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 Difference Between Lease and Rent: Housing. The difference between lease and rent is that a lease generally lasts for 12 months while a rental agreement generally lasts for 30 days. Letâs say you move to a new city and youâre still on the ârentâ side of the rent vs. buy decision. Youâll want to rent a house or an apartment.