TEAS 7 Science Practice Test

Correct Answer: C

Rationale: The correct answer is C: hypodermis. The hypodermis is the deepest layer of the skin and acts as an energy reserve by storing adipocytes (fat cells) that can be used for energy when needed. Adipocytes in the hypodermis help to insulate the body and provide cushioning. The epidermis (A) is the outermost layer of the skin that provides protection. The dermis (B) is the middle layer that contains blood vessels, nerves, and hair follicles. The stratum basale (D) is the bottom layer of the epidermis where new skin cells are produced. Therefore, the hypodermis is the correct answer as it specifically functions as an energy reserve through storing adipocytes.

Correct Answer: B

Rationale: The correct answer is B: make observations. This is the initial step of the scientific method because it involves gathering information about a phenomenon or problem. Observations help in identifying patterns, trends, and potential areas for investigation. Forming a hypothesis (A) comes after making observations, as it is a proposed explanation based on those observations. Analyzing data (C) and forming a question (D) also follow after making observations. Making observations is crucial as it sets the foundation for the rest of the scientific method process.

Correct Answer: A

Rationale: The correct answer is A: arteries. Arteries are blood vessels that carry oxygen-rich blood away from the heart to the rest of the body. They have thick, muscular walls to withstand the high pressure of blood pumped by the heart. Capillaries are tiny blood vessels where exchange of nutrients and waste occurs. Venules are small veins that collect blood from capillaries. Veins transport blood back to the heart and are characterized by thin walls and valves to prevent backflow.

Correct Answer: D

Rationale: The correct answer is D: conducting and respiratory. The conducting zone consists of structures that conduct air to the respiratory zone where gas exchange occurs. The respiratory zone includes the alveoli where oxygen is absorbed and carbon dioxide is released. Choices A, B, and C do not accurately represent the major zones of the respiratory system. The left and right bronchi are part of the conducting zone, not major zones. The nose and mouth are entry points but not major zones. The larynx and pharynx are part of the upper respiratory tract, not major zones.

Correct Answer: B

Rationale: The correct answer is B: sinoatrial node. The sinoatrial node is a cluster of specialized cells in the right atrium responsible for initiating the electrical impulses that regulate the heartbeat. It acts as the heart's natural pacemaker by setting the pace for the heart's contractions. The other choices are incorrect because: A: Sinus venosus is an embryonic structure in the heart, not the natural pacemaker. C: Atrioventricular node is responsible for conducting the electrical signal from the atria to the ventricles, not for generating the initial signal. D: Tricuspid valve is a heart valve that prevents backflow of blood from the right ventricle to the right atrium, not involved in generating electrical signals.