Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

16. The Endocrine System

Introduction to the Endocrine System

Anatomy & Physiology

16. The Endocrine System

Introduction to the Endocrine System

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3:19 minutes

Problem 10

Textbook Question

Hormones
a. Are produced by exocrine glands
b. Are carried to all parts of the body in blood
c. Remain at constant concentration in the blood
d. Affect only non-hormone-producing organs

Verified step by step guidance

Step 1: Begin by understanding the definition of hormones. Hormones are chemical messengers produced by endocrine glands, not exocrine glands. Exocrine glands release substances like sweat or saliva through ducts, while endocrine glands release hormones directly into the bloodstream.

Step 2: Recognize how hormones are transported in the body. Hormones are carried through the bloodstream to target tissues or organs, allowing them to reach various parts of the body.

Step 3: Consider the concentration of hormones in the blood. Hormone levels in the blood are not constant; they fluctuate based on factors such as feedback mechanisms, time of day, and physiological needs.

Step 4: Evaluate the scope of hormone effects. Hormones can affect hormone-producing organs (e.g., the pituitary gland influencing the thyroid gland) as well as non-hormone-producing organs (e.g., insulin affecting muscle and liver cells).

Step 5: Based on the analysis of each option, identify the correct characteristics of hormones and eliminate incorrect statements by comparing them to the biological functions of hormones.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Hormone Production

Hormones are chemical messengers produced by endocrine glands, not exocrine glands. Endocrine glands release hormones directly into the bloodstream, allowing them to travel throughout the body and exert their effects on various target organs.

Hormonal Transport

Once produced, hormones are transported via the bloodstream to target tissues and organs. This transport mechanism enables hormones to influence physiological processes across different parts of the body, highlighting their systemic role in regulating bodily functions.

Hormonal Regulation

Hormone levels in the blood are not constant; they fluctuate based on the body's needs and regulatory mechanisms. Feedback loops, such as negative feedback, help maintain homeostasis by adjusting hormone concentrations in response to changes in the internal environment.