TEAS 7 Science Practice Test

Correct Answer: A

Rationale: The correct answer is A because atomic radius generally increases from top to bottom within a group and decreases from left to right across a period on the periodic table. This trend is due to the increasing number of energy levels (shells) as you move down a group, leading to larger atomic radii. Moving from left to right across a period, atomic radius decreases due to increasing effective nuclear charge pulling the electrons closer to the nucleus. Choices B, C, and D are incorrect as they do not accurately describe the trend of atomic radius across the periodic table.

Correct Answer: A

Rationale: The correct answer is A. Progesterone is not responsible for the expression of secondary sexual characteristics, such as enlarged breasts. Progesterone's main functions in the female reproductive system are to regulate and prepare the endometrial lining of the uterus for potential pregnancy, inhibit contractions of the uterus as the ovum is released, and stimulate milk production in the breasts. Enlarged breasts are primarily influenced by estrogen, another hormone in the female reproductive system. Thus, A is the correct answer as it does not align with the known functions of progesterone.

Correct Answer: A

Rationale: The primary function of the pyloric sphincter is to regulate the movement of food material from the stomach to the duodenum. This is crucial for proper digestion as it controls the release of partially digested food into the small intestine for further processing. Choices B and D are incorrect because the pyloric sphincter does not neutralize stomach acid or begin the process of chemical digestion; those functions are carried out by other parts of the digestive system. Choice C is incorrect as preventing digested food materials and stomach acid from entering the esophagus is the primary role of the lower esophageal sphincter, not the pyloric sphincter.

Correct Answer: C

Rationale: The primary function of the large intestine is to absorb water and compact material into solid waste. This process helps in forming feces for elimination. Absorbing digested material into the blood (Choice A) is mainly done in the small intestine. Nutrient processing and metabolizing (Choice B) occur in various organs like the liver and kidneys, not primarily in the large intestine. Bile production and storage (Choice D) are functions of the liver and gallbladder, not the large intestine.

Correct Answer: D

Rationale: Peristalsis is the correct term as it refers to the rhythmic muscle contractions that propel food through the digestive tract. First, the circular muscles contract behind the food bolus, pushing it forward. Then, the longitudinal muscles contract, shortening the tract and pushing the food further. This process continues in a wave-like fashion, aiding in digestion. A: Digestion refers to the breakdown of food into smaller molecules. B: Deglutition is the process of swallowing food. C: Defecation is the elimination of waste from the body. Therefore, peristalsis is the correct term as it specifically describes the muscle contractions that move food through the digestive system.