the ca2+ -activated atpase of myosin b which is related to the contractile behaviour of muscle and the ca2+ -atpase of the sarcoplasmic reticulum which is related to the ability of this structure to accumulate calcium were activated in a range of calcium concentration producing an inhibition of ( na2+ + k+ ) -atpase .
C0001476
ca2
C0001473
atpase