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.
Rod and cone cells
Light sensitive cells. Todd work in dim light and cones work in bright light.
Optic nerve
Contiene sensory neurones to pass information to the brain
Cornea
Clear layer at front of eye, allows light in.
Learn sensory neurone and motor neurone diagrams
In book
Réflex arc digafsnr learn
In book
Neurotransmitters
Send info across synapse
what controls reflex actions
The spinal cord
What coordination system is the eye a part of?
The nervous system
What type of organ is the eye?
A sense organ
What part of the eye helps to focus an image
The lens
What is the name given to plant responses?
Trompisms
Positive tropisms
Grows towards stimulus
Negative tropism
Grows away from stimulus
What stimuli do plants Respond to?
Light
Water
Gravity
Where are auxins produced
At the tip of the shoot
What are auxins used for
They encourage cell elongation in shoots
What is homeostasis?
The maintenance of a constant internal environment in the body (such as constant temp, water balance, etc)