Practice Science TEAS Test

Correct Answer: B

Rationale: The correct answer is B: Retina. The retina is a layer of light-sensitive cells located at the back of the eye that detects light and converts it into signals for the brain through the optic nerve. The iris (A) controls the amount of light entering the eye, the lens (C) helps to focus light onto the retina, and the pupil (D) regulates the amount of light entering the eye, but they do not convert light into signals for the brain like the retina does.

Correct Answer: B

Rationale: The correct answer is B: Elbow joint. A hinge joint allows movement in one direction, similar to a door hinge. The elbow joint only allows flexion and extension, making it a classic example of a hinge joint. The hip joint (A) and shoulder joint (C) are examples of ball-and-socket joints, allowing a wider range of motion in multiple directions. The knee joint (D) is a modified hinge joint, allowing flexion and extension as well as slight rotation, but it is not a typical hinge joint due to its additional movements.

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: B

Rationale: The correct answer is B: Pineal gland. The pineal gland secretes the hormone melatonin, which plays a crucial role in regulating the body's circadian rhythm. Melatonin helps control the sleep-wake cycle, making it responsible for maintaining the body's internal clock. The other choices are incorrect because the thyroid gland regulates metabolism (A), the pancreas regulates blood sugar levels (C), and the hypothalamus controls various bodily functions but is not directly responsible for maintaining the circadian rhythm (D).

Correct Answer: C

Rationale: The correct answer is C: Near to the midline of the body. "Medial" refers to being close to the midline of the body or a structure. This term is commonly used in anatomy to describe the position of a body part relative to the midline. Choice A is incorrect as "being face down" is described as prone. Choice B is incorrect as "on the front of the body or limb" is described as anterior. Choice D is incorrect as "above or on top of the lungs" is described as superior. In summary, the term medial specifically refers to proximity to the midline of the body, distinguishing it from the other choices provided.