Regulatory Systems
Regulatory systems in living organisms are responsible for maintaining a stable internal environment, despite changes in the external environment. These systems monitor various physiological parameters and make adjustments to keep these parameters within a narrow range, a process known as homeostasis.
Nervous System
The nervous system is a major regulatory system in the body. It consists of the brain, spinal cord, and nerves. The nervous system detects changes in the environment and sends rapid electrical signals to coordinate the body's response. For example, when you touch a hot stove, your nervous system quickly signals your muscles to pull your hand away to prevent injury.
Endocrine System
The endocrine system consists of glands that produce and secrete hormones, which are chemical messengers that regulate various bodily functions. Hormones are released into the bloodstream and can affect target organs and tissues throughout the body. For instance, the hormone insulin helps regulate blood sugar levels by promoting the uptake of glucose by cells.
Respiratory System
The respiratory system plays a role in regulating the body's pH balance by controlling the levels of carbon dioxide in the blood. When carbon dioxide levels rise, receptors in the body send signals to increase the rate and depth of breathing, allowing more carbon dioxide to be exhaled and helping to restore the pH balance.
Study Guide
- What is the main function of regulatory systems in living organisms?
- Describe the role of the nervous system in maintaining homeostasis.
- How do hormones produced by the endocrine system contribute to regulation within the body?
- Explain the role of the respiratory system in maintaining pH balance.
- Give an example of how the body's regulatory systems respond to a change in the external environment.
◂Science Worksheets and Study Guides Third Grade. Animals and their needs
Worksheet/Answer key
Worksheet/Answer key
Worksheet/Answer key
Vocabulary/Answer key