B3.1 nervous system Flashcards
1
Q
recall what the nervous system consists of
A
2
Q
how are nerve cells adapted to their function
A
- A long (axon) so they can carry messages up and down the body.
- (dendrons) which branch further as dendrites at each end. These receive incoming impulses from other neurons.
- fatty (myelin) sheath acts as a electrical conductor to speed up the electrical impulse
3
Q
what does the cns consist of
A
brain and spinal cord
4
Q
describe what a reflex action is
A
- automatic actions done in order to protect yourself from danger
- are very quick as the brain is not involved in thinking
5
Q
describe what an effector is
A
- a muscle contracting
- a gland releasing a hormone into the blood
