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Adam has just been diagnosed with diabetes insipidus. The most common presenting sign is:
- A. Body wasting.
- B. Hyperglycemia.
- C. Hypoglycemia.
- D. Increase in urination.
Correct Answer: D
Rationale: The hallmark symptom of diabetes insipidus is polyuria (excessive urination), which occurs due to the kidney's inability to concentrate urine.
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Which is NOT part of the normal content of gastric juice?
- A. HPO42-
- B. mucus
- C. lipase
- D. amylase
Correct Answer: D
Rationale: The correct answer is D: amylase. Gastric juice primarily consists of hydrochloric acid, pepsin, and mucus. Amylase is an enzyme produced in the pancreas, not in the stomach. It functions in the small intestine to break down carbohydrates. Therefore, amylase is not a normal component of gastric juice. Choices A, B, and C are incorrect because HPO42- (phosphate ions), mucus, and lipase are all typically found in gastric juice.
Which two elements react together to form an ionic compound?
- A. R and T
- B. T and X
- C. X and Z
- D. Z and R
Correct Answer: C
Rationale: The correct answer is C, X and Z. Ionic compounds are formed when a metal (X) reacts with a nonmetal (Z) by transferring electrons to achieve a stable octet configuration. Metal atoms tend to lose electrons to form positively charged cations, while nonmetal atoms tend to gain electrons to form negatively charged anions. In this case, X (metal) and Z (nonmetal) will react to form an ionic compound through electron transfer. Choices A, B, and D are incorrect because they do not involve a metal-nonmetal combination, which is essential for the formation of an ionic compound.
Regarding iron:
- A. it is more readily absorbed in the ferric form
- B. men lose about 0.6mg/d
- C. average daily iron intake is 40mg
- D. ascorbic acid reduces iron absorption
Correct Answer: B
Rationale: The correct answer is B because men lose about 0.6mg of iron per day through various physiological processes like shedding skin cells and hair. This loss must be replenished through dietary intake to maintain iron balance. Choice A is incorrect as iron is more readily absorbed in the ferrous form. Choice C is incorrect as the average daily iron intake is around 18mg. Choice D is incorrect ascorbic acid enhances iron absorption rather than reducing it.
The endocrine system works together with the ________ system to maintain the body’s equilibrium?
- A. digestive system
- B. nervous system
- C. respiratory system
- D. reproductive system
Correct Answer: B
Rationale: The correct answer is B: nervous system. The endocrine system and nervous system work together in maintaining the body's equilibrium through communication and regulation of bodily functions. The nervous system controls rapid responses, while the endocrine system regulates slower, long-term responses through hormones. The digestive system (A) primarily focuses on breaking down food and absorbing nutrients. The respiratory system (C) is responsible for gas exchange. The reproductive system (D) is involved in reproduction and hormone production, but not in maintaining the body's equilibrium.
The rate of metabolism of all body cells is regulated by _______.
- A. parathyroid hormone
- B. aldosterone
- C. calcitonin
- D. thyroid hormone
Correct Answer: D
Rationale: The correct answer is D: thyroid hormone. Thyroid hormone plays a crucial role in regulating the rate of metabolism in all body cells by influencing the production of enzymes involved in energy production. It increases the body's metabolic rate, affecting processes such as heart rate, temperature regulation, and energy expenditure. Parathyroid hormone (A) regulates calcium levels, aldosterone (B) regulates electrolyte balance, and calcitonin (C) regulates calcium metabolism, but they do not directly influence overall metabolism rate in all body cells. Thyroid hormone is the primary hormone responsible for controlling metabolism throughout the body.