ATI TEAS 7 Science

Correct Answer: B

Rationale: The correct answer is B: Kidneys. The kidneys are responsible for maintaining electrolyte balance through processes like reabsorption and excretion. They also filter waste from the blood to form urine. The liver primarily processes nutrients and detoxifies substances. The heart is responsible for pumping blood, not filtering waste. The lungs are involved in gas exchange, not electrolyte balance or waste filtration. Therefore, the kidneys are the correct choice for this function.

Correct Answer: A

Rationale: The correct answer is A: Stapes. The stapes is the smallest bone in the human body, located in the middle ear. It plays a crucial role in transmitting sound vibrations to the inner ear. The other choices are incorrect because the patella is a knee bone, phalanges are finger bones, and ribs are chest bones, none of which are the smallest bone in the body. The stapes' small size and specific location make it uniquely suited for its function in hearing.

Correct Answer: B

Rationale: The correct answer is B: Atom. An atom is the smallest unit of matter that retains the properties of an element. Atoms are made up of protons, neutrons, and electrons. A molecule (A) consists of two or more atoms bonded together. A compound (C) is a substance composed of two or more different elements chemically bonded. An element (D) is a pure substance made up of only one type of atom. Therefore, the smallest unit of matter is the atom.

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: To regulate hormones. The hypothalamus plays a crucial role in regulating hormone production and release from the pituitary gland, which in turn controls various bodily functions. It does not directly regulate digestion (A), body temperature (C), or the immune system (D). The hypothalamus is primarily involved in maintaining hormonal balance and coordinating the body's response to different stimuli.