B1.7 The Nervous System Flashcards
1
Q
What is stimuli?
A
Responding to changes in the environment
2
Q
What is the CNS?
A
Central nervous system
The brain and the spinal cord
3
Q
What is the peripheral nervous system?
A
Nerves taking info from sense organs into the CNS, and from the CNS to effectors
4
Q
What are receptor cells
A
Special dpcells adapted to detect stimuli
5
Q
Name things within animal cells
A
Nucleus
Cytoplasm
Cell membrane
6
Q
Name a few sense organs + info
A
Skin- pressure, temp, touch, pai Tongue- chemicals in food (taste) Nose - chemicals in air (smell) Eyes- light (sight) Ears- sound, balance
7
Q
How do info pass from receptors?
A
As electrical impulses,
Travels along NERVE CELLS called NEURONES to brain,
Brain coordinates response
8
Q
Explain reflex action
A
Stimulus, receptor, sensory neurone, relay neurone, motor neurone, effector, response
S R SN RN MN E R
9
Q
What are effectors?
A
Glands/muscles that carry out a response
- muscle responds by contracting
- a gland responds by secreting chemical substance
