Which of the following represent(s) facilitated diffusion across a membrane? A. carriers, such as ionophores B. permeases, such as GLUT1, a glucose transporter found on erythrocytes C. transport through protein pores D. All of the listed choices represent facilitated diffusion.

A

Explanation:it is passive and it does not require directly chemical energy from ATP hydrolysis in the transport step itself, Rather molecules and ions move down their concentration gradient reflecting its diffusive nature.

D. All of the listed choices represent facilitated diffusion

Explanation:

Facilitated diffusion across a membrane is also called passive -mediated transport or facilitated transport. It involves the spontaneous passive movement of ions or molecules past a cell membrane through certain membrane protein. This process is brought about by channel or carrier proteins. It is used by ions that cannot easily cross the phospholipid bilayer

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.