Question

unit 1 cumulative test (characteristics of life, biomolecules, cell structure and transport) 2025
41 of 42

when a person touches a hot surface, sensory receptors in the skin send signals through nerves to the spinal cord and brain. the spinal cord triggers a quick reflex to pull the hand away, while the brain processes the pain, triggers emotional responses, and stores the experience in memory. this coordination between sensory input, motor output, and emotional processing allows the body to respond quickly and learn from the experience.

based on the passage, which statement best explains the brain’s role in responding to stimuli?

○ the brain only controls emotional responses, while the spinal cord handles movement.
○ the brain processes sensory input, coordinates physical and emotional reactions, and contributes to learning.
○ the brain delays the response to allow time for decision-making.
○ the brain is not involved in reflex actions or memory formation.

Explanation:

1. Analyze Option 1: The passage says the brain processes pain, triggers emotional responses, and stores experience (learning), so it's not only for emotional responses. Eliminate this.
2. Analyze Option 2: The passage states the brain processes pain (sensory input), coordinates with motor output (physical reaction), emotional response, and stores experience (learning). This matches the passage.
3. Analyze Option 3: The spinal cord enables a quick reflex, and the brain's role here is to process and learn, not delay. The passage emphasizes quick response, so this is incorrect.
4. Analyze Option 4: The passage says the brain processes pain, triggers emotional response, and stores experience (memory), so it is involved. Eliminate this.

Answer:

The brain processes sensory input, coordinates physical and emotional reactions, and contributes to learning.