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Homeostasis
Year 9 Science
| Question | Answer |
|---|---|
| Homeostasis | Homeostasis is the process of keeping the body's internal conditions stable, even when the outside environment changes. |
| Eye receptor | Photoreceptors (detect light) |
| Ear receptor | Mechanoreceptors (detect sound vibrations) |
| Nose and Tongue receptor | Chemoreceptors ( chemicals in air and food) |
| Skin/ Touch receptor | Thermoreceptor and Pain receptor |
| The stimulus response model in order | stimulus - receptor - control centre - effector - response |
| 1. Stimulus | A change in the environment |
| 2. Receptor | Detects the change |
| 3. Coordinator / control centre | Processes information, e.g. the brain or spinal cord |
| 4. Effector | A muscle or gland carries out the response |
| 5. Response | The body's reaction |
| How do feedback loops maintain blood glucose and body temperature? | Negative feedback loops maintain homeostasis by reversing changes and returning the body to normal. Blood glucose: Insulin lowers glucose; glucagon raises it. Temperature: Sweating cools; shivering warms. |
| What are the 3 types of neurons ? | Sensory (senses information, interneuron (in between) and motor (makes muscles respond) |
| Sensory neurons | Take sensory information from the environment (ie. getting poked with a needle) and send signals to the brain |
| Motor neurons | Communicate information from the brain to tissues and organs throughout the body, allowing for movement |
| Interneuron | |
| Reflex action | a rapid, automatic response that usually happens without conscious thought. It helps protect the body. (ie. Pulling your hand away from a hot surface ) |
| Conscious response | a voluntary action that involves awareness and processing by the brain. (ie. seeing a ball coming towards you and choosing to catch it |
| Endocrine glands and the hormones they produce | The endocrine system is a group of glands that release hormones into the bloodstream. Hormones are chemical messengers that regulate body functions. |
| What are hormones? | a chemical messenger released by an endocrine gland into the bloodstream. |
| What is a target cell? | A cell that has the correct receptor for a particular hormone. |
| The fight-or-flight response | The fight-or-flight response is the body's automatic reaction to a threat or stressful situation. The adrenal glands release adrenaline, which prepares the body for action. |
Created by:
angel_123