Practice Science TEAS Test

Correct Answer: B

Rationale: The correct answer is B: Pineal gland. The pineal gland secretes the hormone melatonin, which plays a crucial role in regulating the body's circadian rhythm. Melatonin helps control the sleep-wake cycle, making it responsible for maintaining the body's internal clock. The other choices are incorrect because the thyroid gland regulates metabolism (A), the pancreas regulates blood sugar levels (C), and the hypothalamus controls various bodily functions but is not directly responsible for maintaining the circadian rhythm (D).

Correct Answer: B

Rationale: The correct order of the layers of the epidermis from most superficial to deepest is: S. corneum, S. lucidum, S. granulosum, S. spinosum, S. basale (Choice B). This is because the outermost layer is the stratum corneum, followed by the stratum lucidum, then the stratum granulosum, stratum spinosum, and finally the stratum basale which is the deepest layer where new skin cells are produced. Choices A, C, and D do not follow this correct progression and therefore are incorrect.

Correct Answer: D

Rationale: The correct answer is D: Ventral. The frontal cavities are located in the anterior part of the body, which is synonymous with the ventral cavity. The ventral cavity contains multiple smaller cavities, including the thoracic and abdominopelvic cavities. The dorsal cavity is located at the back of the body and does not contain the frontal cavities. Therefore, the correct answer is the ventral cavity as it encompasses all of the frontal cavities within the body.

Correct Answer: C

Rationale: The correct answer is C: Near to the midline of the body. "Medial" refers to being close to the midline of the body or a structure. This term is commonly used in anatomy to describe the position of a body part relative to the midline. Choice A is incorrect as "being face down" is described as prone. Choice B is incorrect as "on the front of the body or limb" is described as anterior. Choice D is incorrect as "above or on top of the lungs" is described as superior. In summary, the term medial specifically refers to proximity to the midline of the body, distinguishing it from the other choices provided.

Correct Answer: D

Rationale: The independent variable is the factor that the researcher manipulates or controls. In this experiment, the independent variable is the dog food type as it is being purposely changed to observe its effect on the dependent variable. Time is not manipulated, dog weight and species are not changed intentionally, making them unsuitable as independent variables. The correct answer is D because it is the variable that is being tested and controlled in the experiment.