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Hormonal Communication - Coggle Diagram
Hormonal Communication
The Thyroid: An Endocrine Gland
Experimental Evidence
Thyroid ablation in tadpoles: prevents metamorphosis
Thyroid ablation in sheep: causes stunted growth + mental retardation
Thyroxine injection or graft : restores normal growth
Validates
Misconception: “The thyroid only affects growth” Correction: Thyroid hormones regulate metabolism, oxygen consumption, nervous activity and development
Inquiry Skills:
Observing organisms
Interpreting experiments
Developing explanations
Comparing experimental lots
Concluding scientific explanations
Thyroid Gland
Produces T3 and T4
-Target organs: heart, liver, kidney
-Regulates: metabolism, growth, development
Misconception:“A gland can, by a specific hormones, stimulate an organ or another gland” Correction: A gland change the activity of an organ or another gland, either activate or de-activate.
Thyroid Disorders
Hypothyroidism: Low T3/T4 secretion
Hyperthyroidism:
Excessive T3/T4 secretion
Result from imbalanced
Inquiry Skills:
Logical reasoning
Connecting evidence with explanations
Observing symptoms
Comparing clinical observations across species
Functional Characteristics of an Endocrine Gland
Structure
Thyroid Follicles
Epithelial Cells: Absorb iodine and amino acids from blood and synthesize hormones
Colloid: Stores thyroid hormones
Inquiry Skills:
Observing techniques
Describe an organ
Microscopic observation
Structure-function analysis
Classifying tissues
Coding of the Hormonal Message
Hormones: Bind to specific receptors and activate target cells
Target Cells: Respond only if they possess hormone receptors
Hormone Concentration: Modifies the intensity of response
Controls
Misconception: “The more hormone present, the stronger the effect on the target cell”. Correction: A cell’s response does not only depend on the quantity of hormone but also on: The number of receptors on the target cell, If the receptors are functional and Formation of hormone-receptor complex
Inquiry Skills:
Graph interpretation
Analyzing Data
Interpreting a diagram
Overall Hormonal Model
Internal/External Stimuli
Activates
Endocrine gland
Secretes
Hormone
Travels through
Blood
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