Transcribed Image Text: 24 of 30 -Ranking Activity: A cardiac contractile cell action potential Part A 4. Rank from the first to the last steps to describe the correct order

Transcribed Image Text: 24 of 30
-Ranking Activity: A cardiac contractile cell action potential
Part A
4.
Rank from the first to the last steps to describe the correct order of events of a cardiac contractile cell action potential. Refer to the graph of a contractile cell action
potential as you rank the events.
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Nat
Voltage-gated
ECF
ECF
ECF
ECF
Ca+
channel
K+ channel
Nat channel
Kt channel-
K+
Cytosol
Cytosol
Cytosol
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Y Transcribed Image Text: V: Cardiovascular System: The Heart
24 of 30
Ing Activity: A cardiac contractile cell action potential
Reset
ECF
Na Voltage-gated
Nat channel
ECF
ECF
Ca+
channel-
ECF
K+ channel
K+
K+ channel-
Cytosol
Gytosol
Cytosol
Cytosol
Repolarization phase:
Nat and Cat channels close as K+
continue to exit, causing repolarization.
Rapid depolarization phase:
Voltage-gated Nat channels activate
and Nat enter, rapidly depolarizing
the membrane.
Initial repolarization phase:
Nat channels are inactivated and some
K+ channels open; K+ leak out, causing
a small initial repolarization.
Plateau phase:
Cat channels open and Ca+
enter as Kt exit, prolonging the
depolarization,
Last
First
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