ATI TEAS Science

Correct Answer: D

Rationale: The correct answer is D because organisms maintain homeostasis by using free energy and matter to counteract entropy. This is achieved through various biochemical processes that regulate internal conditions within a narrow range to ensure stability. By utilizing energy and matter efficiently, organisms can balance their internal environment despite external fluctuations. Choice A is incorrect because increasing body temperature, blood pH, and fluid balance do not necessarily maintain homeostasis but rather reflect changes in the internal environment. Choice B is incorrect as absorbing energy to increase entropy would disrupt homeostasis rather than maintain it. Choice C is incorrect because maintaining the order of the external environment is not directly related to the internal balance required for homeostasis.

Correct Answer: D

Rationale: The correct answer is D because the autonomic nervous system (ANS) indeed contains both parasympathetic and sympathetic nerves. The ANS regulates involuntary functions such as heart rate, digestion, and respiratory rate. A: While A is partially correct, it does not encompass the full scope of the ANS functions. B: B is incorrect as the ANS primarily consists of efferent neurons that carry motor signals from the central nervous system to target organs. C: C is incorrect as the ANS consists of efferent neurons that carry signals away from the central nervous system to target organs, not sensory neurons.

Correct Answer: B

Rationale: Failed to generate a rationale after 5 retries.

Correct Answer: A

Rationale: The correct answer is A: The smallest amount of stimulus required for an individual to feel a sensation. The sensory threshold refers to the minimum level of stimulation needed for an individual to detect a particular sensation. This threshold varies from person to person and can be influenced by factors such as sensitivity and attention. Choice B is incorrect as it specifically relates to feeling pain, which is a different sensory experience. Choice C is incorrect as it refers to a response to a stimulus (movement) rather than the detection of sensation. Choice D is incorrect as it describes the origin of the stimulus rather than the threshold for sensation detection.

Correct Answer: A

Rationale: The correct answer is A: The renal pelvis. The renal pelvis acts like a funnel by collecting urine from the millions of collecting tubules and delivering it to the ureters for excretion. The renal cortex and medulla are not directly involved in the collection and transportation of urine. Bowman's capsule is part of the renal corpuscle and is involved in the initial filtration of blood to form urine, not in the delivery of urine to the ureters. Therefore, the renal pelvis is the correct choice as it specifically functions to collect and funnel urine towards the ureters.