The answer to number 12 is mate.
Answer
Facilitated diffusion is the diffusion
Explanation
Facilitated diffusion is the diffusion of solutes through transport proteins in the plasma membrane
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I think the answer is liver and hepatic portal vein
Hope this helps
Answer: Sphincter muscles
Explanation:
The circular rings of smooth muscles, that can contract to regulate the movement of the smooth muscles that can contract to regulate the movement of food through the gastrointestinal tract are known as sphincter muscles.
These two layers are outer layer and inner layer. The outer layer is longitudinal and the inner layer is circular. They contract rhythmically to squeeze food.
