TEAS 7 Science Practice Test

Correct Answer: D

Rationale: The correct answer is D because a control group is necessary in experiments to compare results with a group that does not receive the experimental treatment. In this case, if tanks A, B, or C were chosen as the control group, there would be no basis for comparison with a group that did not receive any treatment. Therefore, without a specific control group that does not undergo any experimental manipulation, it is not possible to determine the true impact of the treatment being tested. Tanks A, B, and C cannot serve as the control group in this experiment as they are all part of the experimental setup and are not kept untreated for comparison.

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: 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: B

Rationale: The correct answer is B: medulla oblongata. This region of the brain is responsible for controlling and regulating autonomic functions like respiration, digestion, and heart rate. It is located in the brainstem and contains vital centers for these functions. The cerebellum (A) is primarily involved in coordination and balance. The temporal lobe (C) is responsible for auditory processing and memory. The cerebral cortex (D) is involved in higher cognitive functions like thinking and decision-making. Therefore, the medulla oblongata is the correct choice as it specifically controls autonomic functions.

Correct Answer: A

Rationale: The correct answer is A: left atrium. During pulmonary circulation, oxygenated blood returns from the lungs to the heart. This oxygenated blood enters the heart through the pulmonary veins and specifically flows into the left atrium. The left atrium then contracts to push this oxygen-rich blood into the left ventricle, which pumps it out to the rest of the body. Summary: - B: right atrium receives deoxygenated blood from the body, not the lungs. - C: left ventricle receives blood from the left atrium, not directly from the lungs. - D: right ventricle pumps deoxygenated blood to the lungs, not receive blood from the lungs.