Describe Phase 0

Describe Phase 1

Describe Phase 2

Describe Phase 3

Describe Phase 4

During Phase 0, there is rapid _________ and _________

During Phase 0, voltage-gated NA+ channels _________

During Phase 1, there is _________ of voltage gated Na+ channels.

During Phase 1, voltage-gated _________ begin to open

During Phase 2, Ca2+ influx through voltage-gated Ca2+ channels balances _________

During phase 2, _________ influx triggers Ca2+ release from sarcoplasmic reticulum and myocyte contraction.

During phase 2, Ca2+
influx triggers Ca2+ release from
_________ _________ and
_________ _________

During phase 3, massive _________ due to opening of voltage-gated slow K+
channels and closure of voltage-gated Ca2+ channels.

During phase 3, massive K+ efflux due to opening of voltage-gated slow K+
channels and closure of _________

During phase 4, high K+ permeability through _________

Cardiac muscle action potential has a plateau which is due to what?

Cardiac muscle contraction requires what to induce Ca2+ release from sarcoplasmic reticulum (Ca2+-induced Ca2+ release)?

Cardiac muscle contraction requires Ca2+ influx from ECF to induce what?

Cardiac myocytes are electrically coupled to each other by what?

What are electrically coupled to each other by gap junctions?