calcium pump. the mechanism of active transport of calcium (Ca 2+) across a membrane, as of the sarcoplasmic reticulum of muscle cells, against a concentration gradient; the mechanism is driven by hydrolysis of ATP.
A rental agreement differs from a lease agreement in that it is not a long-term contract and usually occurs on a month-to-month basis. This month-to-month lease agreement expires and then renews each month upon agreement of the parties involved.
Definition: The Domestic Lease and International Lease are the types of leases classified on the basis of the places where the parties to the lease agreement reside. The lease is the agreement between the lessor and the lessee; wherein the lessor grants permission to the lessee to use his property in return for periodical rental payments.