This one is an attempt to write a mathematical function which looks like the biceps muscle. I have plotted the biceps in both relaxed and contracted state. Below, I will walk you through the process of how to go about constructing such a function (But will not mention the actual functions *of course*). Firstly make a spiral. In the figure, you can observe the spine of the spiral which is red in color. The parametric equations are given below.

x = r Cos[**a** t] ; y = r Sin[**a** t] ; z = t ; ** a** is a constant which controls the frequency of the turns;

*is the radius;*

**r**You should now make a * spindle *out of it. The spindle is made by controlling the radius along the spiral’s length. Also you should bend it’s

**spine.**That is shown below.

In the next step, make several of such things and rotate them around an axis. You will now get a biceps model. (A 3-D Image might have given a better view but that cannot be done here)

## Wire-frame Models:

#### 1. Relaxed State

#### 2. Contracted State

After testing using wire-framed models, I have plotted the surface. They are shown below.

## Surface Models:

#### 1. Relaxed State

#### 2. Contracted State

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A diagram of the contracted and relaxed biceps muscle can be seen here

When I make models of other muscles, I will certainly post them.

😀

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