ati teas 7 science

Correct Answer: C

Rationale: The correct answer is C because the main function of the pancreas is to produce enzymes that help digest food. These enzymes are released into the small intestine to break down carbohydrates, proteins, and fats. Choice A is incorrect as the pancreas does not store or break down food. Choice B is incorrect as nutrient absorption primarily occurs in the small intestine, not the pancreas. Choice D is incorrect as regulating blood sugar levels is primarily the role of the endocrine portion of the pancreas, not its main function.

Correct Answer: B

Rationale: The correct answer is B: Liver. The liver is responsible for detoxifying chemicals and metabolizing drugs due to its enzymes that break down substances. It also helps in excreting waste products. The kidneys (A) filter blood and regulate fluid balance. The heart (C) pumps blood throughout the body. The pancreas (D) produces digestive enzymes and insulin. Thus, the liver is the primary organ involved in detoxification and drug metabolism.

Correct Answer: B

Rationale: Peristalsis is the correct answer. It is the term for the involuntary muscle contractions that move food through the digestive tract. These contractions help propel food along the digestive system. Segmentation is the process of breaking down food by mixing it with digestive juices. Chyme is the semi-fluid mass of partly digested food in the stomach and intestines. Emulsification is the breakdown of fats into smaller droplets for easier digestion. But none of these terms specifically refer to the muscle contractions that move food through the digestive tract like peristalsis does.

Correct Answer: A

Rationale: The correct answer is A: Hypothesis. In the scientific method, a scientist creates a hypothesis based on observations or research. A model can be a representation or simulation of a process or system that helps in understanding or predicting outcomes. By creating a model during the hypothesis step, the scientist can visually or conceptually test their proposed explanation or prediction. This aids in designing experiments or gathering data to test the hypothesis further. Data analysis (B) occurs after experimentation, where collected data is analyzed. Experimentation (C) involves testing the hypothesis through controlled experiments. Conclusion (D) is the final step where the scientist interprets the results.

Correct Answer: B

Rationale: The correct answer is B: Ammonia (NH₃). Ammonia is a common base found in household products due to its ability to accept protons and increase the pH of solutions. It is commonly used in cleaning products such as glass cleaners and floor cleaners. A: Sodium chloride (NaCl) is a salt and not a base. C: Vinegar is acidic due to the presence of acetic acid. D: Lemon juice is also acidic due to the presence of citric acid. Therefore, B is the correct answer as it is a common base found in household products, while the other choices are either salts or acidic substances.