TEAS Practice Test Science

Correct Answer: C

Rationale: The correct answer is C: Skull. The axial skeleton consists of bones along the central axis of the body, including the skull. The skull protects the brain and is a key part of the axial skeleton. The other choices - A (Femur), B (Humerus), and D (Pelvis) are all part of the appendicular skeleton, which includes the bones of the limbs and girdles. The femur is the thigh bone, the humerus is the upper arm bone, and the pelvis is part of the hip bone, all of which are not considered part of the axial skeleton.

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: 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.

Correct Answer: B

Rationale: The correct answer is B: To control body movement and coordination. The nervous system is responsible for receiving sensory input, processing information, and sending signals to control muscle movement and coordination. It includes the brain, spinal cord, and nerves. Choice A is incorrect as the immune system fights infection. Choice C is incorrect as metabolism is regulated by the endocrine system. Choice D is incorrect as oxygen transportation is the function of the circulatory system, not the nervous system.

Correct Answer: C

Rationale: The correct answer is C: molarity. Molarity is a concentration unit that depends on pressure because it is defined as the number of moles of solute dissolved in one liter of solution. Pressure can affect the volume of the solution, thus impacting the molarity. A: ppm (parts per million) and B: ppb (parts per billion) are mass-based concentration units and do not directly depend on pressure. D is incorrect because while molarity does depend on pressure, ppm and ppb do not.