ATI TEAS 7 Science

Correct Answer: B

Rationale: Insulin is the correct answer as it is responsible for lowering blood sugar levels by promoting the uptake of glucose into cells. Glucagon raises blood sugar levels, adrenaline and cortisol are stress hormones that increase blood sugar levels. Therefore, the correct choice is B.

Correct Answer: C

Rationale: The correct answer is C: To regulate body functions through hormones. The endocrine system consists of glands that produce hormones to regulate various bodily functions like metabolism, growth, and reproduction. This system helps maintain homeostasis by communicating through chemical messengers. Choices A, B, and D are incorrect as fighting infection is primarily the role of the immune system, oxygen transportation is done by the respiratory system, and food breakdown is the function of the digestive system.

Correct Answer: B

Rationale: The correct answer is B: One layer. Simple epithelium consists of a single layer of cells. This arrangement allows for efficient diffusion and absorption due to the short distance between cells and the underlying tissues. Option A is incorrect because epithelial tissue always has at least one layer. Option C is incorrect as it describes stratified epithelium, which has two or more layers. Option D is incorrect as it refers to stratified squamous epithelium, not simple epithelium.

Correct Answer: D

Rationale: The correct answer is D: Solar energy to electrical energy. Solar cells, also known as photovoltaic cells, convert sunlight (solar energy) directly into electricity through the photovoltaic effect. When sunlight hits the solar cell, photons from the sunlight are absorbed by the semiconducting material in the cell, creating an electric current. This process allows solar cells to generate electricity without moving parts or the need for any other energy sources. Explanation for other choices: A: Electrical energy to light energy - This is incorrect as solar cells do not convert electrical energy into light energy, but rather convert solar energy into electrical energy. B: Chemical energy to electrical energy - This is incorrect as solar cells do not involve any chemical reactions to produce electricity. C: Solar energy to thermal energy - This is incorrect as solar cells are designed to convert solar energy directly into electrical energy, not thermal energy.

Correct Answer: A

Rationale: The correct answer is A: Hypothalamus. The hypothalamus plays a vital role in regulating body temperature by responding to internal and external temperature changes. It coordinates the body's response to maintain a stable temperature through processes like sweating or shivering. B: Cerebellum is responsible for coordinating movement and balance, not body temperature regulation. C: Pituitary gland regulates hormone production but not directly involved in body temperature regulation. D: Thyroid gland controls metabolism and energy levels but not primarily responsible for regulating body temperature.