TEAS Practice Test Science

Correct Answer: B

Rationale: The correct answer is B: Somatic. The somatic nervous system controls voluntary movements by sending signals from the brain to skeletal muscles. It is under conscious control. Autonomic (A), sympathetic (C), and parasympathetic (D) systems control involuntary functions like heart rate and digestion. These systems operate without conscious effort, making them unsuitable for controlling voluntary movements.

Correct Answer: C

Rationale: The independent variable is the one that is intentionally manipulated by the researcher. In this case, the botanist is studying root growth, so the variable that the botanist can control and manipulate is the light exposure. By changing the amount of light the roots receive, the botanist can observe how it affects root growth. Temperature (choice A) and root tissue (choice B) are not variables being manipulated in this experiment, so they are not the independent variable. Root length (choice D) is the dependent variable, as it is the outcome being measured based on the changes in the independent variable, light exposure.

Correct Answer: B

Rationale: The correct answer is B: Scapula. Flat bones are thin, flattened bones that provide protection and allow for muscle attachment. The scapula fits this description as it is a thin, flat bone located on the back of the shoulder. The other choices (A: Femur, C: Humerus, D: Tibia) are long bones that are not thin and flat like flat bones. The femur, humerus, and tibia are all weight-bearing bones with a different shape and function compared to flat bones.

Correct Answer: D

Rationale: Rationale: 1. Choice A is correct as the left ventricle pumps oxygen-rich blood into the aorta. 2. Choice B is correct as the right ventricle pumps deoxygenated blood into the pulmonary trunk. 3. Choice C is correct as ventricles are indeed the main pumping chambers of the heart. 4. Therefore, choice D, "All of the above," is correct as it encompasses all true statements about the ventricles. Other choices are incorrect as they do not cover all accurate statements.

Correct Answer: C

Rationale: The correct answer is C: Thymus. The thymus is responsible for maturing T cells, a type of white blood cell crucial for immune responses. The thymus is where immature T cells develop into functional T cells through a process called thymic education. The other choices are incorrect because the hypothalamus (A) is involved in regulating hormones, the pineal gland (B) regulates sleep-wake cycles, and the thyroid (D) produces hormones that regulate metabolism. These structures do not have a direct role in maturing T cells.