ati teas 7 science

Correct Answer: A

Rationale: The correct answer is A: Epimysium. The epimysium is the outermost layer of connective tissue that surrounds the entire skeletal muscle. It provides protection and support to the muscle fibers within it. Perimysium (B) surrounds bundles of muscle fibers, while endomysium (C) surrounds individual muscle fibers. Myofibril (D) is not a connective tissue sheath but rather a structure within muscle fibers that contain contractile proteins. Therefore, A is the correct answer as it pertains to the sheath that surrounds the entire skeletal muscle.

Correct Answer: C

Rationale: The correct answer is C: Phagocytes. Phagocytes are white blood cells responsible for the initial attack on pathogens by engulfing and digesting them. They include neutrophils, monocytes, and macrophages. Red blood cells (A) are not involved in the immune response. Platelets (B) are responsible for blood clotting, not attacking pathogens. Lymphocytes (D) play a role in specific immune responses but are not the primary cells responsible for the initial attack on pathogens.

Correct Answer: A

Rationale: The correct answer is A: Pulmonary vein. The pulmonary vein is the only blood vessel among the choices that carries oxygenated blood from the lungs back to the heart. The pulmonary artery (B) carries deoxygenated blood from the heart to the lungs. The aorta (C) carries oxygenated blood from the heart to the rest of the body. The vena cava (D) carries deoxygenated blood from the body back to the heart. Therefore, the pulmonary vein is the only blood vessel in the list that fits the description of carrying oxygenated blood from the lungs to the heart.

Correct Answer: B

Rationale: Failed to generate a rationale after 5 retries.

Correct Answer: D

Rationale: In osmosis, solvent moves from an area of low solute concentration to high solute concentration to equalize concentration. This is due to the principle of diffusion where molecules move from high to low concentration. Choice D is correct as it aligns with this principle. Choice A is incorrect because osmosis involves solvent movement, not solute movement. Choices B and C are incorrect as temperature does not determine the direction of solvent movement in osmosis.