Nokea
PTH activates vitamin D, which aids in the absorption of:
- A. calcium.
- B. Vitamin C.
- C. iron.
- D. phosphate.
Correct Answer: A
Rationale: The correct answer is A: calcium. PTH (parathyroid hormone) activates vitamin D, which in turn helps in the absorption of calcium in the intestines. This is crucial for maintaining bone health and normal calcium levels in the blood. Vitamin C (Choice B) is not directly related to PTH or vitamin D in calcium absorption. Iron (Choice C) absorption is influenced by factors other than PTH and vitamin D. Phosphate (Choice D) absorption is primarily regulated by fibroblast growth factor 23 and not by PTH or vitamin D. Thus, the correct answer is A as it directly corresponds to the role of PTH and vitamin D in calcium absorption.
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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.
A nurse is taking care of a client with a parathyroid disorder. Which of the following nutrients does a client with hypoparathyroidism need more of?
- A. Potassium
- B. Calcium
- C. Magnesium
- D. Sodium
Correct Answer: B
Rationale: Clients with hypoparathyroidism need more calcium, as the condition involves low calcium levels due to insufficient parathyroid hormone.
Which of the following is NOT an action of insulin?
- A. Stimulates cellular absorption of glucose.
- B. Stimulates cellular usage of glucose for energy.
- C. Stimulates the breakdown of glycogen.
- D. Lowers blood glucose levels.
Correct Answer: C
Rationale: Rationale:
C is correct because insulin does not stimulate the breakdown of glycogen. Insulin promotes the storage of glucose as glycogen, not its breakdown. A, B, and D are incorrect because insulin does stimulate cellular absorption of glucose, usage of glucose for energy, and lowers blood glucose levels, respectively. Insulin's main role is to facilitate the uptake and storage of glucose, not its breakdown.
Steroid hormones exert their action by ________.
- A. entering the nucleus of a cell and initiating or altering the expression of a gene
- B. finding an appropriate cell receptor and initiating cAMP activity
- C. stimulating the synthesis of a glycogen
- D. increasing blood pressure
Correct Answer: A
Rationale: The correct answer is A because steroid hormones are lipid-soluble molecules that can pass through the cell membrane and bind to intracellular receptors in the nucleus. This binding activates or inhibits gene transcription, leading to changes in protein synthesis and cellular responses. Choice B is incorrect because cAMP activity is typically associated with peptide hormones, not steroid hormones. Choice C is incorrect because steroid hormones do not stimulate glycogen synthesis. Choice D is incorrect because steroid hormones do not directly affect blood pressure regulation.
A client, age 64, has complaints of frequent spells of fatigue and inability to sleep. She also reports hair loss and an allergy to seafood. Which of the following information is essential to consider before initiating a thyroid test for the client?
- A. Her age
- B. Complaints of fatigue and inability to sleep
- C. Allergy to seafood
- D. Hair loss
Correct Answer: C
Rationale: An allergy to seafood may indicate a potential iodine sensitivity, which is relevant when interpreting thyroid test results, as iodine is a key component in thyroid function.