ATI TEAS Science Questions

ATI TEAS Science Questions Related

Review ATI TEAS Science Questions related questions and content

What is the function of valves in arteries?

  • A. To maintain high blood pressure for the proper diffusion of nutrients in capillaries.
  • B. To prevent backflow of blood due to high pressure away from the heart.
  • C. As a vestigial trait from evolution, like the appendix, that serves no purpose.
  • D. Valves are absent in arteries but present in veins.
Correct Answer: B

Rationale: Valves in arteries serve the crucial function of preventing backflow of blood. Arteries carry blood at high pressure away from the heart, and the valves ensure that blood flows in one direction, towards the capillaries, to maintain efficient circulation. Without these valves, there would be a risk of blood flowing backward, compromising the effectiveness of blood circulation in the body. Choices A, C, and D are incorrect. Choice A incorrectly suggests that valves maintain high blood pressure for nutrient diffusion in capillaries, which is not their function. Choice C inaccurately compares valves to vestigial traits, like the appendix, implying they serve no purpose, which is untrue. Choice D is incorrect as valves are indeed present in arteries to regulate blood flow, not just in veins.

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What term describes the front of the body, for example, the kneecap?

  • A. Posterior
  • B. Anterior
  • C. Superior
  • D. Inferior
Correct Answer: B

Rationale: The correct answer is 'B: Anterior.' In anatomy, 'anterior' refers to the front of the body, like the kneecap. On the other hand, 'posterior' describes the back of the body. Choices 'C: Superior' and 'D: Inferior' relate to structures being above or below a reference point, respectively, and are not used to describe the front or back of the body. Therefore, 'Anterior' is the most appropriate term given the context provided in the question.

Find the lowest coefficients that will balance the following combustion equation: __C H + __O2 → __CO2 + __H2O

  • A. 1:5:5:2
  • B. 4:10:20:8
  • C. 2:9:10:4
  • D. 2:5:10:4
Correct Answer: C

Rationale: To balance the combustion equation CxHy + O2 → xCO2 + y/2 H2O, we need to balance the carbon and hydrogen atoms. The balanced equation for the given combustion is: 2C H4 + 9O2 → 2CO2 + 4H2O. This means that the correct coefficients are 2:9:10:4, which corresponds to choice C. Choice A (1:5:5:2) does not balance the equation correctly, choice B (4:10:20:8) has excessive oxygen and does not balance the equation, and choice D (2:5:10:4) does not provide the correct ratio of oxygen to balance the equation.

What is an electrically charged atom called?

  • A. Ion
  • B. Isotope
  • C. Molecule
  • D. Compound
Correct Answer: A

Rationale: An ion is an atom that has gained or lost electrons, resulting in a positive or negative charge, making it electrically charged. This term specifically refers to atoms with a net electrical charge. Isotopes are atoms of the same element with different numbers of neutrons, not electrically charged. Molecules are formed when atoms bond together, but they are not necessarily charged. Compounds are substances composed of different elements bonded together, but they may not be electrically charged.

Which of the following is the best unit to measure the amount of blood in the human body?

  • A. Ounces
  • B. Liters
  • C. Milliliters
  • D. Pounds
Correct Answer: B

Rationale: Liters are the best unit to measure the amount of blood in the human body because blood volume is typically measured in liters in the medical field. Using liters provides a standardized and accurate measurement of the significant amount of blood in the human body, which is typically around 5-6 liters for an average-sized adult. Other units like ounces, milliliters, and pounds are not commonly used to measure blood volume in clinical settings. Ounces are too small a unit for measuring blood volume, milliliters are less commonly used in this context compared to liters, and pounds are a unit of weight rather than volume.

What cells compose the epidermis?

  • A. Keratinocytes
  • B. Epithelial cells
  • C. Fibroblasts
  • D. Melanocytes
Correct Answer: A

Rationale: The correct answer is A - Keratinocytes. The epidermis is primarily composed of keratinocytes, which are a type of epithelial cell. Keratinocytes synthesize the protein keratin, providing protection against physical damage and water loss. While epithelial cells are correct, specifying keratinocytes is more precise. Fibroblasts are not the main cell type in the epidermis; they are found in the dermis, where they produce collagen and other extracellular matrix components. Melanocytes are responsible for producing melanin pigment in the skin and are also present in the epidermis, but they are not the predominant cell type like keratinocytes.

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