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.
Diffen âº Finance âº Personal Finance. In real estate, a lease is a contract for a specific period of time â often 6 or 12 months â after which the contract expires, while rent is the payment made under the terms of the lease. Real estate leases are also commonly known as rental agreements..