Practice Science TEAS Test

Correct Answer: B

Rationale: The correct answer is B: Circulatory system. The circulatory system consists of the heart, blood vessels, and blood, responsible for transporting oxygen, nutrients, hormones, and waste products throughout the body. The respiratory system (A) is responsible for gas exchange, the nervous system (C) transmits signals, and the digestive system (D) processes food. The circulatory system is specifically designed for the transportation of blood, making it the correct choice.

Correct Answer: A

Rationale: The correct answer is A: Spinal cord. The spinal cord is part of the central nervous system because it is located within the vertebral column and connects the brain to the rest of the body. It serves as a pathway for transmitting sensory and motor signals between the brain and the peripheral nervous system. Peripheral nerves (B) are not part of the central nervous system as they extend from the spinal cord and brain to the rest of the body. The brainstem (C) is also part of the central nervous system, but the question asks for a specific part, not a general one. The cerebellum (D) is located in the brain and is responsible for motor coordination, but it is not part of the central nervous system.

Correct Answer: B

Rationale: The correct answer is B: Malaria. Malaria is caused by a protozoan parasite called Plasmodium, which is transmitted through the bite of infected mosquitoes. Protozoan parasites are single-celled organisms that can cause various infectious diseases in humans. Measles (A), mumps (C), and mononucleosis (D) are caused by viruses, not protozoan parasites. Viruses are different from protozoa in terms of structure, replication, and mode of infection. Therefore, the correct choice is B as it aligns with the characteristic of being caused by a protozoan parasite.

Correct Answer: D

Rationale: Step-by-step rationale: 1. A: The atrioventricular valves lie between the atria and the ventricles - This is true for both the tricuspid valve (right side) and the mitral valve (left side). 2. B: The pulmonary semilunar valve lies between the right ventricle and the pulmonary trunk - This is accurate, as the pulmonary semilunar valve separates the right ventricle from the pulmonary artery. 3. C: The atrioventricular valves prevent backflow into the atria when the ventricles contract - This is true as the AV valves close to prevent backflow during ventricular contraction. 4. Therefore, the correct answer is D, as all the statements are correct and accurately describe heart valve anatomy and function.

Correct Answer: D

Rationale: The independent variable is the factor that the researcher manipulates or controls. In this experiment, the independent variable is the dog food type as it is being purposely changed to observe its effect on the dependent variable. Time is not manipulated, dog weight and species are not changed intentionally, making them unsuitable as independent variables. The correct answer is D because it is the variable that is being tested and controlled in the experiment.