How epinephrine/norepinephrine work on cardiac mysoties themselves
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| STEP 1 | Binding of epinephrine/norepinephrine changes shape of beta receptor -> activates G-Protein
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| STEP 2 | G-Protein subunit activates adenylate cyclase
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| STEP 3 | Adenylate cyclase catalyzes conversion of ATP to cAMP
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| STEP 4 | cAMP activates protein kinase A
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| STEP 5 | Protein kinase phosphorylates Calcium channels, influx on calcium in cell, stimulates contraction
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| STEP 6 | protein kinase also phosphorylates calcium channels on sarcoplasmic reticulum. calcium then moves into the cytoplasm and stimulates contraction.
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| STEP 7 | Protein kinase phosphorylates myosin, stimulates contraction
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| STEP 8 | Protein kinase phosphorylates sarcoplasmic Calcium ATPase -> speeds removal of calcium from cytoplasm during relaxtion. decreases over relaxtion time.
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