B5 - Homeostasis and Respone Flashcards
What is homestasis
Homeostasis is the regulation of the internal conditions of a cell or organism to mantain optimum conditions for function, despite external changing conditions.
Why is it important to maintain a stable internal enviroment within the body.
It’s important to maintain a stable enviroment within the body So that our cells and enzymes can function optimally and not get damaged
Name 3 internal conditions that Homeostasis regulates
• Blood Glucose level
• Body temperature
• Water levels.
•Blood pH, ion levels
What is the difference between internal conditions and external conditions
Internal conditions refer to conditions inside the body such as body temperature.
External conditions refer to conditions outside the body, such as room temperature.
What is the role of a receptor
A receptor detects stimuli (a change in the internal or external enviroment)
What is the role of a coordination centre
A coordination centre interprets changes and organises a response
Where are the coordination centres located in the body
● Brain
● Spinal corrd
● Pancreas
What is the role of an effector
An effector brings about a response to restore optimum conditions
What are the 2 types of effectors and what do they do when stimulated
Muscles - contract
Glands - release hormones
What is the nervous system
The nervous system is a complex network of nerves that carry messages to and from the brain and spinal cord to and from various parts of the body, which allows us to detect and react to changes in the enviroment.
What is the endocrine system
The endocrine system is made up of glands that release hormones.
These hormones act as chemical messengers that allow communication throughout the body.
What is negative feedback
Negative feedback is when a change in a system causes an action that reverses the change
For example, a rise in temperature will cause a fall In temperature
