ati teas 7 science

Correct Answer: C

Rationale: The correct answer is C: Vitamin D. When the skin is exposed to sunlight, a form of cholesterol in the skin is converted into Vitamin D. This vitamin plays a crucial role in calcium absorption and bone health. Vitamin A is not synthesized in the skin but obtained through diet. Vitamin C is obtained from fruits and vegetables. Vitamin E is a fat-soluble vitamin found in nuts and seeds. In summary, only Vitamin D is synthesized in the skin upon sunlight exposure, making it the correct answer.

Correct Answer: B

Rationale: The correct answer is B: Edema. Edema is the condition characterized by swelling caused by a buildup of lymph fluid. Lymph fluid can accumulate in tissues due to various reasons such as lymphatic system blockages or underlying medical conditions. Anemia (A) is a condition characterized by a deficiency of red blood cells or hemoglobin. Hypertension (C) is high blood pressure, not related to lymph fluid buildup. Diabetes (D) is a metabolic disorder affecting blood sugar levels, not directly related to lymph fluid accumulation. In this case, edema is the most appropriate choice as it specifically addresses the swelling caused by lymph fluid buildup.

Correct Answer: C

Rationale: The correct answer is C: Peripheral nervous system. This system consists of nerves that connect the sensory organs (such as eyes, ears, skin) to the central nervous system (brain and spinal cord). It transmits sensory information from these organs to the CNS for processing. The autonomic nervous system (A) controls involuntary functions, somatic nervous system (B) controls voluntary movements, and central nervous system (D) processes and integrates information but does not directly transmit signals from sensory organs.

Correct Answer: C

Rationale: The correct answer is C: Change in color. Chemical reactions involve the formation of new substances, which is a key characteristic. Energy is either released or absorbed during a chemical reaction, leading to changes in temperature. However, changes in color are not always indicative of a chemical reaction as it can be influenced by factors like impurities or physical changes. Therefore, C is not a reliable characteristic of a chemical reaction compared to the other choices.

Correct Answer: B

Rationale: The correct answer is B: Alveoli. Alveoli are tiny air sacs in the lungs where gas exchange occurs between the air in the lungs and the blood. Oxygen from the air enters the blood, and carbon dioxide from the blood exits into the air. Trachea (A) is the windpipe that carries air to and from the lungs. Bronchi (C) are the main airways that branch off from the trachea. Diaphragm (D) is a muscle that helps with breathing by expanding and contracting the lungs, but it is not directly involved in gas exchange.