QAChemistry › Which transport systems utilize a chemical reaction for the energy source?
Q

Which transport systems utilize a chemical reaction for the energy source?

a. the glucose-Na+ transporter of intestinal epithelial cells

b. the glucose transporter of erythrocytes

c. the Ca2+ ATPase of the sarcoplasmic reticulum

d. the amino acid-Na+ transporter of kidney cells

e. the Na+/K+ ATPase of plasma membranes

A

Answer: c. the Ca2+ ATPase of the sarcoplasmic reticulum

The kind of transport system required to transport Ca2+ throughout the body is the active transport system. The Ca2+ ATPase found in the sarcoplasmic reticulum makes use of ATP as a direct energy source, hence it is classified as a form of active transport.

The glucose-Na+ transporter of intestinal epithelial cells makes use of a concentration gradient that must be created by a different transporter. The system of transport is known as the secondary active transport system. Only the primary active transport system can use ATP as energy.

1 year ago
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