TEAS Practice Test Science

Correct Answer: B

Rationale: The correct answer is B: Red blood cells. Red blood cells contain hemoglobin, a protein that binds to oxygen in the lungs and carries it to tissues throughout the body. This process is essential for oxygen transport and delivery to cells for energy production. White blood cells (A), platelets (C), and plasma (D) do not have the specific function of transporting oxygen in the blood. White blood cells are involved in the immune response, platelets help in blood clotting, and plasma is the liquid component of blood that carries nutrients and waste products.

Correct Answer: D

Rationale: When blood sugar drops, the body needs to increase glucose levels. The correct answer, D, is that the pancreas releases glucagon. Glucagon signals the liver to break down stored glycogen into glucose, raising blood sugar levels. This is a crucial mechanism to maintain blood glucose homeostasis. Other choices (A, B, C) are incorrect as they do not address the specific response needed to increase blood sugar levels when it drops.

Correct Answer: B

Rationale: The correct answer is B: To secrete digestive enzymes. The pancreas secretes enzymes such as amylase, lipase, and protease that aid in breaking down carbohydrates, fats, and proteins in the small intestine. This process is crucial for proper digestion and absorption of nutrients. Choice A is incorrect because the pancreas does not secrete bile, which is produced by the liver. Choice C is incorrect because the absorption of nutrients primarily occurs in the small intestine, not the pancreas. Choice D is incorrect as waste transportation is mainly handled by the intestines and kidneys, not the pancreas.

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: B

Rationale: The correct answer is B: Parathyroid hormone. PTH is produced by the parathyroid glands and plays a crucial role in regulating calcium levels in the blood. It increases calcium levels by stimulating the release of calcium from bones, enhancing calcium absorption in the intestines, and reducing calcium excretion in the kidneys. Insulin (A) regulates blood sugar levels, not calcium. Thyroid hormone (C) controls metabolism, not calcium levels. Glucagon (D) increases blood sugar levels, not calcium.