Practice Science TEAS Test

Correct Answer: B

Rationale: The correct answer is B: Semicircular canals. These structures are filled with fluid and lined with tiny hair cells that detect movement and changes in head position, helping maintain balance. The other choices are incorrect because: A: Cochlea is responsible for hearing, not balance. C: Eardrum helps transmit sound vibrations, but not related to balance. D: Auditory nerve carries signals from the ear to the brain for hearing, not balance.

Correct Answer: B

Rationale: The correct answer is B: Serotonin. Serotonin is associated with feelings of happiness and well-being because it helps regulate mood, emotions, and sleep. Low levels of serotonin have been linked to depression and anxiety. Dopamine (A) is associated with pleasure and reward, GABA (C) is an inhibitory neurotransmitter that helps reduce anxiety, and Acetylcholine (D) is involved in muscle movement and memory. Serotonin is the most relevant neurotransmitter for happiness and well-being due to its specific role in regulating mood and emotions.

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: Cartilage. Cartilage is the type of tissue that protects the respiratory system's trachea. Cartilage provides structural support and flexibility to the trachea, allowing it to maintain its shape and prevent collapse during breathing. Bone (A) is too rigid for this function. Collagen (C) is a protein that provides strength but does not have the same supportive properties as cartilage. Keratin (D) is a protein found in skin, hair, and nails, not in the trachea. Therefore, cartilage is the most suitable tissue to protect the trachea in the respiratory system.

Correct Answer: A

Rationale: Estrogen is the correct answer because it is the hormone released by the ovaries to mature an egg. Estrogen plays a crucial role in the development of the ovarian follicle, promoting the growth and maturation of the egg. Luteinizing Hormone and Progesterone are also involved in the menstrual cycle but do not directly mature the egg. Testosterone is primarily produced in the testes and plays a role in male reproductive functions, not in egg maturation.