,BIOL 251 Module 9 | Human Anatomy & Physiology I w/Lab Exam
Q&A | Portage Learning
1. Which of the following is the primary function of the endocrine system?
A) To provide rapid, short-term responses to stimuli via electrical signals
B) To regulate body functions through the release of chemical messengers called
hormones
C) To filter blood and remove waste products
D) To provide structural support and protection for the body
Correct Answer: To regulate body functions through the release of chemical
messengers called hormones
Rationale: The endocrine system's primary function is to regulate body functions
through the release of chemical messengers (hormones) into the bloodstream. The
nervous system provides rapid electrical signaling, the kidneys filter blood, and the
skeletal system provides structural support.
2. What is a hormone?
A) A chemical messenger that is released into the bloodstream and travels to target
cells
B) An electrical signal transmitted along a neuron
C) A digestive enzyme secreted by the pancreas
D) A structural protein found in connective tissue
Correct Answer: A chemical messenger that is released into the bloodstream and
travels to target cells
,Rationale: Hormones are chemical messengers that are secreted by endocrine
glands and transported via the bloodstream to target cells, where they bind to
specific receptors and elicit a response.
3. Which of the following is NOT a type of hormone based on chemical structure?
A) Steroid hormones
B) Peptide hormones
C) Amino acid-derived hormones
D) Carbohydrate hormones
Correct Answer: Carbohydrate hormones
Rationale: Hormones are classified chemically as steroid hormones (derived from
cholesterol), peptide/protein hormones (chains of amino acids), and amino acid-
derived hormones (modified single amino acids like epinephrine). Carbohydrate
hormones are not a recognized category.
4. A researcher is studying a hormone that is lipid-soluble. Which characteristic is
most consistent with this hormone?
A) It binds to receptors on the cell membrane
B) It requires a second messenger to exert its effects
C) It can pass through the plasma membrane and bind to intracellular receptors
D) It is rapidly degraded in the bloodstream
Correct Answer: It can pass through the plasma membrane and bind to intracellular
receptors
Rationale: Lipid-soluble hormones, such as steroid and thyroid hormones, can
diffuse through the plasma membrane and bind to receptors inside the cell, often
, directly affecting gene transcription. Water-soluble hormones bind to cell membrane
receptors and typically use second messengers.
5. Which of the following glands is known as the "master gland" because it controls
the activity of many other endocrine glands?
A) Thyroid gland
B) Adrenal gland
C) Pituitary gland
D) Pineal gland
Correct Answer: Pituitary gland
Rationale: The pituitary gland is often called the "master gland" because it secretes
hormones that regulate the function of other endocrine glands, including the thyroid,
adrenal glands, and gonads. Its activity is controlled by the hypothalamus.
6. What is the primary function of the hypothalamus in the endocrine system?
A) To produce insulin and glucagon
B) To secrete hormones that regulate the pituitary gland
C) To produce melatonin
D) To regulate calcium levels
Correct Answer: To secrete hormones that regulate the pituitary gland
Rationale: The hypothalamus is the link between the nervous and endocrine
systems. It produces releasing and inhibiting hormones that control the secretion of
hormones from the anterior pituitary gland. It also produces ADH and oxytocin,
which are stored and released by the posterior pituitary.
Q&A | Portage Learning
1. Which of the following is the primary function of the endocrine system?
A) To provide rapid, short-term responses to stimuli via electrical signals
B) To regulate body functions through the release of chemical messengers called
hormones
C) To filter blood and remove waste products
D) To provide structural support and protection for the body
Correct Answer: To regulate body functions through the release of chemical
messengers called hormones
Rationale: The endocrine system's primary function is to regulate body functions
through the release of chemical messengers (hormones) into the bloodstream. The
nervous system provides rapid electrical signaling, the kidneys filter blood, and the
skeletal system provides structural support.
2. What is a hormone?
A) A chemical messenger that is released into the bloodstream and travels to target
cells
B) An electrical signal transmitted along a neuron
C) A digestive enzyme secreted by the pancreas
D) A structural protein found in connective tissue
Correct Answer: A chemical messenger that is released into the bloodstream and
travels to target cells
,Rationale: Hormones are chemical messengers that are secreted by endocrine
glands and transported via the bloodstream to target cells, where they bind to
specific receptors and elicit a response.
3. Which of the following is NOT a type of hormone based on chemical structure?
A) Steroid hormones
B) Peptide hormones
C) Amino acid-derived hormones
D) Carbohydrate hormones
Correct Answer: Carbohydrate hormones
Rationale: Hormones are classified chemically as steroid hormones (derived from
cholesterol), peptide/protein hormones (chains of amino acids), and amino acid-
derived hormones (modified single amino acids like epinephrine). Carbohydrate
hormones are not a recognized category.
4. A researcher is studying a hormone that is lipid-soluble. Which characteristic is
most consistent with this hormone?
A) It binds to receptors on the cell membrane
B) It requires a second messenger to exert its effects
C) It can pass through the plasma membrane and bind to intracellular receptors
D) It is rapidly degraded in the bloodstream
Correct Answer: It can pass through the plasma membrane and bind to intracellular
receptors
Rationale: Lipid-soluble hormones, such as steroid and thyroid hormones, can
diffuse through the plasma membrane and bind to receptors inside the cell, often
, directly affecting gene transcription. Water-soluble hormones bind to cell membrane
receptors and typically use second messengers.
5. Which of the following glands is known as the "master gland" because it controls
the activity of many other endocrine glands?
A) Thyroid gland
B) Adrenal gland
C) Pituitary gland
D) Pineal gland
Correct Answer: Pituitary gland
Rationale: The pituitary gland is often called the "master gland" because it secretes
hormones that regulate the function of other endocrine glands, including the thyroid,
adrenal glands, and gonads. Its activity is controlled by the hypothalamus.
6. What is the primary function of the hypothalamus in the endocrine system?
A) To produce insulin and glucagon
B) To secrete hormones that regulate the pituitary gland
C) To produce melatonin
D) To regulate calcium levels
Correct Answer: To secrete hormones that regulate the pituitary gland
Rationale: The hypothalamus is the link between the nervous and endocrine
systems. It produces releasing and inhibiting hormones that control the secretion of
hormones from the anterior pituitary gland. It also produces ADH and oxytocin,
which are stored and released by the posterior pituitary.
