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.
RESIDENTIAL LEASE AGREEMENT - 09/20/13. A lease agreement or a rental agreement is a vital legal document that should be completed prior to a landlord renting property to a tenant. While both agreements are similar in nature, they are not the same and it is important to understand the differences.