Model Muscle

This guide shows how to construct a model of a muscle. The finished model can be used in demonstrations to show how when a muscle contracts, it pulls tendons. Two 'muscles' could also be used to construct a model arm with one representing the bicep and one the tricep.

Fig 1: End cap

Fig 1 shows a single end cap. These could be made from the closed end of a Pringles tube or yoghurt pot or as in this photo below, a strip of corrugated cardboard glued into a loop. The diameter of each end piece needs to be anywhere between 5-15cm. you will need two end caps for each muscle.

Fig 2: Straws are glued into place

Fig2 shows the straws having been glued into place. These need to be spaced evenly around the inside of each cap end and glued into place. A glue gun or sticky tape could be used to secure the straws.

Fig 3: Bunsen tubing with the balloon attached to one end

Fig3 shows the length of Bunsen tubing with the balloon attached to one end. This can simply be taped into place ensuring that no air can leak from the join. The photo also shows the completed muscle tube with both end caps in place.

Fig 4: Balloon is inserted into the tube and inflated

Fig4 shows the balloon having been inserted into the tube and inflated. Inflation makes the straws bend outwards, pulling the end caps toward each other. A length of string can be attached to each end cap. These strings represent tendons. The inflation of the balloon represents muscle contraction, pulling the 'tendons'.

Before attempting any of the construction projects featured on this website, ensure you have, and know how to use, the appropriate tools, components and safety equipment and are competent to undertake the project. These guides are for information only and we hold no responsibility for any accidents, injuries or damage caused by the use or misuse of any equipment, project or information contained within this website. In short - use common sense and stay safe!