TEAS Practice Test Science

Correct Answer: B

Rationale: The correct answer is B: White blood cells. White blood cells are a crucial component of the immune system as they play a key role in defending the body against infections and diseases. They help identify and destroy pathogens, produce antibodies, and regulate the immune response. Red blood cells (A) are responsible for transporting oxygen, platelets (C) are involved in blood clotting, and plasma (D) is the liquid component of blood, but they are not directly involved in the immune response. Therefore, white blood cells are the correct choice for being a component of the immune system.

Correct Answer: B

Rationale: The correct answer is B: Larynx. The larynx houses the vocal cords, which vibrate to produce sound for voice production. The pharynx is involved in swallowing, the trachea is responsible for air passage to the lungs, and the bronchi are the airways that branch off from the trachea into the lungs. The larynx specifically contains the vocal cords, making it the structure responsible for voice production.

Correct Answer: D

Rationale: The correct answer is D because keratin is a structural protein found in hair, nails, and the outer layer of the skin. It provides strength and protection to these structures. Choice A is incorrect because keratin is not an enzyme but a protein. Choice B is incorrect as keratin is not involved in neuromuscular function. Choice C is incorrect as the hypodermis is primarily composed of adipose tissue, not keratin. Therefore, the correct answer is D based on its role and location in the body.

Correct Answer: B

Rationale: The correct answer is B: Skeletal muscle. Skeletal muscles are attached to bones and responsible for moving the skeleton through voluntary contractions. They are under conscious control, making them voluntary muscles. Cardiac muscle (A) is found in the heart and responsible for pumping blood. Smooth muscle (C) is found in organs and blood vessels, responsible for involuntary movements. Voluntary muscle (D) is a general term that can refer to both skeletal and smooth muscles, but in this context, it does not specifically address moving the skeleton.

Correct Answer: C

Rationale: The correct answer is C, interstitial space. Lymph flows through the interstitial space, which is the fluid-filled space between cells in tissues. Arteries and veins carry blood, not lymph. Lumen is the inside space of a tubular structure, such as a blood vessel, and does not specifically refer to where lymph flows. Therefore, the interstitial space is the most appropriate term for the space where lymph flows through the body.