Responding To Change Flashcards
(28 cards)
What is homeostasis
Maintaining a stable internal environment
What is osmoregulation
Regulating water content
What is thermoregulation
Regulating body temperature
What part of the brain controls body temperature
Hypothalamus
What happens when you are too hot?
Erector muscles relax so hairs lie flat
Lots of sweat
Vasodilation
What happens when you are too cold?
Erector muscles contract so hairs stand up
Little sweat
Vasoconstriction
What are hormones
Hormones are chemical
What glands are hormones made in?
Endocrine
How long do hormones last far
A long time
What do neurones do
Transmit information around the body
What are dendrons
Branched endings that connect neurones
What is the axon protected by
Myelin sheath
What is a myelin sheath
Electrical insulator and speeds up implese
What is the connection between two neurones and what chemicals diffuse across
Synapse and neurotransmitter
What are the sense organs
Eyes ears nose tongue and skin
What is in the CNS
Brain and spinal cord
What is the reflex arc
Sensory neurone, relay neurone, motor neurone and effector
What happens when blood glucose level is too high
Insulin secreted by pancreas
Insulin makes liver turn glucose to glycogen
What happens when blood glucose level is too low
Glucagon secreted by pancreas
Glucagon makes liver turn glycogen to glucose
What is type to diabetes
Pancreas produces little or no insulin
How is type 1 diabetes controlled
Limit the intake of simple carbohydrates
Injecting insulin
What is type 2 diabetes
Person is resistant to insulin
How is a person classified as obese
BMI over 30
Body mass / height ^2
What is phototropism
Growth of a plant in response to light
Shoots are positive
