Which is a water soluble vitamin?

Correct Answer: B

Rationale: The correct answer is B: B12. B12 is a water-soluble vitamin because it dissolves in water and can be easily excreted through urine if taken in excess. It plays a crucial role in red blood cell formation and neurological function. Vitamins D, A, and K are fat-soluble vitamins, meaning they require fat for absorption and are stored in the body's fat tissues, making it harder to excrete excess amounts. This is why B12 is the only water-soluble vitamin among the choices.

Correct Answer: D

Rationale: Basal metabolic rate (BMR) is the energy expended by the body at rest to maintain basic physiological functions. Choice D is correct because it states that BMR is about 40Kcal/m2/h in an average man, which is a commonly accepted value. This is based on the energy needed for essential bodily functions such as breathing, circulation, and cell production. Choices A, B, and C are incorrect because: A) BMR is generally higher in men due to their higher muscle mass; B) BMR is measured after an overnight fast, not within 12 hours after the last meal; C) Fever typically increases BMR by around 7% per 1°C rise, not 18%.

Correct Answer: C

Rationale: Correct Answer: C Rationale: 1. Endocrine glands are ductless: Endocrine glands release hormones directly into the bloodstream instead of using ducts. 2. Exocrine glands release secretions at the body's surface or into ducts: Exocrine glands release their secretions through ducts to the body's surface or specific locations. 3. Therefore, the key difference is the presence of ducts: Endocrine glands lack ducts, while exocrine glands have ducts for secretion. This distinction makes choice C the correct answer. Summary: A: Incorrect. Endocrine glands and exocrine glands can both be formed by epithelial tissue. B: Incorrect. Exocrine glands release enzymes and other substances, not waste products. D: Incorrect. There is no interconnection requirement for endocrine glands, and exocrine glands can also be interconnected.

Correct Answer: B

Rationale: The correct answer is B: oxytocin and antidiuretic hormone (ADH). 1. The posterior pituitary stores and releases oxytocin and ADH. 2. Oxytocin is responsible for uterine contractions and milk ejection. 3. ADH regulates water balance by controlling water reabsorption in the kidneys. Therefore, B is the correct answer. A, C, and D are incorrect because prolactin, growth hormone, and other hormones are not stored or released by the posterior pituitary.

Correct Answer: D

Rationale: The correct answer is D because the tongue is primarily involved in swallowing, mastication (chewing), and taste perception. Swallowing is a crucial function of the tongue as it helps move food towards the throat. Mastication involves the tongue's movement to mix food with saliva and initiate the digestion process. Taste buds on the tongue are responsible for detecting different flavors. Choices A, B, and C are incorrect as they do not accurately describe the key functions of the tongue.