1. Indicate whether it is the neuromuscular junction at rest or active (in the p
ID: 3513184 • Letter: 1
Question
1. Indicate whether it is the neuromuscular junction at rest or active (in the process of transmitting a signal); neuromuscular junction at rest & neuromuscular junction active
- Na+ diffusion
- Calcium channels open
- More negative charges inside sarcolemma
- Calcium channels closed
- Chemically-gated channels open
- ACh in synaptic cleft
- No Na+ diffusion
- Less negative charges inside sarcolemma
- ACh in synaptic vesicles
- Chemically-gated channels closed
2. Match term to the appropriate definition.
Terms:
- Acetylcholine
- Synaptic vesicle
- Acetylcholinesterase
- Sodium channel
- Acetylcholine receptor
- Calcium channel
- Synaptic cleft
Definitions:
- Neurotransmitter that stimulates skeletal muscle contraction.
- Membranous sac located in the axon terminal that contains neurotransmitter.
- Enzyme located in the synaptic cleft that breaks down acetylcholine.
- A type of voltage-gated ion channel located on the axon terminal.
- The space between the axon terminal and junctional folds.
- A type of voltage-gated ion channel located on the sarcolemma of the muscle fiber.
- A type of chemically-gated ion channel located on the junctional folds of the muscle fiber.
Explanation / Answer
Answer 1
Na+ diffusion - active
Calcium channel open- active
More Negative charges inside sarcolemma- inactive
Calcium channel closed - inactive
Ach in synaptic cleft -active
No Na+ diffusion - inactive
Less negative charges inside sarcolemma- active
Ach in synaptic vesicle - inactive
Chemically gated channels closed - inactive
Answer 2
Acetylcholine- a neurotransmitter that stimulates skeletal muscle contraction.
Synaptic vesicle- membranous sac located in axon terminal that contains neurotransmitter
Acetylcholinesterase - enzyme that breaks acetyl choline in synaptic cleft
Sodium channels- type of voltage gated channel located on axon terminal
Ach receptor- a type of chemically gated ion channel located on the junctional folds of the muscle fibre.
Calcium channel- a type of voltage gated channel located on sarcolemma of the muscle fibre
Synaptic cleft- space between the axon terminal and junctional folds
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