homeostasis Flashcards
(20 cards)
What is homeostasis?
The process of maintaining a constant internal environment
What factors are kept constant in homeostasis?
- Temperature
- Water content
- Available energy
- Available oxygen
What type of feedback systems are involved in homeostasis?
- Negative feedback
- Positive feedback
What is negative feedback?
The response is in the opposite direction to the stimulus
Provide an example of negative feedback.
Level of glucose in blood
What is positive feedback?
Keeps the response going in the same direction
Provide an example of positive feedback.
A breastfeeding mother
What are the two systems that require coordination for homeostasis?
- Nervous system
- Endocrine system
What is thermoregulation?
The control of body temperature
Where is the body’s thermostat located?
In the hypothalamus
What do thermoreceptors do?
Detect the temperature of blood that flows through the hypothalamus
What is the role of insulin and glucagon?
Help maintain blood glucose levels.
What happens if there is too much glucose in the blood?
Thick, slow moving blood
What happens if there is too little glucose in the blood?
Dizziness and insufficient energy
What is metabolism?
The chemical reactions taking place inside the body to turn food into energy
What happens if body temperature is below 37°C?
Slowed down metabolism
What happens if body temperature is above 37°C?
Metabolism can stop and lead to death
What role do kidneys play in water regulation?
Control both salts and water balance within the body
What is the role of adrenal glands during stress?
Release adrenalin into the bloodstream
What are some effects of adrenaline on the body?
- Increased heart rate
- More alert
- Muscular actions and energy levels increase
