<span>Facilitated Diffusion-
Does not use energy. Membranes in the cell membrane pick up molecules & carry them across the membrane from high to low concentration</span>
Answer:
D. to increase their surface area
Explanation:
The usefulness of microvilli to cells that have them is TO INCREASE THEIR SURFACE AREA.
<span>I think you have repeated the same question
The intrinsic conduction system determines the basic rhythm of the beating heart. It consists of autorhythmic cardiac cells that initiate and distribute impulses (action potentials) throughout the heart which causes the heart to contract and expand which causes the beating or pumping of heart</span>
