ati teas 7 science

Correct Answer: B

Rationale: The correct answer is B: Abdomen. The spleen is a large lymphatic organ located in the upper left quadrant of the abdomen, below the diaphragm and behind the stomach. Its main function is to filter blood, store blood cells, and assist in immune response. The other choices (A: Chest, C: Pelvis, D: Head and neck) are incorrect because the spleen is not located in these areas anatomically. The spleen's specific location in the abdomen is crucial for its functions and interactions with other organs in the abdominal cavity.

Correct Answer: B

Rationale: The correct answer is B: Lactic acid. When creatine phosphate is used as an energy source for short bursts of muscle activity, it is rapidly broken down into creatine and phosphate. The breakdown of creatine phosphate leads to the production of lactic acid through anaerobic glycolysis. Lactic acid accumulation causes muscle fatigue during intense exercise. A: Glucose is not the breakdown product of creatine phosphate. Glucose is a common fuel for cellular respiration but is not directly produced from creatine phosphate breakdown. C: Carbon dioxide is not the breakdown product of creatine phosphate. Carbon dioxide is produced during the Krebs cycle in aerobic respiration, not from the breakdown of creatine phosphate. D: Creatine is not the breakdown product of creatine phosphate. Creatine is one of the compounds formed when creatine phosphate is broken down, but it is not the final breakdown product.

Correct Answer: B

Rationale: Platelets are responsible for blood clotting, which is crucial for preventing excessive bleeding when a blood vessel is injured. They adhere to the site of injury and form a plug to stop bleeding. This function is essential for maintaining hemostasis in the body. Platelets do not carry oxygen like red blood cells (Choice A), fight infection like white blood cells (Choice C), or transport nutrients like plasma (Choice D).

Correct Answer: C

Rationale: Renin is the correct answer. Renin is an enzyme released by the kidneys in response to low blood pressure. It plays a key role in regulating blood pressure by initiating a series of reactions that ultimately lead to the constriction of blood vessels and retention of water and sodium. This helps to raise blood pressure back to normal levels. Insulin (choice A) is involved in regulating blood sugar levels, not blood pressure. Testosterone (choice B) and Estrogen (choice D) are sex hormones that do not have a direct impact on kidney function and blood pressure regulation.

Correct Answer: C

Rationale: The correct answer is C: Luteinizing hormone (LH). LH surge triggers ovulation by causing the mature ovarian follicle to release the egg. Estrogen and progesterone play important roles in regulating the menstrual cycle but are not the primary triggers for ovulation. FSH stimulates the growth of ovarian follicles but does not directly trigger ovulation.