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.
Contents: Lease vs Rent. Relationship Between Lease and Rent. In real estate, a lease is the contractual agreement that defines the terms of the use of a property. This includes what is being rented, for how long, and other stipulations that both parties agree to (e.g., whether pets are allowed on the property).