The skin is sensitive to what?
light
pressure
chemicals in the air
pain
touch
sound
tempreture
The central nervous system consists of which body parts?
The brain
The Pelvis
The neck
The spinal chord
The diaphram
Relay neurons...
carry signals from the CNS to effectors.
carry signals from receptors to the spinal cord and brain.
carry messages from one part of the CNS to another.
In a simple reflex action:
stimulus → receptor → relay neurone→ sensory neurone → motor neurone → effector
stimulus → receptor → sensory neurone → relay neurone → motor neurone → effector
stimulus → sensory neurone → motor neurone → relay neurone → receptor → effector
stimulus → receptor → motor neurone → relay neurone → sensory neurone → effector
Which of these are examples of effectors?
A muscle contracting
Blood clotting
A gland releasing a hormone
The heart pumping