ati teas 7 science

Correct Answer: C

Rationale: The correct answer is C: Nasal passages. Nasal passages contain mucous membranes that produce mucus to humidify and warm inhaled air. The mucus traps particles and adds moisture to the air, making it easier for the lungs to absorb oxygen. The trachea (A) is a passageway for air but does not actively humidify or warm it. The larynx (B) is responsible for sound production and protecting the airway, not for conditioning air. The bronchi (D) are branching airways that lead from the trachea to the lungs, but they do not play a direct role in humidifying or warming inhaled air.

Correct Answer: C

Rationale: The Law of Conservation of Energy states that energy cannot be created or destroyed, only transferred or transformed within a closed system. Therefore, the total amount of energy in a closed system remains constant over time. This is because energy is conserved and does not disappear or appear out of nowhere. The other choices are incorrect because energy does not increase (choice A) or decrease (choice B) in a closed system unless energy is coming in or going out of the system. The total energy in a closed system is independent of the temperature of the system (choice D) and is solely determined by the initial energy within the system and any energy transfers or transformations that occur within it.

Correct Answer: B

Rationale: The correct answer is B: Alveoli. Alveoli are tiny air sacs in the lungs where gas exchange occurs between the air in the lungs and the blood. Oxygen from the air enters the blood, and carbon dioxide from the blood exits into the air. Trachea (A) is the windpipe that carries air to and from the lungs. Bronchi (C) are the main airways that branch off from the trachea. Diaphragm (D) is a muscle that helps with breathing by expanding and contracting the lungs, but it is not directly involved in gas exchange.

Correct Answer: B

Rationale: The correct answer is B because not all fungi are parasitic and harmful to humans. Some fungi are beneficial, while others are neutral. A is correct as fungi can be unicellular or multicellular. C is true as fungi are crucial in breaking down organic matter. D is accurate as some fungi, such as mushrooms, are consumed as food. Overall, choice B is false because it wrongly generalizes all fungi as harmful, which is not the case.

Correct Answer: B

Rationale: The correct answer is B: Acting as a protective sac surrounding the heart. The pericardium is a double-walled sac that surrounds and protects the heart. It provides physical protection against external forces and prevents overfilling of the heart. Choices A, C, and D are incorrect as they do not accurately describe the function of the pericardium. Choice A refers to the role of heart valves, choice C refers to the role of the heart's electrical system, and choice D refers to the function of the atrioventricular node.