For Autorhythmic cells For contractile cells ___Unlike or Similar to_____ the ot

Question

For Autorhythmic cells

For contractile cells

___Unlike or Similar to_____ the other type of cardiac muscle cell, these cells are unable to initiate their own action potentials.

They also make up the __________ of the cells found in your heart. Majority/Minority

Letter Event A L-type Ca^2+ channels ________ Either open or close B L-type Ca^2+ channels _________ open or close C Slow closure of _________ channels. (K^+, Na^+, and Ca^2+) D Funny channels open E ________ channels open. (Funny, T-type Ca^2+, and L-type Ca^2+) Autorhythmic cells Contractile cells +40 +30 +20 +10 +40 +30 +20 +10 2 -10 E-20 6 -30 -10 0 ?-20 Threshold potential 3 E -60 -70 -80 -90 -40 -50 E -60 -70 -80 -90 Threshold potential 4 Time (ms) Time (ms)

Explanation / Answer

For autorhythmic cells

A....L type calciun channel open

B...L type calciun channel close

C....slow closure of Na channel

D..funny channel.open

E..T type calcium channel

For contractile cell

0...rapid influx of Na channel

1... Na permiability rapidly decreases

2..platue phase primarily maintained by activation of slow lLtype Ca channel

3..inactivation of Ca channel and delayed activation of voltage gated K channel

4...At the resting potential,some k channel close while other k channel open

Contractile cells unlike or similar to autorhythmic cells ,the other type of cardiac muscle cell,these cells are unable to initiate their own action potential

They also make up the majority of the cells found in your heart

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