Teacher Demo/Student Activity: Limit to Cell Size

41800307 - main blood cells in scale isolated on white background

41800307 – main blood cells in scale isolated on white background

Introduction 

Cells require a constant supply of glucose and oxygen to produce energy.  Cellular respiration occurs in the mitochondria of a cell. As a result of this process, large quantities of waste carbon dioxide must be expelled from the cell. All materials involved in this reaction are either imported or exported through the cell membrane by diffusion.

Students observe the effect of cell volume and surface area on the extent of diffusion of the sodium hydroxide solution through the “cell”.

teacher-demo-student-activity-limit-to-cell-size

Balancing Utensils Table Trick – Sick Science! #009

 

With the holidays just around the corner, you might still be looking for just the right gift for someone… especially if you’re a kid. Our science guy, Steve Spangler, is here to show us how to make an amazing tie-dye t-shirt without the inconvenience or mess. Continue reading