Which of the following body systems is involved in detecting and responding to environmental changes? A - HSC - SSCE Biology - Question 2 - 2010 - Paper 1

To answer this question, we need to analyze the options provided and identify which body system is responsible for detection and response to environmental changes.

1. Circulatory System: This system is primarily responsible for transporting blood, nutrients, and gases. It is not primarily involved in detecting environmental changes.
2. Digestive System: Focused on the breakdown and absorption of food; it does not play a role in detecting or responding to environmental stimuli.
3. Excretory System: Responsible for waste elimination but not directly involved in sensing environmental changes.
4. Nervous System: This system detects changes in the environment through sensory receptors and processes this information to initiate appropriate responses.