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Unit 2
Unit 2:homeostasis and Body systems
Question | Answer |
---|---|
Homeostasis | The process by which an organism's internal environment is kept in equilibrium, or stable, in spite of changes in the external environment. |
Stimulus | A thing or event that causes a response. |
External stimulus | A change in the environment outside of the organism. |
Internal stimulus | A change within the organism. |
System | Interacting, interrelated, or interdependent elements forming a more complex whole. |
Stable | balanced; unchanging. |
Physical change | Change which alters matter without changing its chemical composition or the identity of the substance. |
Chemical change | The formation of a new substance with different properties; cannot be undone by physical means. |
Skeletal system | Provides structure and protection for the body. |
Muscular system | Provides movement of the body. |
Respiratory system | exchanges oxygen and carbon dioxide. |
Reproductive system | Produces offspring. |
Nervous system | Controls and coordinates the body |
Integumentary system | Provides protection of the body. Includes the skin, hair and nails. |
Excretory system | Removes waste from the body. |
Endocrine system | Regulates the body with hormones secreted from glands. |
Digestive system | breaks down food to provide nutrients and energy. |
Circulatory system | Transports nutrients and oxygen to the body. |
Mechanical digestion | Physical breakdown of food. grinding and chewing. |
Chemical digestion | Breaking chemical bonds and rearranging atoms in molecules. When food is broken down using enzymes and gastric juices. |