Homeostasis and Control Systems Flashcards

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What is homeostasis?

Homeostasis is the process of keeping the internal conditions of the body steady.

Why does the body need to keep its internal conditions steady?

Cells and enzymes only work well in a narrow range of conditions. So the body must keep things like temperature and pH steady.

Give three examples of things in the body that are controlled by homeostasis.

Examples include body temperature, blood glucose concentration, and the water content of the body.

What are the three main parts of a control system in the body?

A receptor detects a change. A coordination centre processes the information. An effector carries out the response.

What is a stimulus in a control system?

A stimulus is a change in the environment that can be detected, such as a change in temperature or light.

What is the role of a receptor in a control system?

A receptor detects a stimulus and sends information to the coordination centre.

What is the role of a coordination centre in a control system?

The coordination centre, such as the brain or spinal cord, receives information and decides how the body should respond.

What is an effector in a homeostasis control system?

An effector is a muscle or gland that carries out the response to restore the body to its normal conditions.

What is meant by negative feedback in homeostasis?

Negative feedback is when a change from the normal level triggers a response that brings the level back towards normal.

How do nervous and hormonal control systems differ?

Nervous control uses electrical impulses along nerves and is very fast. Hormonal control uses chemicals in the blood and is usually slower but longer lasting.