TEAS 7 Science Practice Test

Correct Answer: B

Rationale: The correct answer is B: fallopian tube. Fertilization typically occurs in the fallopian tube because this is where the egg is typically fertilized by a sperm. The fallopian tube provides the ideal environment for fertilization to take place, with cilia helping to move the egg towards the uterus. The other choices are incorrect because fertilization does not occur in the uterus (choice A), endometrium (choice C), or ovary (choice D). The uterus is where the fertilized egg implants and develops into an embryo, the endometrium is the inner lining of the uterus, and the ovary is where the eggs are produced and released during ovulation.

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: A

Rationale: The correct answer is A: capillaries. Capillaries are tiny blood vessels where the exchange of oxygen and nutrients occurs between the blood and tissues through diffusion. Capillaries have thin walls to facilitate the exchange process efficiently. Veins carry blood back to the heart, ventricles are chambers of the heart, and arteries carry blood away from the heart. Thus, they are not sites for oxygen exchange between blood and tissues.

Correct Answer: B

Rationale: The primary function of the respiratory system is to facilitate the exchange of oxygen and carbon dioxide in the body. Step 1: During inhalation, oxygen is taken into the lungs. Step 2: Oxygen is then transported to the cells via the bloodstream. Step 3: Carbon dioxide, a waste product, is removed from the body during exhalation. This process is essential for cellular respiration and energy production. Choices A, C, and D are incorrect because speech production, nutrient transport, and organ protection are not the primary functions of the respiratory system.

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.