Correct Answer: B

Rationale: The correct answer is B: Dyspnea on exertion. In older clients, dyspnea on exertion is often the earliest symptom of heart failure due to decreased cardiac reserve. This occurs when the heart cannot pump enough blood to meet the body's demands during physical activity. Increased urine output (A) is not typically an early symptom of heart failure. Swollen joints (C) are more indicative of arthritis or inflammation, not necessarily heart failure. Nausea and vomiting (D) are not typical early symptoms of heart failure and are more commonly associated with gastrointestinal issues.

Correct Answer: C

Rationale: The correct answer is C: Dopamine. Parkinson's disease is primarily caused by a deficiency of dopamine in the brain, leading to the characteristic symptoms of bradykinesia, rigidity, and tremors. Dopamine is a neurotransmitter involved in movement control. Acetylcholine (Choice A) is not directly related to Parkinson's disease, although its imbalance can contribute to other movement disorders. Serotonin (Choice B) and Phenylalanine (Choice D) are not primarily involved in the pathophysiology of Parkinson's disease.

Correct Answer: C

Rationale: Rationale for Choice C (Correct answer): - In type II DM, there is some insulin present but it is insufficient to meet the body's needs. - Without sufficient insulin, the body turns to breaking down protein and fatty acids for energy. - This leads to the formation of ketones, which can lead to diabetic ketoacidosis (DKA). - Therefore, the primary reason a type II diabetic does not usually develop DKA is due to insufficient insulin to prevent the breakdown of protein and fatty acids for metabolic needs. Summary of other choices: - Choice A is incorrect because there is some insulin available in type II DM, though it may be insufficient. - Choice B is incorrect as type II diabetics do have fat and protein reserves. - Choice D is incorrect as insufficient serum glucose concentrations do not directly relate to the development of DKA in type II DM.

Correct Answer: C

Rationale: The correct answer is C because compatibility between blood donor and recipient is determined by the absence of clumping or hemolysis when both samples are mixed. Clumping indicates an incompatible blood type reaction, leading to potential harm. Blood clots (option B) are not indicative of compatibility but rather a sign of coagulation issues. Blood color change (option A) and blood drop sinking in water (option D) are not reliable indicators of blood compatibility. In summary, option C is correct as it directly assesses for the absence of a harmful reaction, while the other choices do not accurately determine blood compatibility.

Correct Answer: D

Rationale: The correct answer is D: Increased calcium level. Parathyroid hormone functions to increase blood calcium levels. When calcium levels are low, the parathyroid gland releases PTH to stimulate the release of calcium from bones and increase calcium absorption from the intestines and kidneys. This helps to maintain normal calcium levels in the blood. Choices A, B, and C are incorrect because decreased phosphate level, functioning thyroid gland, and adequate vitamin D level are not direct requirements for the action of parathyroid hormone.