Practice Science TEAS Test

Correct Answer: B

Rationale: The correct answer is B: Small intestine. The small intestine is primarily responsible for absorbing nutrients due to its large surface area and presence of specialized structures like villi and microvilli. These structures increase absorption efficiency. The stomach mainly breaks down food, the esophagus is a passage for food, and the large intestine primarily absorbs water and salts. Thus, the small intestine is the main site for nutrient absorption in the digestive system.

Correct Answer: B

Rationale: The correct answer is B: To contract and expand the lungs. The diaphragm is a dome-shaped muscle that plays a crucial role in respiration by contracting and relaxing to create changes in lung volume, allowing air to flow in and out of the lungs. When the diaphragm contracts, it flattens, increasing the space in the chest cavity and causing inhalation. When it relaxes, it returns to its dome shape, decreasing the space in the chest cavity and causing exhalation. Incorrect choices: A: To regulate air pressure in the lungs - While the diaphragm indirectly affects air pressure by creating changes in lung volume, its primary role is in creating the necessary space for inhalation and exhalation. C: To store oxygen - The diaphragm is a muscle and does not store oxygen. Oxygen is primarily stored in the blood and tissues. D: To break down carbon dioxide - The diaphragm is not involved in breaking down carbon dioxide. Carbon dioxide is

Correct Answer: B

Rationale: The correct answer is B: Gene. A gene is a smaller unit of genetic information than a chromosome. Chromosomes contain many genes, so they are larger in scale. The genome (option A) refers to the complete set of an organism's genetic material, which includes all the chromosomes. DNA (option C) is the genetic material that makes up chromosomes and genes. Option D is incorrect because while all the listed choices are related to genetics, genes are specifically smaller than chromosomes.

Correct Answer: A

Rationale: The correct answer is A: Cerebrum. The cerebrum is responsible for controlling voluntary muscle movements as it houses the motor cortex, which is involved in planning, executing, and coordinating voluntary movements. It receives and processes sensory information and sends out motor commands. The cerebellum (B) mainly coordinates balance, posture, and fine motor movements, not voluntary muscle movements. The medulla oblongata (C) controls vital functions like breathing and heart rate, not voluntary muscle control. The thalamus (D) acts as a relay station for sensory information but is not directly involved in controlling voluntary muscle movements.

Correct Answer: B

Rationale: The correct answer is B: Liver. The liver is responsible for producing bile, which helps in the digestion and absorption of fats. It is stored in the gallbladder (not produced by it), which releases it into the small intestine when needed. The pancreas produces digestive enzymes and insulin, not bile. The stomach produces gastric juices, not bile. In summary, the liver is the primary organ responsible for bile production, making it the correct choice.