TEAS Practice Test Science

Correct Answer: B

Rationale: The correct answer is B: Skeletal muscle. Skeletal muscles are attached to bones and responsible for moving the skeleton through voluntary contractions. They are under conscious control, making them voluntary muscles. Cardiac muscle (A) is found in the heart and responsible for pumping blood. Smooth muscle (C) is found in organs and blood vessels, responsible for involuntary movements. Voluntary muscle (D) is a general term that can refer to both skeletal and smooth muscles, but in this context, it does not specifically address moving the skeleton.

Correct Answer: B

Rationale: The correct answer is B: To transport oxygen and nutrients. The circulatory system, composed of the heart, blood vessels, and blood, primarily functions to deliver oxygen and nutrients to the body's cells and remove waste products. The heart pumps oxygen-rich blood to tissues and organs, ensuring they receive the necessary nutrients for energy production. In contrast, choices A, C, and D are incorrect. Regulating body temperature is primarily the role of the body's thermoregulatory system, fighting infection is the function of the immune system, and breaking down waste is the responsibility of the digestive system.

Correct Answer: B

Rationale: The correct answer is B: Dendrite. Dendrites are the part of the neuron that receives signals from other neurons, allowing for communication between neurons. They contain receptors that bind to neurotransmitters released by neighboring neurons. The axon (A) is responsible for transmitting signals away from the cell body. The synapse (C) is the junction between two neurons where neurotransmitters are released. The myelin sheath (D) is a protective covering that insulates the axon and speeds up signal transmission but does not receive signals from other neurons.

Correct Answer: B

Rationale: The correct answer is B: Fight infection. White blood cells are a crucial part of the immune system, responsible for identifying and attacking foreign invaders such as bacteria, viruses, and other pathogens. They play a key role in defending the body against infections and diseases. Choices A, C, and D are incorrect because white blood cells do not primarily function in transporting oxygen, producing antibodies, or regulating body temperature. Oxygen transport is mainly the role of red blood cells, antibody production is the function of B cells, and body temperature regulation involves processes such as sweating and shivering controlled by the hypothalamus.

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.