2.10.5 Co-ordination Systems in Humans Flashcards
There are two different control systems in humans that work together to help us respond to stimuli. These are:
The nervous system
The hormonal system (also known as the endocrine system)
Changes in our external environment or in the internal environment of our bodies act as, what?
stimuli
The nervous and hormonal systems coordinate, what?
a suitable response to these stimuli
What does the nervous and hormonal system coordinate a suitable response to stimuli allow
This allows us to make sense of our surroundings, to respond to the changes that occur in our surroundings and coordinate and regulate body functions
Information is sent through the nervous system as, what?
electrical impulses
What are electrical impulses
electrical signals that pass along nerve cells known as neurones
These impulses travel along neurones at very high speeds, how fast?
up to 100 metres per second
What does the high speed impulse travel allow?
This allows rapid responses to stimuli (e.g. the withdrawal reflex that causes you to move your hand away extremely quickly when it touches a flame)
The nervous system coordinates the activities of, what?
sensory receptors decision-making centers in the central nervous system (CNS), and effectors such as muscles and glands
The nervous system is used to control functions that need instant, or very rapid, what?
responses
Information is sent through the endocrine (hormonal) system as, what?
chemical substances known as hormones
How are hormones carried around
Hormones are carried by the blood and can therefore circulate around the whole body
What do hormones do?
Hormones transmit information from one part of the organism to another and bring about a change (they provide a signal that triggers a response)
- They alter the activity of one or more specific target organs
Hormones are used to control functions that, what?
do not need instant responses
What are hormones produced by
endocrine glands
