Nokea
Identify the glands associated with these hormones: gonadotropins, aldosterone, and epinephrine.
- A. Adenohypophysis, neurohypophysis, pancreas
- B. Adenohypophysis, anterior pituitary, adrenal cortex
- C. Adenohypophysis, posterior pituitary, adrenal medulla
- D. Anterior pituitary, adrenal cortex, adrenal medulla
Correct Answer: D
Rationale: The correct answer is D because gonadotropins are secreted by the anterior pituitary gland, aldosterone is produced by the adrenal cortex, and epinephrine is released by the adrenal medulla. The anterior pituitary gland secretes gonadotropins such as FSH and LH. The adrenal cortex synthesizes aldosterone, which regulates sodium and potassium balance. The adrenal medulla produces epinephrine, involved in the fight or flight response. Choices A and C are incorrect because they do not match the correct associations of the hormones with their respective glands. Choice B is incorrect as the adrenal cortex and adrenal medulla are not part of the anterior pituitary gland.
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Which patient should the nurse plan to teach how to prevent or delay the development of diabetes?
- A. An obese 50-year-old Hispanic woman
- B. A child whose father has type 1 diabetes
- C. A 34-year-old woman whose parents both have type 2 diabetes
- D. A 12-year-old boy whose father has maturity onset diabetes of the young (MODY)
Correct Answer: A
Rationale: An obese 50-year-old Hispanic woman is at high risk for developing type 2 diabetes and would benefit from education on prevention.
Which gland is often referred to as the 'master gland'?
- A. Pituitary
- B. Thyroid
- C. Thymus
- D. Hypothalamus
Correct Answer: A
Rationale: The pituitary gland is often referred to as the 'master gland' because it plays a crucial role in regulating other endocrine glands in the body. It secretes hormones that control various bodily functions, such as growth, reproduction, and metabolism. The other choices, thyroid, thymus, and hypothalamus, are important glands as well, but they do not have the same broad control over the endocrine system as the pituitary gland. The thyroid regulates metabolism, thymus is involved in immune function, and hypothalamus regulates body temperature, hunger, and thirst. However, none of these glands have the overall regulatory function and influence on other glands as the pituitary gland does.
The adrenal medulla:
- A. is an extension of the “feed-and-breed†division of the autonomic nervous system.
- B. secretes epinephrine and norepinephrine.
- C. secretes steroids.
- D. causes Cushing syndrome when it is overactive.
Correct Answer: B
Rationale: The correct answer is B because the adrenal medulla secretes epinephrine and norepinephrine, which are hormones involved in the body's response to stress or danger. These hormones help increase heart rate, blood pressure, and energy levels. Choices A, C, and D are incorrect because:
A: The adrenal medulla is actually part of the sympathetic division of the autonomic nervous system, which is responsible for the "fight-or-flight" response, not the "feed-and-breed" division.
C: Steroids are produced by the adrenal cortex, not the adrenal medulla.
D: Cushing syndrome is caused by overactivity of the adrenal cortex, not the adrenal medulla.
Most endocrine secretions are controlled by _____.
- A. positive feedback.
- B. negative feedback.
- C. neural feedback.
Correct Answer: B
Rationale: Step 1: Negative feedback is the primary mechanism in endocrine system regulation to maintain homeostasis.
Step 2: When hormone levels reach a certain set point, negative feedback signals the gland to stop producing that hormone.
Step 3: This ensures that hormone levels remain within a specific range.
Step 4: Positive feedback would lead to further hormone secretion, disrupting homeostasis.
Step 5: Neural feedback is not a common mechanism for regulating endocrine secretions.
Adonis arrives at the gym and spots a dumbbell he wants to use. When attempting to lift the weight, his biceps brachii contract, but the weight is not moved because it is too heavy. This is called?
- A. Isometric contraction
- B. Concentric contraction
- C. Eccentric contraction
- D. Incomplete tetanus
Correct Answer: a
Rationale: The correct answer is A: Isometric contraction. In isometric contraction, the muscle contracts but there is no movement at the joint. In this scenario, Adonis's biceps brachii contract but the weight is not moved, indicating an isometric contraction. In concentric contraction (B), the muscle shortens to move the weight upward. In eccentric contraction (C), the muscle lengthens while under tension, controlling the descent of the weight. Incomplete tetanus (D) refers to a state where muscle fibers are stimulated rapidly but not at the maximum rate to produce sustained contractions.