Nervous And Hormonal Systems Flashcards
How do nerves control responses?
Receptors detect stimuli, receptors are usually in the sense organs and they are groups of cells that detect external stimuli. Eg: rod, cone cells detect stimulus in the eyes
Effectors then bring out a response to the stimuli. They include muscle cells found in glands ed: the pancreas. Muscle cells contract while glands secrete hormones
Receptors communicate with the effectors via the nervous system , the hormonal system or sometimes both
How does the central nervous system coordinate information?
The nervous system is made up of all the neurones in your body, the three main types being sensory, relay and motor. When receptors in a sense organ detect stimulus they send electrical impulses along the sensory neurone to the CNS. The CNS then sends electrical impulses to an effector along a motor neurone. The effector then responds
How quick are nerve responses?
Very quick as neurones transport information at high speeds using high speed electrical impulses
What are hormones?
Chemical messages sent in the blood
where are hormones carried ? And to where?
In the blood plasma to other parts of the body and only to particular cells
What do hormones control?
Things in organs that are and cells that are in need of constant adjustment
where are hormones produced?
In glands
How fast do hormones travel?
Quite slowly and tend to have relatively long lasting effects
What are the differences between hormone action and nerve action?
Hormones are slow messages - nerves are fast messages
Hormones act for a long time - nerves act for a shorter time
Hormones act in a general area - nerves act in a precise area
What does the CNS consist of?
Spinal cord and the brain
What are some examples of sense organs?
Eyes, ears, nose, tongue and skin
What is sent along the nerves?
Electrical impulses in and out of the CNS
