ATI TEAS Science

Correct Answer: C

Rationale: The somatic nervous system is responsible for voluntary movement of skeletal muscles. It controls conscious movements like walking, writing, or speaking. This system does not regulate automatic functions like breathing (option A), cognitive processes like thought (option B), or emotional responses like fear (option D). Therefore, the correct answer is C - Movement.

Correct Answer: B

Rationale: To find the molarity, we first need to calculate the moles of NaCl. Moles = mass / molar mass = 4.0g / (23.0g/mol + 35.5g/mol) = 0.056 moles. Next, we convert the volume to liters (120mL = 0.120L). Finally, molarity = moles / volume = 0.056 moles / 0.120L = 0.57 M (Choice B). Incorrect choices: A: 0.34 M - Incorrect calculation of moles or volume. C: 0.034 M - Incorrect calculation of moles or volume. D: 0.057 M - Incorrect conversion of volume to liters.

Correct Answer: C

Rationale: The correct answer is C (3). In a typical sensory pathway, there are three neurons involved: the primary sensory neuron, secondary sensory neuron, and tertiary sensory neuron. The primary sensory neuron transmits signals from the sensory receptor to the spinal cord or brainstem. The secondary sensory neuron carries the signal from the spinal cord or brainstem to the thalamus in the brain. Lastly, the tertiary sensory neuron carries the signal from the thalamus to the sensory cortex for processing. Therefore, a sensory pathway typically comprises three neurons to relay sensory information from the periphery to the brain. Choice A (1) is incorrect because sensory pathways involve multiple neurons for signal transmission. Choice B (2) is incorrect as it does not account for the tertiary sensory neuron involved in the pathway. Choice D (4) is incorrect because the typical sensory pathway consists of three neurons, not four.

Correct Answer: D

Rationale: Certainly! The correct answer is D because synergists assist primary movers (A), stabilize the point of origin while providing extra pull near the insertion (B), and help prevent unwanted movement at a joint (C). Synergists work together with the primary mover to facilitate smooth and efficient movement. Option A explains how synergists assist the primary movers in completing specific movements by adding force. Option B highlights the role of synergists in stabilizing the origin and providing additional force near the insertion point. Option C emphasizes that synergists help to stabilize the joint, preventing unnecessary movements and ensuring proper execution of the desired motion. Therefore, all the options (A, B, and C) collectively describe the functions of synergists, making option D the correct choice.

Correct Answer: A

Rationale: Platelets are responsible for clotting by forming a plug at the site of injury. They release chemicals to initiate clotting cascades. Red blood cells transport oxygen, antigens are markers on cells, and plasma cells are involved in immune response, not clotting. Therefore, the correct answer is A.