Biol261

1. PLANES These are imaginary cuts through the body used to describe positions or to slice for scans (like MRIs and CTs). • Coronal Plane: Cuts the body front to back (like separating your face from the back of your head). • Sagittal Plane: Cuts the body left and right (a nose-split kind of line). • Transverse Plane: Cuts the body top to bottom (like slicing at your waist).

1. Nucleus • Function: Acts as the control center of the cell, containing the cell’s genetic material (DNA). It controls gene expression and cell activities like growth, metabolism, and reproduction. • Structure: It’s surrounded by a double membrane called the nuclear envelope, which has pores to allow the movement of molecules in and out. 2. Mitochondria • Function: Known as the powerhouse of the cell, mitochondria generate ATP (adenosine triphosphate), the energy currency of...