Reflexes Flashcards
1
Q
How do you test the stretch reflex?
A
Tapping the tendons
2
Q
What does tapping the tendons activate?
A
Alpha motor neurons
3
Q
Which muscle contracts, antagonist or agonist?
A
Agonist
4
Q
What is the stretch reflex the only known example of?
A
Monosynaptic reflex
5
Q
During the stretch reflex, what must the antagonist muscle do?
A
- Since they work in pairs
- Must relax
6
Q
Why do the antagonists relax?
A
Spindle afferents activate inhibitory interneurones which then decrease alpha motor neurone transmission to the target
7
Q
What reflex is mediated by golgi tendon organs?
A
Clasp-knife reflex
8
Q
Describe clasp knife
A
- Muscle contracts
- Pulls on GTO
- Stretch sensitive ion channels open increasing neurone charge
- Activates inhibitory interneurons that decrease muscle contractile strength
- Excitatory interneurons to the antagonist muscle are also activated
9
Q
What is the function of the clasp knife reflex?
A
- Protective
- Prevents the tendon being torn
10
Q
What receptors does the flexor withdrawal reflex use in the skin, muscle and joints?
A
Nociceptors
