ATI TEAS Practice Science Test

Correct Answer: B

Rationale: The correct answer is B: Prone. Prone position allows access to the stomach as the patient lies on their stomach, facilitating examination or procedures on the abdominal area. In the prone position, the stomach is easily accessible for palpation or diagnostic tests. The other choices are incorrect because: A: Medial refers to the midline of the body and does not specifically provide access to the stomach. C: Superficial refers to the location near the surface and does not relate to positioning for stomach access. D: Supine refers to lying on the back, which is not ideal for direct access to the stomach.

Correct Answer: A

Rationale: The correct answer is A: ATP. ATP (adenosine triphosphate) is required to drive the sliding filament process during muscle contraction by providing energy for the myosin heads to bind to actin and generate movement. ATP is directly involved in the process of cross-bridge formation and power stroke. Hormones (B) do not directly drive muscle contraction. Potassium (C) is involved in muscle cell excitability but not in the sliding filament process. Water (D) is not directly involved in muscle contraction.

Correct Answer: C

Rationale: Rationale: 1. Aluminum has 13 electrons. 2. Based on the electron configuration rule (2n^2), the first shell can hold 2 electrons, the second shell can hold 8 electrons, and the third shell can hold 3 electrons. 3. Therefore, in a neutral aluminum atom, electrons are typically distributed as follows: 2 in the first shell, 8 in the second shell, and 3 in the third shell. 4. Choice C correctly reflects this electron distribution, making it the correct answer. Summary: A: Incorrect because it does not follow the electron configuration rule for aluminum. B: Incorrect as it does not distribute electrons according to the electron capacity of each shell in an aluminum atom. D: Incorrect because it does not match the electron distribution based on the electron configuration rule for aluminum.

Correct Answer: C

Rationale: The correct answer is C: Hypothalamus. The hypothalamus is a major structure of the limbic system responsible for regulating various essential functions like emotions, behavior, and physiological processes. It plays a crucial role in the control of thirst, hunger, body temperature, and hormonal regulation. The brainstem (A) is involved in basic life functions like breathing and heart rate, but it is not a part of the limbic system. The spinal cord (B) primarily functions in transmitting sensory and motor signals but is not directly related to the limbic system. The cerebral cortex (D) is responsible for higher-order thinking, sensory processing, and motor functions but is not a major structure of the limbic system.

Correct Answer: B

Rationale: The correct answer is B: Ribcage. The ribcage is a bony structure that surrounds and protects the lungs. It consists of ribs, sternum, and thoracic vertebrae, forming a protective cage around the vital organs in the thoracic cavity. The ribs provide a barrier against external forces and help maintain the shape and integrity of the lungs. The other choices are incorrect because the femur is a bone in the leg, the scapula is a bone in the shoulder, and the skull protects the brain, not the lungs.