Movement in and out of cells Particles move in and out of cells by During diffusion, particles spread out from where they are in concentration to where they are in concentration. Diffusion in the body multicolumn(1)(|c|)( Direction of movement ) & multicolumn(1)(c|)( Substance ) Blood to cells & 1. Cells to blood & 2.

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Movement in and out of cells Particles move in and out of cells by During diffusion, particles spread out from where they are in concentration to where they are in concentration. Diffusion in the body multicolumn(1)(|c|)( Direction of movement ) & multicolumn(1)(c|)( Substance ) Blood to cells & 1. Cells to blood & 2.

Answer 1

Particles move in and out of cells by diffusion. During diffusion, particles spread out from where they are in high concentration to where they are in low concentration. Diffusion in the body: \begin{array}{|l|l|}<br\ />\hline\ \multicolumn{1}{|c|}{\ Direction\ of\ movement\ }\ &\ Substance\ \\<br\ />\hline\ Blood\ to\ cells\ &\ 1.\ Oxygen\ \\<br\ />&\ 2.\ Nutrients\ \\<br\ />\hline\ Cells\ to\ blood\ &\ 1.\ Carbon\ Dioxide\ \\<br\ />\hline<br\ />\end{array}

Answer 2

## Step 1: Understanding the concept of diffusion Diffusion is a process where particles move from an area of high concentration to an area of low concentration until they are evenly distributed. This process is the primary method for the movement of particles in and out of cells. ## Step 2: Filling in the blanks in the question Based on the understanding of diffusion, we can fill in the blanks in the question as follows: "Particles move in and out of cells by diffusion. During diffusion, particles spread out from where they are in high concentration to where they are in low concentration." ## Step 3: Understanding diffusion in the body The table in the question is asking for substances that move from the blood to the cells and from the cells to the blood. ### For the direction from blood to cells, the substances could be: 1. Oxygen: It is carried by the blood from the lungs to the cells where it is used for cellular respiration. 2. Nutrients: These are absorbed from the food we eat, enter the bloodstream, and are transported to the cells where they are used for energy, growth, and cell repair. ### For the direction from cells to blood, the substance could be: 1. Carbon Dioxide: It is a waste product of cellular respiration and is transported from the cells to the blood, which carries it to the lungs where it is exhaled.

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