Asked by Samantha Boulden on May 17, 2024
Verified
Small molecules, such as water and many ions, cross the membrane without assistance from the cell. This movement is called ________ and requires NO energy expenditure by the cell.
A) passive transport
B) facilitated diffusion
C) active transport
D) none of the above
Passive Transport
The movement of substances across a cell membrane without the need for energy input, down their concentration gradient.
Facilitated Diffusion
A transport mechanism for molecules across the cell membrane via protein channels, without energy expenditure.
Energy Expenditure
The total amount of energy used by the body per day, encompassing basal metabolic rate, physical activity, and the energy used in digesting and metabolizing food.
- Learn the mechanisms of transport across cell membranes, including passive and active transport.
- Distinguish between different types of membrane transport processes.
Verified Answer
Learning Objectives
- Learn the mechanisms of transport across cell membranes, including passive and active transport.
- Distinguish between different types of membrane transport processes.
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