Question: Q: In what organ does pepsin help break down proteins? Read this paragraph and choose the correct option from the provided answers: Acids and bases are important in living things because most enzymes can do their job only at a certain level of acidity. Cells secrete acids and bases to maintain the proper pH for enzymes to work. For example, every time you digest food, acids and bases are at work in your digestive system. Consider the enzyme pepsin, which helps break down proteins in the stomach. Pepsin needs an acidic environment to do its job, and the stomach secretes a strong acid that allows pepsin to work. However, when stomach contents enter the small intestine, the acid must be neutralized. This is because enzymes in the small intestine need a basic environment in order to work. An organ called the pancreas secretes a strong base into the small intestine, and this base neutralizes the acid. Choices: - kidney - liver - skin - stomach A:
Answer: stomach

Question: Q: In humans, there are five primary tastes, and each taste has only one corresponding type of what? Read this paragraph and choose the correct option from the provided answers: In humans, there are five primary tastes, and each taste has only one corresponding type of receptor. Thus, like olfaction, each receptor is specific to its stimulus (tastant). Transduction of the five tastes happens through different mechanisms that reflect the molecular composition of the tastant. A salty tastant (containing NaCl) provides the sodium ions (Na+) that enter the taste neurons and excite them directly. Sour tastants are acids and belong to the thermoreceptor protein family. Binding of an acid or other sour-tasting molecule triggers a change in the ion channel and these increase hydrogen ion (H+). Choices: - organ - neuron - membrane - receptor A:
Answer: receptor

Question: Q: What supports and protects the soft organs of the body? Read this paragraph and choose the correct option from the provided answers: Protection. The skeleton supports and protects the soft organs of the body. For example, the skull surrounds the brain to protect it from injury. The bones of the rib cage help protect the heart and lungs. Choices: - Skin - skull - Muscle - skeleton A:
Answer:
skeleton