Identify and describe the functions of labeled parts A-F, focusing on endocrine glands and thermoregulation.

• A: Brain (specifically, the hypothalamus and pituitary gland are relevant for endocrine functions and homeostasis).
• B: Hair follicle (part of the skin).
• C: Sweat gland (part of the skin).
• D: Pancreas.
• E: Kidney.
• F: Adrenal gland (located above the kidney).

Endocrine glands secrete hormones directly into the bloodstream.

• A (hypothalamus/pituitary) is an endocrine gland.
• D (pancreas) is an endocrine gland.
• F (adrenal gland) is an endocrine gland.
• C (sweat gland) is an exocrine gland.
• E (kidney) is primarily an excretory organ, not solely an endocrine gland in this context.

• A (hypothalamus in the brain) is the thermoregulatory center.
• B (hair follicles/skin) are involved in insulation and piloerection.
• C (sweat glands) are involved in cooling the body through sweat evaporation.

• a) Hormone secreted by part A: The pituitary gland (part of A) secretes Antidiuretic Hormone (ADH), which regulates water content.
• b) Target organ E: Part E is the kidney, which is the target organ for ADH.

1.5.1 Write the LETTERS of the parts that serve as endocrine glands only.

• A, D, F

1.5.2 Give the LETTERS and NAMES of the parts responsible for the regulation of body temperature.

• A (Brain/Hypothalamus), B (Hair follicle/Skin), C (Sweat gland)

1.5.3 Name the following with regard to the regulation of water content in the blood:

*a) Hormone secreted by part A

• Antidiuretic Hormone (ADH)

*b) Target organ E

• Kidney