Question

drag each item on the left to its matching item on the right. note that every item may not have a match, while some items may have more than one match.
active transport
na+
facilitated diffusion
amino acid k+
simple diffusion
co2
passive transport
ca+
amino acid co2 k+ na+ ca+

Explanation:

• Amino acids are transported by facilitated diffusion as they are polar and need transport proteins.
• $CO_2$ is small and non - polar, so it moves by simple diffusion.
• $K^+$ moves by facilitated diffusion through ion channels or transporters.
• $Na^+$ is actively transported against its concentration gradient by the sodium - potassium pump.
• $Ca^{+}$ can move by passive transport mechanisms such as through ion channels down its electrochemical gradient.

Answer:

• amino acid: facilitated diffusion
• $CO_2$: simple diffusion
• $K^+$: facilitated diffusion
• $Na^+$: active transport
• $Ca^{+}$: passive transport