ATI TEAS 7 Science

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: D

Rationale: The correct answer is D: Tensile strength. Dense irregular connective tissue, found in tendons and ligaments, is composed of collagen fibers arranged in a random pattern, providing resistance to tension in multiple directions. This structural arrangement allows tendons and ligaments to withstand pulling forces and maintain their shape, ultimately providing tensile strength. Explanation: A: Flexibility - While tendons and ligaments do require some degree of flexibility, their primary function is to provide strength and stability rather than flexibility. B: Lubrication - Lubrication is not a primary function of dense irregular connective tissue in tendons and ligaments. C: Insulation - Dense irregular connective tissue does not primarily serve as an insulating material in tendons and ligaments; its main function is to provide mechanical support and strength. In summary, the correct answer is D because dense irregular connective tissue in tendons and ligaments is specifically designed to provide tensile strength by resisting pulling forces and

Correct Answer: B

Rationale: The correct answer is B: In a covalent bond, the shared electrons spend more time closer to the more electronegative atom. This is because the more electronegative atom attracts the electrons more strongly, causing them to be closer to that atom. This creates a partial negative charge on the more electronegative atom and a partial positive charge on the other atom. This distribution of electron density contributes to the stability of the covalent bond. Choices A, C, and D are incorrect because: A: Are completely transferred to one atom - This describes an ionic bond, not a covalent bond. C: Remain equidistant between the two atoms - Shared electrons in a covalent bond are not equidistant but are closer to one atom. D: Do not influence the bond strength - The distribution of shared electrons significantly influences the strength and properties of a covalent bond.

Correct Answer: A

Rationale: The primary function of the coronary arteries is to carry oxygenated blood to the heart muscle. This is essential for providing the heart muscle with the oxygen and nutrients it needs to function properly. Without adequate oxygen supply, the heart muscle can become damaged, leading to conditions like heart attacks. The other choices are incorrect because: B: Coronary arteries do not carry deoxygenated blood from the heart muscle; they supply oxygenated blood to it. C: Pumping blood to the lungs for oxygenation is the function of the pulmonary arteries, not the coronary arteries. D: Regulating blood pressure in the systemic circulation is primarily the function of the arteries and arterioles throughout the body, not specifically the coronary arteries.

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.