Topic 5 - Homeostasis and Repsonse Flashcards
What is negative feedback?
When the level of something gets too high or low your body uses negative feedback to bring it back to normal
How does negative feedback respond to a level of something being too high-
-Receptors detect a stimulus level is too high
-The coordination centre receives and processes the information then organises a response
-Effector produces a response, which counteracts the change and restores the optimum level and the level decreases
How does negative feedback respond to a level of something being too low
-Receptor detects a stimulus as the level is too low
-The coordination centre receives and processes the information, then organises a response
-Effector produces a response which counteracts the change and restores the optimum level. the level increases
What happens if effectors keep producing responses
-This happens as long as they’re stimulated by the coordination centre, potentially causing the opposite problem by making the level change too much
-The receptor detects if the level become too different and negative feedback starts again
Why do the internal conditions of our body need to be regulated?
To maintain the right conditions for cells to function properly and for enzyme action and they require a constant temperature and pH as well as a constant supply of dissolved food and water.
What is the CNS
-The central nervous system is in vertebrates (animals with backbones) this consists of the brain and spinal cord only.
What are sensory neurones
-The neurones that carry information as electrical impulses from the receptors to the CNS
What are the motor neurones
The neurones that carry electrical impulses from the CNS to effectors
What are effectors
All your muscles and glands, which respond to nervous impulses and bring about a change
What are receptors
-The component of the control system that detects stimuli
What different types of receptors are there (2 examples
-Taste receptors on the tongue
-Sound receptors in the ears
What is homeostasis
the regulation of the internal conditions of a cell or organism to maintain optimum conditions for function in response to internal and external changes.
What does homeostasis control
-blood glucose concentration
-body temperature
-water levels
How is the CNS connected to the body
-In mammals the CNS is connected to the body by sensory neurones and motor neurones
How does information travel from the receptors to the CNS
Pass through neutrons as electrical impulses
