TEAS Practice Test Science

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: 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: Artificially acquired active immunity. Vaccines stimulate the body's immune system to produce antibodies and memory cells, providing long-lasting protection against specific diseases. This type of immunity is acquired through deliberate exposure to antigens in vaccines, making it artificial and active. A: Naturally acquired passive immunity is when antibodies are passed from mother to baby, providing temporary protection but not long-lasting immunity like vaccines. B: Artificially acquired passive immunity involves receiving pre-made antibodies, providing immediate but short-lived protection, not the prolonged immunity provided by vaccines. C: Naturally acquired active immunity is developed through natural exposure to pathogens, which is different from the intentional exposure to antigens in vaccines.

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: Pluripotent stem cells. Pluripotent stem cells can differentiate into many different cell types but cannot form a complete organism. They have the ability to give rise to cells of all three germ layers. Totipotent stem cells (A) can form a complete organism, including both embryonic and extra-embryonic tissues. Multipotent stem cells (B) can develop into a limited range of cell types. Hematopoietic stem cells (D) specifically give rise to blood cells and their progenitors, so they are more specialized compared to pluripotent stem cells.