ATI TEAS Practice Science Test

Correct Answer: C

Rationale: The correct order is C: Thrombocytes, erythrocytes, and leukocytes. Thrombocytes (platelets) are the smallest, followed by erythrocytes (red blood cells), then leukocytes (white blood cells). This order is based on the size of these blood cell types, with thrombocytes being the smallest and leukocytes being the largest. Thrombocytes play a crucial role in blood clotting, erythrocytes are responsible for oxygen transport, and leukocytes are essential for immune function. Incorrect choices: A: Incorrect order; leukocytes are the largest, not the smallest. B: Incorrect order; thrombocytes are the smallest, not the largest. D: Incorrect order; leukocytes are larger than erythrocytes, so the order is incorrect.

Correct Answer: B

Rationale: The correct answer is B because rugae increase the surface area of the stomach, allowing for better absorption of nutrients and more efficient digestion. This increased surface area facilitates the breakdown of food particles and enhances the absorption of nutrients into the bloodstream. The other choices are incorrect because rugae do not directly impact the output of gastric juices (A), permeability of stomach walls (C), or types of nutrients that can diffuse (D).

Correct Answer: B

Rationale: The correct answer is B: Liver. The liver plays a crucial role in storing and metabolizing vitamins, releasing them as needed when intake decreases. It helps maintain vitamin levels in the body. The other choices are incorrect because the appendix has no role in vitamin absorption or regulation, the pancreas primarily aids in digestion and hormone regulation, and the stomach's main function is to break down food, not regulate vitamin levels.

Correct Answer: A

Rationale: The dependent variable in a study is the outcome that is being measured or tested. In this scenario, the weight of the fish is being measured weekly as a result of being fed different amounts of food daily. The fish weight is directly influenced by the amount of food they consume, making it the dependent variable. This is the variable that changes in response to the independent variable, which is the amount of food given. Summary: A: Weight of the fish - Correct, as it is the outcome being measured. B: Type of food used - Incorrect, as this is not the variable being tested. C: Number of fish tanks - Incorrect, as this is not the variable being measured. D: Frequency of feedings - Incorrect, as this is not the outcome being tested.

Correct Answer: A

Rationale: The correct answer is A because the pharynx serves as a common passageway for both food and air. It allows food to pass from the mouth to the esophagus and air to pass from the nasal cavity to the larynx. It plays a crucial role in the process of swallowing and breathing. Choice B is incorrect because the warming and moistening of air during inhalation primarily occur in the nasal cavity and the respiratory tract, not the pharynx. Choice C is incorrect as the creation of a chest cavity at the base of the lungs is primarily the function of the diaphragm, not the pharynx. Choice D is incorrect as the structural support to the alveolar region is mainly provided by the alveoli themselves and surrounding tissues, not the pharynx.