Nokea
The largest endocrine gland(s) that makes 3 hormones that affect the metabolism is the:
- A. pancreas
- B. adrenal glands
- C. thyroid gland
- D. pituitary gland
Correct Answer: C
Rationale: The correct answer is C: thyroid gland. The thyroid gland is the largest endocrine gland that produces 3 hormones (T3, T4, and calcitonin) that regulate metabolism. T3 and T4 control the body's metabolic rate, while calcitonin helps regulate calcium levels in the blood. The pancreas (A) primarily produces insulin and glucagon to regulate blood sugar levels. The adrenal glands (B) produce hormones like cortisol and adrenaline to regulate stress response. The pituitary gland (D) controls various other endocrine glands but does not primarily produce hormones affecting metabolism.
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The antagonistic hormone to aldosterone is ____.
- A. atrial natriuretic hormone (ANH).
- B. antidiuretic hormone (ADH).
- C. cortisol.
- D. glucagon.
Correct Answer: A
Rationale: The correct answer is A: atrial natriuretic hormone (ANH). ANH opposes the actions of aldosterone by promoting salt and water excretion, thus reducing blood volume and blood pressure. ANH is released in response to high blood pressure or high blood volume.
B: antidiuretic hormone (ADH) is not the antagonistic hormone to aldosterone; it acts on the kidneys to regulate water balance.
C: cortisol is a stress hormone and is not directly involved in regulating sodium and water balance.
D: glucagon is a hormone that increases blood sugar levels and is not related to the regulation of aldosterone.
Hypothyroidism in children:
- A. Cretinism
- B. Myxoedema
- C. Graves disease
- D. Acromegaly
Correct Answer: A
Rationale: The correct answer is A: Cretinism. Cretinism is a condition of severe hypothyroidism during childhood, leading to stunted growth, intellectual disability, and physical deformities. Myxoedema refers to severe hypothyroidism in adults, not children. Graves disease is a form of hyperthyroidism, opposite of hypothyroidism. Acromegaly is a condition caused by excess growth hormone, not related to thyroid dysfunction. Therefore, Cretinism is the correct answer for hypothyroidism in children due to its specific characteristics and presentation.
Glucagon, growth hormone, cortisol, and epinephrine:
- A. are all secreted by the adrenal gland.
- B. expand blood volume.
- C. raise blood glucose levels.
- D. stimulate osteoclastic activity.
Correct Answer: C
Rationale: The correct answer is C: raise blood glucose levels. Glucagon, growth hormone, cortisol, and epinephrine all work together to increase blood glucose levels through various mechanisms. Glucagon stimulates the breakdown of glycogen into glucose, growth hormone promotes gluconeogenesis, cortisol increases blood sugar through gluconeogenesis and inhibiting glucose uptake, and epinephrine triggers glycogen breakdown and inhibits insulin release. Choices A, B, and D are incorrect because not all of these hormones are secreted by the adrenal gland, they do not directly expand blood volume, and they do not stimulate osteoclastic activity, respectively.
Hormones are produced by which of the following systems?
- A. Exocrine system
- B. Digestive system
- C. Endocrine system
- D. Nervous system
Correct Answer: C
Rationale: The correct answer is C, the Endocrine system. Hormones are chemical messengers produced by endocrine glands and released into the bloodstream to regulate various bodily functions. The exocrine system (A) secretes substances through ducts, not hormones. The digestive system (B) processes food and absorbs nutrients but does not produce hormones. The nervous system (D) controls body functions through electrical signals, not hormonal regulation. Therefore, the Endocrine system is the correct choice for hormone production.
Excess growth hormone would cause all the following EXCEPT __________.
- A. diabetes
- B. suppression of cancer
- C. giantism in children
- D. acromegally in adults
Correct Answer: B
Rationale: Excess growth hormone suppresses cancer by promoting healthy cell growth and inhibiting apoptosis. Diabetes can result from growth hormone excess due to insulin resistance. Giantism in children and acromegaly in adults are both caused by excess growth hormone stimulating excessive skeletal and soft tissue growth. Therefore, the correct answer is B because excess growth hormone does not suppress cancer; it actually promotes cell growth and proliferation.