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: A

Rationale: The correct answer is A: calcium. Bone is primarily composed of calcium phosphate, which provides strength and rigidity to the bone structure. Calcium is crucial for bone formation and mineralization. Magnesium and potassium are important for various bodily functions but are not the primary components of bone. Collagen is a protein that provides flexibility and support but is not an inorganic material found in bones.

Correct Answer: A

Rationale: The correct answer is A: epiglottis. The epiglottis is the cartilaginous flap that protects the larynx during swallowing by covering the glottis, preventing food or water from entering the trachea. This allows air to flow into the respiratory system while diverting food and liquids to the esophagus. B: Bronchioles are small air passages in the lungs and do not play a role in protecting the larynx during swallowing. C: Epithelium is a tissue that lines various organs, including the respiratory tract, but it does not specifically protect the larynx. D: The tongue is a muscular organ in the mouth that aids in chewing and swallowing but does not serve as a cartilaginous flap to protect the larynx.

Correct Answer: C

Rationale: The correct answer is C: At the center of the brain hemispheres. The pineal gland is located in the brain, specifically at the center of the brain hemispheres. It is a small endocrine gland responsible for secreting melatonin, a hormone that regulates sleep-wake cycles. Choices A, B, and D are incorrect because the pineal gland is not located below the larynx, above the kidney, or at the base of the brain. The pineal gland's location in the center of the brain makes it unique and vital for regulating various physiological functions.

Correct Answer: D

Rationale: The correct answer is D: high polarity. Water molecules are polar, with a slightly positive end (hydrogen) and a slightly negative end (oxygen). This polarity allows water to form hydrogen bonds with other polar molecules, like ionic salt compounds, facilitating their dissolution. Adhesion (A) is the ability of water to stick to other substances, cohesion (B) is the ability of water molecules to stick to each other, and high specific heat (C) is the ability of water to resist temperature changes. These properties are not directly related to water's ability to dissolve ionic salt compounds.