B10-14 Flashcards
Central Nervous System consist of
The brain and spinal cord
What are receptors
Receptors are cells that detect stimulus
What are sensory neurones
Electrical impulses that carry infor from the receptors to the CNS
What are motor neurones
Carry electrical impulses from the CNS to the effectors
Job of effectors
To respond to the electrical impulses and bring about change
What are effectors
Muscles and glands
Pituitary gland (master gland)
Produces hormones that regulate body conditions.
These hormones act on other glands
Thyroid gland
Produces thryoxine.
Involves regulating things like metabolism,heart and temperature
Adrenal gland
Produces adrenaline.Used to prepare for a fight or flight response
Pancreas
Produces insulin.Used to regulate the blood glucose levels.
Ovaries
Produces oestrogen.Involved in the menstrual cycle
Testes
Produce testosterone.
How is glucose removed from the blood
Cells
What ia homeostasis
Keeping conditions inside your body steady.
Why is homeostasis important.
Cells need to be in the right conditions to work properly
What ia the Control System
When the level of something is too high then it’s control system brings it back to normal
Receptors
Detect a stimulus
Coordination centre
Recieves and processes the infor.Then gathers a response
Effectors
Carries out the response.Returns the level to optimum level
Reflax actions occur
Automatically and rapid .They do not involve the conscious part of the brain
Variables in the reaction time practical that need to be kept the same for a fair test
Person should always use the same hand.
Ruler should be dropped from the same height
Type 1 diabetes is when
a pedson produces little or no insulin.
What happens when someone has Type 1 diabetes
Their blood glucose levels could rise to a dangerous level.
How is Type 1 diabetes treated
Inject insulin throughout the day
Type 2 diabetes is
When a person becomes resistant to there own insulin
People who get Type 2 daibetes are normally
Obese
Memstrual cycle stage 1
Bleeding starts.Uterus lining breaks down for about 4 days
Menstrual Cycle Stage 2
Uterus lining builds up again.From Day 4 to Day 14.
Menstrual Cycle Stage 3
An egg is deceloped and released from the ovaries at day 14.This is called ovulation
Menstrual Cycle Stage 4
The wall is then maintained from day 14 until day 28.If no fertilised egg has landed on the uterus wall by day 28.Cycle starts again
Variation
Same species have differences because of different alleles.
Competition
Some individuals are more adapted to the environment.
Survival
The more adapted organisms are more likely to survive.Therefore they are more likely to reproduce
Inheritance
Successful individaul pass on there genes to the next.Causing them to have their alelles.
How does bacteria become antibiotic resistant
Bacteria can mutate in their DNA.
If one bacteria becomes antibiotic resistant why is that a peoblem
Because they can pass the gene for antibiotic resistant onto their offspring.
Why is anti biotic bacteria a problem for humanity
No effective treatment for it.
How are fossils preserved
In ice,amber,tar pits
How are fossils
