Homeostasis Flashcards
What is Homeostasis?
The state of balance in the body
What are the 3 system changes in the body that needs to remain in balance?
- Temperature
- Water Levels
- Glucose Levels
What are the 8 organs involved in homeostasis?
- Hypothalamus
- Pituitary gland
- Lungs
- Liver
- Pancreas
- Kidney
- Muscles
- Skin
What is negative feedback?
Negative feedback ensures that, in any control system, changes are reversed and returned back to the set level.
What are Homoiotherms?
Organisums that can regulate there own body temperature - humans
What are Poikilotherms?
Organisums that cannot regulate there own temperature - Snakes
What is the name given to temperature conrol in the body?
Thermoregulation
What are the 3 steps used during thermoregulation?
- Receptors which are linked to the hypothalamus decet change
- Nerve receptors are sent to the skin
- Skin reacts to change the temperature
Should the body need to cool down what does it do?
- Sweats - transferring internal heat to external areas
- Vasodilation - Blood vessels widen, allowing more blood to cool down close to the skin.
If the body need to warm up, what does it do?
- Vasocontrict - Narrow blood vessles, taking blood away from the cool of the skin
- Piloerection - Hairs strand up trapping a layer of warm air close to the skin
- Muscles - Shivvering
Where is insulin & Glucogon stored?
Pancreas
If you have too much glucose in the blood stream, what does the body do?
The pancrease releases Insulin, which breaks down the glucose and stores it as Glycogen
If the body has too little glucose, what does the body do?
The pancrease releases Glucogon, which breaks down Glycogen into glucose.
What si wrong with Diabetics?
The do not produce enough Insulin
What is Osmoregulation?
Water control
What organ controls water regulation?
Hypothalamus
What other organs are involved, bar the hypothalamus, in the regulation of water?
- Pituitary gland
- Kidneys
What is the cycle of osmoregulation?
- Osmoreceptors in the hypothalamus send messages to the nerve ⇒
- Nerve impulses go to the pituitary gland ⇒
- The pituitary gland reduces or increases the amount of ADH (anti-Diuretic Homone) that gets released⇒
- This signals to the kidneys what way to react.
What is the kidneys function during water regulation?
The either reabsorb more or less water depending on requirements.
If more is reabsorbed, urine is stonger.
The kidneys are also a filter for the blood removing waste and impuraties.
