L-Type Calcium Channels, Such as Those Found in the Soma

question 2

Multiple Choice

L-type calcium channels, such as those found in the soma of leech Retzius neurons, are especially suitable for extrasynaptic signaling because they

• A) open only after a lag of up to one second.
• B) have a very high depolarization threshold for opening.
• C) are permeable to magnesium as well as calcium.
• D) inactivate rapidly after opening.
• E) are not easily inactivated.

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