BIOL 2402 Lecture Exam 1 - Chapter 17:
The Endocrine System Questions With
100% Correct Answers (2025-2026)
Updated.
Word Origins - Answer -Endocrine means "affecting within"
-First called "internal secretion" in 1855
-What was being secreted was hormones, discovered in 1905, and called chemical substances
that control and regulate the activity of certain cells or organs
Endocrine System - Answer a system where glands secrete hormones (signals that control
other organs) into the blood to travel to cells throughout the body
Endocrine System - Answer -Made up of glands that produce and secrete hormones
-These glands are found in many different areas of the body
What do these hormones do then? - Answer -regulate growth
-regulate metabolism
-regulate body fluid balance
-regulate sexual development
-regulate response to stress and injury
*MAINTAINS HOMEOSTASIS
Homeostasis - Answer -your body has an ideal internal environment, the perfect setting for
optimal performance of all your organs
-when it's too hot you turn the AC up = when you have too much pH in your blood your glands
release hormones
-"Thermostat of your body"
Methods to Maintain Homeostasis - Answer -Both the Nervous and Endocrine systems
maintain the "temperature"
, -Slow acting but w/ widespread long lasting effects
Hormones - Answer -used by the endocrine system
-Big idea: Hormones are chemical messengers that act on Target cells
Main Structures of Endocrine System - Answer
ENDOCRINE SYSTEM - Answer -major organs include the pituitary, thyroid, parathyroids,
adrenals, & pineal gland
-Hypothalamus = special neuroendocrine gland
-some organs have endocrine tissue, but have other primary functions. This includes pancreas,
thymus, gonads, etc.
Gland Stimulation - Answer How do the glands know to release hormones?
-Stimulated by one of three methods
Hormonal Stimulation - Answer A gland is triggered by the release of a hormone by a
hormonal signal from a controlling gland
-EX:
- Pituitary gland releases thyroid stimulating hormone (TSH)
- TSH stimulates thyroid gland to release thyroid hormone (TH) into the blood vessels
TH = increases metabolism, proper bone development
Humoral Stimulation - Answer A gland is triggered to secrete hormones by a change in
nutrient levels in the blood
-EX:
1. blood glucose levels increase
2. Pancreas is stimulated to release insulin
3. Signals cells to increase glucose uptake
4. blood glucose levels lower
The Endocrine System Questions With
100% Correct Answers (2025-2026)
Updated.
Word Origins - Answer -Endocrine means "affecting within"
-First called "internal secretion" in 1855
-What was being secreted was hormones, discovered in 1905, and called chemical substances
that control and regulate the activity of certain cells or organs
Endocrine System - Answer a system where glands secrete hormones (signals that control
other organs) into the blood to travel to cells throughout the body
Endocrine System - Answer -Made up of glands that produce and secrete hormones
-These glands are found in many different areas of the body
What do these hormones do then? - Answer -regulate growth
-regulate metabolism
-regulate body fluid balance
-regulate sexual development
-regulate response to stress and injury
*MAINTAINS HOMEOSTASIS
Homeostasis - Answer -your body has an ideal internal environment, the perfect setting for
optimal performance of all your organs
-when it's too hot you turn the AC up = when you have too much pH in your blood your glands
release hormones
-"Thermostat of your body"
Methods to Maintain Homeostasis - Answer -Both the Nervous and Endocrine systems
maintain the "temperature"
, -Slow acting but w/ widespread long lasting effects
Hormones - Answer -used by the endocrine system
-Big idea: Hormones are chemical messengers that act on Target cells
Main Structures of Endocrine System - Answer
ENDOCRINE SYSTEM - Answer -major organs include the pituitary, thyroid, parathyroids,
adrenals, & pineal gland
-Hypothalamus = special neuroendocrine gland
-some organs have endocrine tissue, but have other primary functions. This includes pancreas,
thymus, gonads, etc.
Gland Stimulation - Answer How do the glands know to release hormones?
-Stimulated by one of three methods
Hormonal Stimulation - Answer A gland is triggered by the release of a hormone by a
hormonal signal from a controlling gland
-EX:
- Pituitary gland releases thyroid stimulating hormone (TSH)
- TSH stimulates thyroid gland to release thyroid hormone (TH) into the blood vessels
TH = increases metabolism, proper bone development
Humoral Stimulation - Answer A gland is triggered to secrete hormones by a change in
nutrient levels in the blood
-EX:
1. blood glucose levels increase
2. Pancreas is stimulated to release insulin
3. Signals cells to increase glucose uptake
4. blood glucose levels lower
