ati teas 7 science

Correct Answer: B

Rationale: When the force acting on an object is doubled, according to Newton's second law (F=ma), the acceleration of the object will also double. This is because acceleration is directly proportional to force when mass is constant. Therefore, the correct answer is B. Explanation for other choices: A: Acceleration is halved - Incorrect, doubling the force will increase acceleration, not decrease it. C: Acceleration remains unchanged - Incorrect, acceleration changes in direct proportion to force. D: Acceleration quadruples - Incorrect, acceleration only doubles when the force is doubled, not quadruples.

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: 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.

Correct Answer: C

Rationale: The primary function of the lymphatic system is to fight infection and remove excess fluid. Lymph nodes contain white blood cells that help fight pathogens. Lymphatic vessels collect excess fluid from tissues and transport it back to the bloodstream, aiding in immune response. Other choices are incorrect because A: Oxygen transport is primarily done by the circulatory system, B: Blood filtration is mainly carried out by the kidneys, and D: Hormone transport is primarily through the circulatory system.

Correct Answer: A

Rationale: The correct answer is A: Atom. An atom is the smallest unit of an element that retains its chemical properties. Atoms are composed of protons, neutrons, and electrons. Molecules (B) are made up of two or more atoms bonded together. Compounds (C) are substances composed of two or more different elements chemically bonded. Mixtures (D) are combinations of two or more substances that are physically mixed but not chemically bonded. Therefore, in this context, the correct answer is atom as it specifically refers to the smallest amount of an element that can exist independently with its unique chemical properties.