Endocrine Gland Histology lab #5.docx - Endocrine Gland� Histology Objectives 1 2 3 To understand the function of the endocrine system To learn about

Endocrine Gland Histology lab #5.docx - Endocrine Gland�...

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1 Endocrine Gland · Histology Objectives 1. To understand the function of the endocrine system 2. To learn about the major endocrine glands , the hormones they produce, and the effects they initiate 3. To familiarize the student with histological identification of var i ous endocrine glands Background The endocrine system consists of cells and tissues that secrete chemical messengers, called hormones, into the blood . The hormones are transported in the blood, via the circulatory system , to target cells . Once the hormone reaches the target cells and binds to a specific receptor , either on the cell membrane or within the cell cytoplasm or nucleus, it can initiate a response that will facilitate homeostasis in the body. Questions 1. What are some of the major endocrine glands? Thyroid gland, adrenal gland, pituitary gland, hypothalamus, and pineal gland. 2. List the three major categories of hormones. Identify specific hormones within each category . Steroid hormone-estrogen or testosterone. Peptide hormone-prolactic, glucagon, or insulin. Amino acid derivative-adrenaline, thyroxin, and triiodothyronine.
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Procedure Label the endocrine glands in the diagram below . 1. Thyroid gland 2. Parathyroid gland 3. Adrenal gland 4. Testes 5. Pineal gland 6. Thymus 7. Pancreas 8. ovaries Procedure Using the microscope, examine the indicated endocrine glands . Your instructor may alternatively direct you to the Michigan Histology and Virtual Microscopy Learning Resources website at . Draw a picture, identify any indicated structures within the gland, and answer the questions in each section.
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1. In the draw i ng above , identify a pancreatic islet. Identify e x ocrine portions of the pancreas . 2. From which part of the i slet is insulin released? What is the function of insulin? The beta cells in the Langerhans islet releases insulin. The function of insulin is to control blood glucose levels by signaling the liver and muscle and fat cells to take in glucose from the blood. 3. From which part of the islet is glucagon released ? What is the function of glucagon? The alpha cells in the Langerhans islet releases glucagon. The function of glucagon is to prevent blood glucose levels from dropping too low. 4. In general, describe the cause of Type I diabetes and some general signs and symptoms for this condition (American D i abetes Association htt p:// ). The exact cause is unknown but most people with this, their body’s immune system mistakenly destroys insulin producing cells in the pancreas. Signs and symptoms include: increased thirst, frequent urination, extreme hunger, fatigue and weakness, and blurred vision.
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  • Fall '16
  • Dusti Sloan

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