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For each of these 3 channels, describe where they are found, how they work, and the...

For each of these 3 channels, describe where they are found, how they work, and the role they play in physiology: 1) the cardiac ryanodine channel, 2) the voltage gated calcium channel on neurons, and 3) the dihydropyridine ryanodine channel.

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Answer #1
Type of Channel: Cardiac Ryanodine Dihydropyridine Ryanodine Voltage Gated Ca+2 in neuron

-Also known as cardiac Ca+2 release channel.

-It is an intracellular Ca+2 channel.

-A voltage dependent channel.

-It is also a Ca+2 channel.

-Voltage dependent Ca+2 channel.
Found in Cardiac(heart) muscle cell's membrane T-tubules of Skeletal muscle Neuron
Working A small amount of Ca+2 in cytosol near channel will cause it to release Ca+2 from sarcoplasmic reticulum. Work at depolarised membrane potential or due to action potentail Open at depolarized membrane potential.
Physiological Role Cardiac contraction Skeleton muscle contraction Excitation of Neuron,which help in release of hormones and neurotransmitter.

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