GCSE Biology - Homeostasis #54

The video explains homeostasis as the process of maintaining a stable internal environment in the body. It describes how automatic control systems, consisting of receptors, coordination centers, and effectors, help regulate conditions like temperature and glucose levels. The nervous and endocrine systems play key roles in communication. The concept of negative feedback is introduced, illustrating how it helps return body conditions to normal when they deviate from optimal levels.

What is the primary purpose of homeostasis in the body?

• To change external conditions

• To decrease glucose levels

• To increase body temperature

• To maintain a stable internal environment

Which component of the automatic control system detects changes in the body?

• Receptors

• Effectors

• Hormones

• Coordination centers

What role do coordination centers play in the body's control systems?

• They release hormones into the bloodstream

• They carry out changes in the body

• They interpret changes and decide on responses

• They detect changes in the environment

How does the nervous system communicate within the body?

• By releasing chemicals into the bloodstream

• Via fast and precise electrical impulses

• By changing external conditions

• Through slow hormonal signals

What is a key characteristic of the endocrine system?

• It is slower and more generalized

• It is faster than the nervous system

• It only affects the brain

• It affects all cells in the body

What happens when the level of a substance in the body gets too high?

• Negative feedback decreases it to normal

• Negative feedback increases it further

• The body ignores the change

• The nervous system stops functioning

In the context of negative feedback, what occurs if a substance level becomes too low?

• The endocrine system stops working

• The body remains unchanged

• The level is decreased further

• The level is increased back to normal