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.
A property rental agreement is an agreement signed by the tenant and the landlord providing property use on a month-to-month basis. A tenant is the person or corporation using the space, either for residence or business, and the landlord is the person or corporation who owns the space.