Sensory Receptors 1 Flashcards
1
Q
How are cutaneous receptors protected?
A
Surrounded by a capsule
2
Q
How does the stimulus activate an action potential in these?
A
- Causes membrane deformation
- Triggers an action potential due to opening of stretch sensitive ion channels
3
Q
What is frequency coding?
A
- The bigger the stimulus, the greater the receptor potential
4
Q
With regards to the action potential what does frequency coding result in?
A
- Higher frequency of action potentials so a stronger stimulus
5
Q
What do muscle spindles do?
A
Monitor muscle length
6
Q
What fibres is skeletal muscle made up of?
A
- Intrafusal
- Extrafusal
7
Q
What is the structure of extrafusal fibres?
A
- Regular muscle fibres
8
Q
What are the three parts of muscle spindles?
A
- Intrafusal muscle fibre
- Specialised sensory neuron
- Specialised motor neuron
9
Q
What do the end of muscle spindles have?
A
Sarcomeres for contraction
10
Q
What controls the contraction of muscle spindles?
A
Gamma motor neurons
11
Q
What is muscle stretch and how does it monitor muscle length?
A
- As the muscle lengthens, stretch sensitive ion channels open
- This causes a depolarisation so the length is monitored
