Homoeostasis Flashcards
What is our normal body temperature
37°C
What are the two temperatures that result in death
26°C and 42°C
What is hyperglycaemia
Too much glucose in blood.
What is hypoglycaemia
Two little glucose in blood
What happens when you eat a bar of chocolate
1) chocolate is digested
2) glucose is absorbed into bloodstream
3) levels of glucose in blood are high
4) pancreas detects high levels of blood glucose
5) pancreas secretes insulin into blood
6) insulin is carried into the bloodstream
7) insulant binds to receptors on the liver and muscle cells
8) liver and muscle cells take up glucose
9) glucose is converted into glycogen for storage
10) blood glucose levels drop
What happens when you run to school
1) rate of respiration increases - glucose is taken out of bloodstream
2) levels of glucose in the blood a low
3) thank Chris the text no levels of blood glucose and secretes glucagon into blood
4) Glucagon is carried in the blood stream
5) glucagon binds to receptors on liver and muscle cells
6) glucagon is converted into glucose
7) muscle cells use glucose for respiration or release it into the bloodstream. Liver cells release glucose
8) blood glucose levels rise
What is diabetes
Deficient insulin production causing dangerously high blood sugar levels
- symptoms are frequent urination and dehydration
What does not happen in type 1 diabetes
Pancreas does not secrete insulin into the blood
What does not happen during Type II diabetes
The incident does not bind to receptors on never all muscle files so they have to control diet and exercise
What is thermo regulation
The ability of the body to keep its temperature close to 37°C
Important so that all chemical reactions taking place in cells can do so at a steady rate. At high temperatures enzymes get destroyed
What happens to your hair skin etc when it’s too hot
1) hair lies flat so more heat is lost by radiation
2) arterioles in skin widen (vasodilation) they allow more blood to flow through capillaries in skins surface. so more heat is lost by radiation
3) sweat glands open. The sweat evaporates and this cools you down
4) changes in behaviour e.g. Undressing, moving into shade
What happens to your hair skin etc when it’s too cold
1) the hair erector muscles contract pulling their hair up. This traps which is a poor conductor of heat and so less heat is lost
2) arterioles in the skins surface narrow (Vasco constriction) less blood flows into capillaries on the skins surface, so heat is lost by radiation
3) sweat glands clothes and less sweat is produced
4) shivering
5) General increase in metabolic rate
6) changes in behaviour e.g. dressing, moving into sun and activity
What is homeostasis
The maintenance of a stable internal environment in the body despite changes in the external environment
