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.
Introduction. 1  As either a tenant or a landlord, there are all sorts of details to keep track of when you're renting property. 2  Lease Agreement Form, Rental Agreement, Rental Contract. 3  A Lease Agreement is a useful tool whether you're a tenant or a landlord or you're leasing a residential property.