Practice Science TEAS Test

Correct Answer: B

Rationale: The correct answer is B: To transport food from the mouth to the stomach. The esophagus serves as a muscular tube that carries chewed food (bolus) from the mouth to the stomach through peristalsis, a series of muscle contractions. It does not absorb nutrients (A), break down food (C), or absorb water (D). Absorption of nutrients primarily occurs in the small intestine, food breakdown begins in the mouth and continues in the stomach and small intestine, and water absorption happens mainly in the large intestine.

Correct Answer: B

Rationale: Rationale: Sulfur (atomic number 16) typically has 16 protons and 16 electrons in a neutral state. A negative ion gains an electron, so it would have 16 protons, 16 neutrons, and 17 electrons to maintain charge neutrality. Therefore, choice B (16 neutrons, 17 electrons) is correct. Choices A, C, and D are incorrect as they do not account for the addition of an extra electron in the negative ion, resulting in an incorrect number of electrons.

Correct Answer: B

Rationale: The correct answer is B: To transport food from the mouth to the stomach. The esophagus serves as a muscular tube that carries chewed food (bolus) from the mouth to the stomach through peristalsis, a series of muscle contractions. It does not absorb nutrients (A), break down food (C), or absorb water (D). Absorption of nutrients primarily occurs in the small intestine, food breakdown begins in the mouth and continues in the stomach and small intestine, and water absorption happens mainly in the large intestine.

Correct Answer: B

Rationale: The correct answer is B: Serotonin. Serotonin is associated with feelings of happiness and well-being because it helps regulate mood, emotions, and sleep. Low levels of serotonin have been linked to depression and anxiety. Dopamine (A) is associated with pleasure and reward, GABA (C) is an inhibitory neurotransmitter that helps reduce anxiety, and Acetylcholine (D) is involved in muscle movement and memory. Serotonin is the most relevant neurotransmitter for happiness and well-being due to its specific role in regulating mood and emotions.

Correct Answer: D

Rationale: Step-by-step rationale: 1. A: The atrioventricular valves lie between the atria and the ventricles - This is true for both the tricuspid valve (right side) and the mitral valve (left side). 2. B: The pulmonary semilunar valve lies between the right ventricle and the pulmonary trunk - This is accurate, as the pulmonary semilunar valve separates the right ventricle from the pulmonary artery. 3. C: The atrioventricular valves prevent backflow into the atria when the ventricles contract - This is true as the AV valves close to prevent backflow during ventricular contraction. 4. Therefore, the correct answer is D, as all the statements are correct and accurately describe heart valve anatomy and function.