Question 1

What are control systems in the context of Edexcel A Levels Biology B?

Accepted Answer

In Edexcel A Levels Biology B, control systems refer to the mechanisms that organisms use to maintain homeostasis and regulate internal conditions. These systems include feedback loops that involve receptors, effectors, and a control center to ensure stable internal environments, crucial for optimal functioning of biological processes.

Question 2

How do feedback mechanisms work in biological control systems?

Accepted Answer

Feedback mechanisms in biological control systems involve a series of steps where a change in a system triggers a response that influences the original change. Negative feedback reduces the effect of the change, helping to maintain homeostasis, while positive feedback amplifies the change. These mechanisms are essential for regulating processes like temperature and blood glucose levels.

Question 3

Can you explain the role of the nervous system in control systems?

Accepted Answer

The nervous system plays a critical role in control systems by rapidly transmitting signals between different parts of the body. It detects changes in the environment through sensory receptors and processes this information in the brain or spinal cord, which then sends signals to effectors to elicit an appropriate response, ensuring quick and precise regulation of bodily functions.

Question 4

What is the significance of hormonal control in biological systems?

Accepted Answer

Hormonal control is significant in biological systems as it involves the secretion of hormones by endocrine glands, which travel through the bloodstream to target organs. This type of control is generally slower than nervous control but is crucial for regulating long-term processes such as growth, metabolism, and reproduction, maintaining balance and coordination in the body.

Question 5

How do control systems contribute to homeostasis in organisms?

Accepted Answer

Control systems contribute to homeostasis by constantly monitoring and adjusting internal conditions to remain within a narrow range. This involves detecting deviations from set points and initiating corrective actions through feedback mechanisms. By doing so, control systems ensure that vital conditions such as temperature, pH, and ion concentrations are kept stable, which is essential for the survival and proper functioning of organisms.

Control systems

Quiz

Frequently Asked Questions