Symptom : your thyroid gland will enlarge as it tries to increase the production of thyroid hormones.
• Nerve impulses begin in a dendrite, move toward the cell body, and then move down the axon. A nerve impulse travels along the neuron in the form of electrical and chemical signals. The axon tip ends at a synapse. A synapse is the junction between each axon tip and the next structure.