ati teas 7 science

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: B

Rationale: The correct answer is B: Tendons. Tendons are tough connective tissues that attach skeletal muscles to bones. They transmit the force generated by muscles to the bones, allowing movement. Ligaments (A) connect bones to other bones, not muscles. Cartilage (C) is a firm, flexible connective tissue found in joints, not directly involved in muscle attachment. Fascia (D) is a connective tissue that surrounds muscles, but it does not directly attach muscles to bones.

Correct Answer: C

Rationale: The correct answer is C: Nucleus. The nucleus is responsible for controlling the activities of the cell because it houses the cell's DNA, which contains instructions for cellular functions. It regulates gene expression and controls the production of proteins. The Golgi apparatus (choice A) is involved in processing and packaging proteins. Mitochondria (choice B) are responsible for energy production. Ribosomes (choice D) are responsible for protein synthesis. However, the nucleus is the main organelle that directly regulates and controls the activities of the cell.

Correct Answer: B

Rationale: The primary function of red blood cells is to transport oxygen. They contain hemoglobin, which binds to oxygen in the lungs and delivers it to tissues throughout the body. This process is essential for cellular respiration and energy production. Choice A is incorrect because while red blood cells do transport nutrients, their main role is oxygen transport. Choice C is incorrect because fighting infection is primarily the role of white blood cells. Choice D is incorrect as red blood cells do not produce antibodies; that is the function of specialized white blood cells called B cells.

Correct Answer: A

Rationale: The correct answer is A because the atomic number represents the number of protons in the nucleus of an atom, which determines the element's identity. The mass number is the total number of protons and neutrons in the nucleus, indicating the atom's mass. The number of electrons is not directly related to either the atomic or mass number, eliminating choices B and D. Choice C is incorrect because the atomic number specifically refers to the number of protons, not neutrons. Thus, choice A is the only accurate explanation of the difference between the atomic number and the mass number.