The science of nutrition and healthy eating
The science of nutrition and healthy eating

Start this free course now. Just create an account and sign in. Enrol and complete the course for a free statement of participation or digital badge if available.

Free course

The science of nutrition and healthy eating

1 Holes, tubes and valves

The food tube running through the body (Figure 1) is extremely coiled. When opened out, it is about 7.5 to 8 metres long (the length varies with body size and nutritional status). It also has valves (muscular ones called sphincters) allowing the food to move one way only – under normal circumstances. Generally, these sphincters work automatically, although we have control over the one at the far end!

Described image
Figure 1 The main organs of the digestive system

Take your learning further

Making the decision to study can be a big step, which is why you'll want a trusted University. The Open University has 50 years’ experience delivering flexible learning and 170,000 students are studying with us right now. Take a look at all Open University courses.

If you are new to university level study, find out more about the types of qualifications we offer, including our entry level Access courses and Certificates.

Not ready for University study then browse over 900 free courses on OpenLearn and sign up to our newsletter to hear about new free courses as they are released.

Every year, thousands of students decide to study with The Open University. With over 120 qualifications, we’ve got the right course for you.

Request an Open University prospectus