Lab 9 The Endocrine System BIO201L
Student Name: Gloria Arajulu
Access Code (located on the lid of your lab kit): AC_OF2X1AP
Pre-Lab Questions
1. What is the function of the endocrine system?
The endocrine system regulates and controls various physiological processes through the
release of hormones into the bloodstream.
2. Research two types of hormones and describe the mode of action for each.
1. Insulin: Insulin is a peptide hormone that lowers blood glucose levels. It binds to
insulin receptors on cell surfaces, facilitating glucose uptake and storage in cells,
reducing blood glucose levels.
2. Testosterone: Testosterone is a steroid hormone. It enters cells and binds to specific
receptors in the nucleus, affecting gene expression. It promotes male sexual characteristics
and plays a role in muscle growth and bone density regulation.
3. Which gland is both endocrine and exocrine?
pancreas
4. Which hormones control the fight or flight response?
Epinephrine, norepinephrine, and cortiso
5. What is type 1 diabetes and what is the treatment for this disease?
Type 1 diabetes is when the pancreas does not produce insulin or produces very little.
Treatment for this disease is insulin therapy, and monitoring blood sugar levels through
appropriate diet and exercise.
6. Describe how Ca2+ levels in the blood are regulated by hormones.
When blood calcium levels decrease, parathyroid hormone (PTH) is released, stimulating the
release of calcium from bones and increasing calcium absorption from the intestines and
reabsorption from the kidneys. When blood calcium levels rise, calcitonin is released,
promoting calcium deposition in bones and reducing calcium absorption and reabsorption.
These hormones help maintain calcium homeostasis.
7. How do the nervous and endocrine systems work together to maintain homeostasis of the body?
The nervous and endocrine systems work together to maintain
homeostasis by coordinating and regulating the body's physiological
This study source was downloaded by 100000902171055 from CourseHero.com on 12-09-2025 23:41:07 GMT -06:00
https://www.coursehero.com/file/209063005/lab-9pdf/
, Lab 9 The Endocrine System BIO201L
processes. The nervous system sends rapid electrical signals (nerve impulses) to control
immediate responses, while the endocrine system releases hormones into the bloodstream to
regulate slower, long-term processes. They communicate through feedback loops, where the
endocrine system can modulate the nervous system's
This study source was downloaded by 100000902171055 from CourseHero.com on 12-09-2025 23:41:07 GMT -06:00
https://www.coursehero.com/file/209063005/lab-9pdf/
Student Name: Gloria Arajulu
Access Code (located on the lid of your lab kit): AC_OF2X1AP
Pre-Lab Questions
1. What is the function of the endocrine system?
The endocrine system regulates and controls various physiological processes through the
release of hormones into the bloodstream.
2. Research two types of hormones and describe the mode of action for each.
1. Insulin: Insulin is a peptide hormone that lowers blood glucose levels. It binds to
insulin receptors on cell surfaces, facilitating glucose uptake and storage in cells,
reducing blood glucose levels.
2. Testosterone: Testosterone is a steroid hormone. It enters cells and binds to specific
receptors in the nucleus, affecting gene expression. It promotes male sexual characteristics
and plays a role in muscle growth and bone density regulation.
3. Which gland is both endocrine and exocrine?
pancreas
4. Which hormones control the fight or flight response?
Epinephrine, norepinephrine, and cortiso
5. What is type 1 diabetes and what is the treatment for this disease?
Type 1 diabetes is when the pancreas does not produce insulin or produces very little.
Treatment for this disease is insulin therapy, and monitoring blood sugar levels through
appropriate diet and exercise.
6. Describe how Ca2+ levels in the blood are regulated by hormones.
When blood calcium levels decrease, parathyroid hormone (PTH) is released, stimulating the
release of calcium from bones and increasing calcium absorption from the intestines and
reabsorption from the kidneys. When blood calcium levels rise, calcitonin is released,
promoting calcium deposition in bones and reducing calcium absorption and reabsorption.
These hormones help maintain calcium homeostasis.
7. How do the nervous and endocrine systems work together to maintain homeostasis of the body?
The nervous and endocrine systems work together to maintain
homeostasis by coordinating and regulating the body's physiological
This study source was downloaded by 100000902171055 from CourseHero.com on 12-09-2025 23:41:07 GMT -06:00
https://www.coursehero.com/file/209063005/lab-9pdf/
, Lab 9 The Endocrine System BIO201L
processes. The nervous system sends rapid electrical signals (nerve impulses) to control
immediate responses, while the endocrine system releases hormones into the bloodstream to
regulate slower, long-term processes. They communicate through feedback loops, where the
endocrine system can modulate the nervous system's
This study source was downloaded by 100000902171055 from CourseHero.com on 12-09-2025 23:41:07 GMT -06:00
https://www.coursehero.com/file/209063005/lab-9pdf/
