If the surface area of a cell membrane is modeled as a sphere with a radius of 5 micrometers, what is its approximate surface area (using π ≈ 3.14)?

If an anatomical structure is described as 'proximal' to another, what mathematical concept best describes their relative position?

Epithelial tissue cells are arranged in layers. If a tissue has 5 layers of cells, and each cell layer is, on average, 20 micrometers thick, what is the total thickness of the tissue?

The dermis layer of the skin contains collagen fibers. If the density of collagen fibers in a 1 mm³ sample is 1000 fibers, and each fiber has an average diameter of 1 micrometer, what's the approximate total cross-sectional area of collagen fibers in that sample?

If the rate of cell division doubles every hour, and you start with one cell, how many cells will there be after 5 hours?

The anatomical term 'superior' refers to being above. If structure A is 'superior' to structure B, what type of spatial relationship is being described?

If a tissue sample contains 20% adipose cells and the entire sample measures 5 cm³, what volume (in cm³) is occupied by adipose cells?

If the epidermis has an average thickness of 0.1 mm and the dermis has an average thickness of 2 mm, what percentage of the skin's total thickness does the epidermis represent?

A cell's volume increases from 100 μm³ to 121 μm³ over an hour. What's the percentage increase in volume?

If the body is divided into four quadrants using the median and transverse planes, what mathematical concept is being used?