We have discovered how the digestive system , heart and lungs work together to provide the energy needed for muscle movement . What else do you need, to be able to move and respond to the environment around you?
All the organs and systems in a healthy human body work together to carry out functions essential to life. We need: Co-ordination ______ ______ To pick up information from our surroundings. ______ ______ _______ To process information received. Muscles, glands _________________ _________________ Notes
Structure of the Eye Cornea Pupil Iris Lens Retina Fovea Optic nerve Blind spot Vitreous humour
Judging the _____ of sound is more accurate using two ears rather than one.
The ear collects _____ waves which are directed down the auditory canal to the ___ ____.
This begins to _____ and the hammer, anvil and stirrup begin to move, transmitting sound waves towards the ___ ______ .
The fluid in the _____ now starts moving, stimulating the sound ________ cells which send an impulse along the _______ ____ to the brain .
Activity In pairs (you need a safety catcher!!): 1. Stand on one leg and count till you lose balance. How many seconds did you manage? 2. Stand on one leg again but this time with your eyes closed. Your friend can make sure you don’t fall over. How many seconds did you last this time? Why do you think this happened?
Draw yourself a simple diagram like the heads to the left.
Briefly describe how the semi-circular canals work to keep us balanced.
The Nervous System Brain, spinal cord and nerve fibres communicating with sense organs, muscles, glands and internal organs
Copy and complete the diagram above. Notes The Flow of Information CNS C____ N____ S______ Includes: Sense organs have r____ : e.g. Effectors Bring about response e.g nerves nerves Help Success Guide p70
Nerve Cells (neurones) Sensory neurons Carry information from sense organs to CNS. Use the cut out sheet and the following slides to make your own diagrams and notes. Receptor Sensory fibre Axon fibre Cell body with nucleus Impulses to CNS Notes
Relay neurons Connect neurones. Receive information from sensory neurones and transmit to motor neurones. Impulses from sensory neurone Impulses to other neurones Cell body with nucleus Main relay fibre
Motor neurons Carry information from CNS to muscles and glands. Effector: Muscle or gland Cell body with nucleus Axon fibre Impulses from CNS
Neurones and the Reflex Arc Sensory neurone cell body Sensory Fibre Motor Fibre Response Nerve ending in receptor e.g in muscle CNS Synapse Motor neurone cell body Relay neurone cell body Stimulus Nerve ending in receptor e.g in skin
Reflex Arc Label your copy of the reflex arc. CNS Notes Help Torrance p169
The Reflex Action Motor neurone Spinal Cord Sensory neurone Motor neurone Relay neurone
Reflex action animation Using an example of your choice e.g heat, standing on a tac etc., describe how impulses are picked up and sent around the reflex arc. Should include: -order neurones passed through -receptor and effector -how the reflex action protects the body Notes Help Torrance p169 Success Guide p71