ATI TEAS 7
Practice TEAS Science Test
1. What is the role of the kidneys in the body?
- A. To regulate body temperature
- B. To filter waste from the blood
- C. To produce hormones
- D. To transport oxygen
Correct answer: B
Rationale: The correct answer is B: To filter waste from the blood. The kidneys play a crucial role in filtering waste products and excess substances from the blood to form urine, which helps maintain fluid balance and eliminate toxins from the body. Choice A is incorrect because regulating body temperature is primarily controlled by the skin and other mechanisms. Choice C is incorrect as hormone production is mainly attributed to other organs like the endocrine glands. Choice D is incorrect as the transportation of oxygen is primarily facilitated by the lungs and circulatory system, not the kidneys.
2. What does the P-wave in an ECG correspond to?
- A. Atrial repolarization
- B. Depolarization of SA node
- C. Ventricular depolarization
- D. Ventricular repolarization
Correct answer: B
Rationale: The P-wave in an ECG represents the depolarization of the SA node and the atria, not atrial repolarization. Choice C, ventricular depolarization, is incorrect because the P-wave does not correspond to ventricular activity. Choice D, ventricular repolarization, is also incorrect as the P-wave does not depict ventricular repolarization. The correct interpretation is that the P-wave signifies the initiation of the electrical impulse at the SA node and subsequent atrial depolarization, making option B the correct answer.
3. What is the role of bile in digestion?
- A. To break down carbohydrates
- B. To emulsify fats
- C. To neutralize stomach acid
- D. To absorb proteins
Correct answer: B
Rationale: Bile emulsifies fats, breaking them down into smaller droplets for easier digestion.
4. Which of the following structures is responsible for filtering lymph and supporting the immune system?
- A. Kidneys
- B. Lymph nodes
- C. Pancreas
- D. Liver
Correct answer: B
Rationale: Lymph nodes are responsible for filtering lymph and supporting the immune system. They contain immune cells that trap and destroy pathogens, making them crucial in immune response. The other choices, kidneys, pancreas, and liver, do not play a direct role in filtering lymph or supporting the immune system. The kidneys filter blood to remove waste and regulate electrolytes, the pancreas is involved in digestion and blood sugar regulation, and the liver is primarily responsible for detoxification and metabolism.
5. Which of the following antibodies can cross the placenta?
- A. IgA
- B. IgD
- C. IgG
- D. IgM
Correct answer: C
Rationale: The correct answer is IgG. IgG is the only antibody that can cross the placenta, providing passive immunity to the developing fetus. IgA, IgD, and IgM do not cross the placenta. IgA is mainly found in mucosal secretions, IgD is involved in the activation of B cells, and IgM is the first antibody produced in response to an infection, but it does not cross the placental barrier.
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