What is the role of bile in digestion?

Correct Answer: B

Rationale: The correct answer is B) To emulsify fats. Bile, produced by the liver and stored in the gallbladder, plays a crucial role in digestion by emulsifying fats. Emulsification breaks down large fat globules into smaller droplets, increasing the surface area for enzymes to digest fats into fatty acids and glycerol more efficiently. This process aids in the absorption of fats and fat-soluble vitamins in the small intestine. Option A is incorrect because carbohydrates are primarily broken down by amylase enzymes in the mouth and small intestine. Option C is incorrect as the role of bile is not to neutralize stomach acid but to aid in fat digestion. Option D is incorrect as proteins are broken down by pepsin in the stomach and protease enzymes in the small intestine, not by bile. Educationally, understanding the role of bile in digestion is essential for students studying human anatomy and physiology, nutrition, or healthcare fields. It highlights the interconnectedness of various organs and substances in the digestive process and emphasizes the importance of each component in breaking down and absorbing nutrients for proper bodily function.

Correct Answer: B

Rationale: The correct answer is B: Gallbladder. The gallbladder is the organ that stores and concentrates bile produced by the liver. Bile is essential for the digestion of fats in the small intestine. The liver produces bile, which is then stored and concentrated in the gallbladder until it is released into the small intestine when needed. Choices A, C, and D are incorrect because the liver produces bile, the pancreas produces digestive enzymes, and the stomach is primarily involved in the digestion of food through acid secretion and mechanical processes, not in storing bile.

Correct Answer: A

Rationale: The correct answer is A, 'Skin.' The skin is the largest organ in the human body and consists of multiple tissue types working together to perform various functions such as protection, sensation, and temperature regulation. Choice B, 'Neuron,' is a specialized cell in the nervous system and not an organ. Choice C, 'Brainstem,' is a part of the central nervous system composed of nerve tissues but is not an organ on its own. Choice D, 'DNA,' is a molecule that carries genetic instructions, not an organ.

Correct Answer: B

Rationale: Thyroxine, also known as T4, is produced by the thyroid gland and plays a vital role in regulating the body's metabolism. Insulin is not responsible for regulating metabolism; instead, it helps regulate blood sugar levels. Melatonin is involved in regulating sleep-wake cycles, not metabolism. Adrenaline, also known as epinephrine, is a stress hormone that prepares the body for fight or flight responses, not primarily involved in metabolic regulation.

Correct Answer: A

Rationale: Insulin is the hormone responsible for regulating blood sugar levels by facilitating the uptake of glucose into cells. Insulin helps lower blood sugar levels by promoting the storage of glucose in the liver, muscle, and fat cells. Adrenaline, cortisol, and melatonin do not directly regulate blood sugar levels. Adrenaline is involved in the fight-or-flight response, cortisol is a stress hormone that affects metabolism, immune response, and anti-inflammatory actions, while melatonin regulates sleep-wake cycles.