ATI TEAS Science

Correct Answer: A

Rationale: Platelets are responsible for clotting by forming a plug at the site of injury. They release chemicals to initiate clotting cascades. Red blood cells transport oxygen, antigens are markers on cells, and plasma cells are involved in immune response, not clotting. Therefore, the correct answer is A.

Correct Answer: B

Rationale: The correct answer is B: The pelvic cavity. The pelvic cavity is located in the lower part of the trunk and houses the urinary bladder, urethra, and ureters. The thoracic cavity (A) contains the heart and lungs, the abdominal cavity (C) contains the stomach, liver, and intestines, and the spinal cavity (D) houses the spinal cord. Therefore, B is the correct answer as it specifically contains the organs mentioned in the question.

Correct Answer: A

Rationale: Platelets are responsible for clotting by forming a plug at the site of injury. They release chemicals to initiate clotting cascades. Red blood cells transport oxygen, antigens are markers on cells, and plasma cells are involved in immune response, not clotting. Therefore, the correct answer is A.

Correct Answer: D

Rationale: The correct answer is D: Arteries. Arteries carry oxygen-rich blood away from the heart to the body tissues. They have thick, muscular walls to withstand the high pressure of blood pumped from the heart. Veins (A) carry oxygen-poor blood back to the heart. Intestines (B) are part of the digestive system, and bronchioles (C) are small air passages in the lungs.

Correct Answer: A

Rationale: To represent 8,600,000,000,000 in scientific notation with two significant figures, we need to move the decimal point to have one non-zero digit before it. Step 1: Write the number in scientific notation: 8.6 x 10^12 Step 2: Check the significant figures: 8.6 has two significant figures. Step 3: Ensure the exponent matches the number of zeros in the original number. Rationale: Choice A is correct as it follows the rules for converting a number to scientific notation with two significant figures. Choices B, C, and D are incorrect because they do not correctly represent the original number in scientific notation with two significant figures. Choice B has the incorrect sign for the exponent, choice C has the incorrect exponent value, and choice D has an unnecessary zero after the decimal point.