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 lease agreement is a contract between a landlord and a tenant that covers the renting of property for long periods of time, usually a period of 12 months or more. The lease agreement is very specific in detailing the responsibilities of both parties during the lease and it includes all the necessary information to ensure that both parties are protected.