B1- Staying In Balance Flashcards
What is homeostasis
The maintenance of a constant internal environment.
Making sure that cells can function efficiently
Give there examples of how the body balances inputs and outputs to keep internal environment steady
Steady temperature
Steady water
Steady carbon dioxide levels in the blood
What temperature do enzymes work best in the body and how is this temperature maintained
37 degrees.
Respiration maintains body temperature
What happens if body temperature becomes too high
Blood vessels widen and the blood flows closer to the skin so the heat can be transferred to the environment. Often through sweat which uses heat energy to be removed from the skin when it evaporates.
Why is getting too hot dangerous
If the body sweats to much you become dehydrated. This can lead to heat stroke and even death.
What happened if body temperature falls too low
Blood vessels constrict and blood flow near the skin is reduced. You stop sweating and the muscles start contraction (shivering). Shivering requires energy from respiration heat is released as a by product.
Why can being too cold be dangerous
When the body drops below 35 degrees you get hypothermia. This causes unconsciousness and sometimes death.
Where can body temperature readings be taken from
Most, ear, skin surface, finger or anus.
What is vasodilation
When the blood vessels widen in order to increase heat loss by radiation
What is vasodilation
When the blood vessels narrow in order to reduce heat loss by radiation
How is body temperature regulated
The brain monitors body temperature using the nervous system and the hormonal system then temperature control systems keep a constant temperature
What are hormones
Chemical messages released by glands directly into the bloodstream. They travel around the body to their target organs
Which travel faster through blood, hormones or nerve impulses
Nerve impulses travel much quicker
Where is insulin released from and what does it do
Released By the pancreas to control blood sugar levels
What causes type 1 diabetes
The pancreas failing to produce insulin
