Question

For a muscle cell with 0.5 mm alanine outside the cell in the blood and 1 mm alanine inside the cell, net transport of alanine from the inside of the cell out into the blood would occur by group of answer choices

O facilitated diffusion using a transporter active transport.
O a gated channel.
O simple diffusion.
O none of these

Answer 1

Net transport of alanine from a higher concentration inside the cell to a lower concentration in the blood occurs through facilitated diffusion using a transporter, as this process allows transport down the concentration gradient without energy expenditure. Therefore, the correct option is A.

Step-by-step explanation:

For a muscle cell with 0.5 mm alanine outside the cell in the blood and 1 mm alanine inside the cell, net transport of alanine from the inside of the cell out into the blood would occur by facilitated diffusion using a transporter. Since facilitated diffusion is the process of transport molecules along their concentration gradient (from higher to lower concentration) without the need for cellular energy, it is the most suited mechanism in this scenario. Alanine, being a polar amino acid, requires a transporter to help it move across the hydrophobic lipid bilayer of the cell membrane.