Question

A ___ receptor, is a cholinergic receptor which when bound by neurotransmitter is an ion channel that allows, sodium ion and potassium ion to pass through but allows more sodium ion influx thus causing the cell to ____

1) Adrenergic; hyperpolarize

2) Nicotinic; hyperpolarize

3) Nicotinic; depolarize

4) Adrenergic; depolarize

Answer 1

Answer

A nicotinic receptor, is a cholinergic receptor which when bound by neurotransmitter is an ion channel that allows, sodium ion and potassium ion to pass through but allows more sodium ion influx thus causing the cell to depolarize.

• Nicotinic receptor binds to neurotransmiter acetylcholine at the neuromuscular junction.
• It opens sodium channels embeded in the sarcolemma.
• Sodium ion influx into the skeletal muscle fiber increases positive charge inside the cell.
• This leads to depoalrization of the muscle fiber.

Option 3) Nicotinic; depolarize