If a person's breathing and heartbeat stop, brain damage can occur within ______ minutes.

Correct Answer: A

Rationale: The correct answer is A (4-6 minutes). When breathing and heartbeat stop, oxygen supply to the brain is cut off. Without oxygen, brain cells begin to die within 4-6 minutes, leading to brain damage. This time frame is critical for performing CPR to restore oxygen flow. Choice B (8-0) is incorrect as it does not align with the medical consensus on brain damage timeline without oxygen. Choice C (0-5) is incorrect as it inaccurately suggests brain damage can occur within seconds, which is not supported by medical knowledge. Choice D (5-20) is incorrect as it extends the time frame beyond what is generally accepted in medical emergency protocols.

Correct Answer: A

Rationale: The correct answer is A: Sims'. In Sims' position, the resident lies on the left side with the lower arm behind the back and the upper knee flexed. This position is often used for rectal exams or to increase comfort and facilitate drainage. Prone position (B) is lying face down. Fowler's position (C) is sitting up at a 45-90 degree angle. Supine position (D) is lying flat on the back. Sims' position is the only one among the choices that matches the described posture, making it the correct answer.

Correct Answer: B

Rationale: The correct answer is B: Cool. Rinsing and storing dentures in cool water helps prevent warping or damage to the acrylic material. Warm or hot water can distort the shape of the dentures, while boiling water can cause them to lose their shape or become brittle. Cool water is recommended to maintain the integrity of dentures.

Correct Answer: B

Rationale: The correct answer is B: High blood pressure. Hypertension is defined as consistently elevated blood pressure levels. High fever (A) is not synonymous with hypertension. High pulse rate (C) may be a symptom of hypertension but not the defining characteristic. Low blood pressure (D) is the opposite of hypertension. Therefore, based on the definition and characteristics of hypertension, choice B is the correct answer.

Correct Answer: D

Rationale: The correct angle for residents to be positioned for eating is 90 degrees. This allows for optimal upright posture and aids in swallowing and digestion. Sitting at 90 degrees helps prevent choking and aspiration. Choice A (180 degrees) is lying flat, which increases the risk of choking. Choices B (120 degrees) and C (100 degrees) are not optimal angles for proper swallowing and digestion, leading to potential health issues.