ATI TEAS Practice Science Test

Correct Answer: B

Rationale: The purpose of an electrocardiogram (ECG) is to display the heart's rate and rhythm. It measures the electrical activity of the heart, showing how well it is functioning. By analyzing the ECG waveform, healthcare providers can assess the heart's health, detect any abnormalities, and diagnose various heart conditions. It provides crucial information about the heart's electrical impulses, such as the heart rate, rhythm, and any potential irregularities like arrhythmias. Therefore, choice B is correct. Choices A, C, and D are incorrect because an ECG does not indicate the rate of blood flow, identify a person's blood group type, or determine cell type in a blood sample.

Correct Answer: A

Rationale: The correct answer is A: Amygdala. The amygdala is a key structure in the brain responsible for processing emotions, including fear and anxiety. When a person experiences anxiety attacks, the amygdala is often overactive. Targeting the amygdala with medication can help regulate its activity and reduce anxiety symptoms. The other choices (B: Parietal lobe, C: Hypothalamus, D: Sensory neuron) are not directly involved in regulating emotions like anxiety. The parietal lobe is mainly responsible for processing sensory information, the hypothalamus regulates functions like hunger and thirst, and sensory neurons transmit sensory information to the brain.

Correct Answer: B

Rationale: To convert grams to kilograms, we divide by 1000 since there are 1000 grams in a kilogram. Therefore, 1800 grams divided by 1000 equals 1.8 kilograms. Choice B is correct. Choice A is incorrect because 0.18 is the result of dividing by 10, not 1000. Choice C is incorrect as it is 10 times the correct answer. Choice D is incorrect as it is 100 times the correct answer.

Correct Answer: D

Rationale: The correct answer is D because killer T cells have receptors that can recognize specific proteins displayed on the surface of infected cells. This recognition is crucial for the immune system to target and destroy infected cells effectively. The other choices are incorrect because B cells do not flag infected cells with amino acids (A), viral RNA remnants are not used for recognition by killer T cells (B), and macrophages do not directly help in identifying infected cells for killer T cell response (C). Overall, choice D stands out as the most accurate explanation based on the mechanism of T cell recognition in the immune response.

Correct Answer: C

Rationale: The correct answer is C because fetal waste is passed down the umbilical cord to the mother's circulatory system. The developing fetus eliminates metabolic wastes primarily through the placenta, which acts as a filter between the fetal and maternal circulatory systems. Metabolic wastes from the fetus, such as carbon dioxide and urea, diffuse through the placenta into the mother's bloodstream for elimination by her kidneys and lungs. This process ensures that the fetus's metabolic wastes are effectively removed without burdening its own developing organs. Choices A, B, and D are incorrect: A: The developing fetus does produce metabolic wastes, which need to be eliminated for proper development. B: Fetal waste does not pass through the mother's digestive system; it would be harmful to both the mother and fetus. D: Fetal waste does not exit the mother's body via the vagina; this is not a mechanism for waste elimination in utero.