Homeostasis
Effector
Directs the appropriate response
How does the digestive system contributes in maintaining homeostasis?
It breaks down food and makes nutrients available to the cells in the body.
Why is positive feedback inherently unstable( compared with negative feedback)?
It moves the controlled variable further away from the steady state. Sometimes the variable is pushed way too far that it can become unhealthy and even fetal
How is positive feedback loop normally stopped?
Positive feedback loop normally is stopped when the physiological response has reached its peak, and has achieved its particular goal
Homeostasis
A mechanisms ability to maintain a stable, internal environment.
Describe the three main components of a regulatory control system in the human body
A receptor to detect change, a control centre, and an effector to direct a response
Describe a situation in which a positive feedback loop does not stop?
A situation when positive feedback might not stop is during a fever. The body temperature rises above the normal temperature and then reaches 109 degrees F and keeps rising. This can result in brain damage and fatal events.
Receptors
A structure that detects change and sends a signal to the brain
What is an example of a positive feedback loop?
During child labor there is an increase in the production of oxytocin hormone. The increase in oxytocin intensifies the contractions, which will proceed to the birth of the child.
Explain how negative feedback mechanisms maintain homeostasis in a variable environment
Negative feedback mechanism work to return controlled variables back towards the normal range.
example of negative feedback mechanisms maintains homeostasis
Negative feedback mechanisms maintain homeostasis by producing sweat when the body has generated excessive body heat.
Describe one mechanism by which responses to stimuli are brought and coordinated
The Hormonal Controls: glands responde to the messages from the brain to produce hormones.
Describe one mechanism by which responses to stimuli are brought and coordinated
The Nervous System: the brain sends out nerve impulses to the body, so that the body can carry out certain activities.
Describe another mechanism that operates to restore homeostasis after the infection by a pathogen
The Skin; for example when someone gets hurt and scraps their knee the skin cell inflames the injury site to fight off bacteria that might accumulate in the area.
Explain one way in which water and ion balance are maintained.
The digestive system: water and ions taken on through food and drinks, and then you lose water and ions through the feces
Describe one mechanism that operates to restore homeostasis after the infection by a pathogen
The immune system; it keeps infectious microorganisms out of the body and destroys those that enter the body.
Control Center
The part of the brain that receives, and interprets the message sent.
Explain another way in which the body regulates its respiratory gases during exercise.
Through breathing rate increase: when your exercise your heart rate increases, which means that your body is getting more oxygen. With an increase of oxygen, there is an increase of carbon dioxide that you're body is taking in. Your body gets rid of the necessary carbon dioxide through the breathing, and when there is a lot of it you're breathing increases.
Explain one way in which the body regulates its respiratory gases during exercise.
Through heart rate increase: heart rate increases because your body needs extra oxygen, during exercise our body needs more oxygen hence the increase in heart rate
Explain another way in which water and ion balance are maintained.
Through the kidneys: water and ions taken in with food and drinks, then you lose urea, water, and ions via urine.
Positive Feedback
acts to ENHANCE the original stimulus.
Negative Feedback
brings the mechanism back to a normal stable state
How does respiratory system contributes in maintaining homeostasis
takes in oxygen and removes carbon dioxide.
