TEAS 7 Science Practice Test

Correct Answer: A

Rationale: The correct answer is A: left atrium. During pulmonary circulation, oxygenated blood returns from the lungs to the heart. This oxygenated blood enters the heart through the pulmonary veins and specifically flows into the left atrium. The left atrium then contracts to push this oxygen-rich blood into the left ventricle, which pumps it out to the rest of the body. Summary: - B: right atrium receives deoxygenated blood from the body, not the lungs. - C: left ventricle receives blood from the left atrium, not directly from the lungs. - D: right ventricle pumps deoxygenated blood to the lungs, not receive blood from the lungs.

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: C

Rationale: The correct answer is C: controlled experiment. In a controlled experiment, the researcher manipulates one or more independent variables to observe the effect on the dependent variable, while controlling for other variables. In this scenario, the researcher is controlling the conditions and variables to study the impact of the manipulated independent variable on the dependent variable. Incorrect choices: A: Field experiment involves conducting research in real-world settings, which may not necessarily involve manipulation of variables. B: Natural experiment involves observing naturally occurring events without any manipulation by the researcher. D: Observational study involves observing and recording data without any intervention or manipulation of variables.

Correct Answer: C

Rationale: The primary function of the large intestine is to absorb water and compact material into solid waste. This process helps in forming feces for elimination. Absorbing digested material into the blood (Choice A) is mainly done in the small intestine. Nutrient processing and metabolizing (Choice B) occur in various organs like the liver and kidneys, not primarily in the large intestine. Bile production and storage (Choice D) are functions of the liver and gallbladder, not the large intestine.

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.