Co-Ordination And Response Flashcards
What is a hormone?
Chemical messengers. They are made in the endocrine glands. Travels in blood.
What other system of co-ordination is there in the human body?
Nervous system
Thyroid gland
Thyroxin
Pituitary gland
ADH LH, growth hormones
Pancreas
Insulin
Adrenal gland
Adrenaline, aldosterone
Ovary
Oestrogen, progesterone
Testis
Testosterone
Why do we need neurones and hormones?
Responding to changes in the environment
What makes up our endocrine system?
Hormones, glands
What makes up our nervous system?
Brain, spinal cord, sense organs, neurones, nerves, effectors
Stimuli/stimulus
Changed In the environment detected by receptors
Receptor
Detect stimuli grouped by sense organs
Sensory neurone
Carrys impulses from your sense organs to ur CNS
Motor neurones
Carry information from the CNS to the rest of the body
Effector
Muscles or glands. Your muscles respond to messages from the motor neurones.
Reflexes
Automatic responses, travel to spinal cord and avoid brain.
Journey of reaction
Receptor, sensory neurone, co-ordinator (CNS), motor neurone, effector
Pupil
Let’s light through into the eye
Lens
focuses image
Sclera
Hard, protective layer around the outside of the eye.
Iris
Ring of coloured tissue in the eye, controls the amount of light entering the eye.
Choroid
Contains blood vessels and pigment cells, at back of eye.
Retina
Contains specialised light- sensitive receptor cells. Converts image into electrical signals.