TEAS Practice Test Science

Correct Answer: D

Rationale: When blood sugar drops, the body needs to increase glucose levels. The correct answer, D, is that the pancreas releases glucagon. Glucagon signals the liver to break down stored glycogen into glucose, raising blood sugar levels. This is a crucial mechanism to maintain blood glucose homeostasis. Other choices (A, B, C) are incorrect as they do not address the specific response needed to increase blood sugar levels when it drops.

Correct Answer: D

Rationale: The correct answer is D: Ventilation. Ventilation specifically refers to the mechanical act of breathing, which involves the movement of air in and out of the lungs. This process is essential for the exchange of oxygen and carbon dioxide in the body. A: Diffusion is the process of molecules moving from an area of high concentration to an area of low concentration. While diffusion plays a role in gas exchange during respiration, it is not the mechanical act of breathing itself. B: Perfusion refers to the process of blood flow through the tissues. Although perfusion is vital for delivering oxygen to the body's cells, it is not the mechanical act of breathing. C: Respiration encompasses the entire process of gas exchange in the body, including both ventilation and the exchange of gases at the cellular level. While respiration is closely related to breathing, it is not specifically the mechanical act of breathing.

Correct Answer: C

Rationale: The correct answer is C, interstitial space. Lymph flows through the interstitial space, which is the fluid-filled space between cells in tissues. Arteries and veins carry blood, not lymph. Lumen is the inside space of a tubular structure, such as a blood vessel, and does not specifically refer to where lymph flows. Therefore, the interstitial space is the most appropriate term for the space where lymph flows through the body.

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.

Correct Answer: C

Rationale: The correct answer is C: Mitochondria. Mitochondria are known as the powerhouse of the cell because they are responsible for producing ATP through cellular respiration. This process involves the breakdown of glucose to generate energy in the form of ATP. Ribosomes (A) are responsible for protein synthesis, the nucleus (B) houses the cell's genetic material, and the endoplasmic reticulum (D) is involved in protein synthesis and lipid metabolism, but not ATP production. Mitochondria's unique structure and enzymes make them the primary site for ATP production in the cell.