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.
The major difference between a lease is that a rental contract may not obligate the tenant or the landlord for a fixed amount of time, for example and not more than, : one yea â¦ r, while a lease, when mutually signed, is legal and binding for the amount of time on the lease and must be renewed for continued tenancy.