How do glucose and oxygen get into the blood to be used for respiration?

When we breathe we inhale oxygen from the air into our lungs. The alveoli are tiny air sacs in the lung where oxygen diffuses into the blood via small blood vessels, known as capillaries. The blood in these capillaries has a low concentration of oxygen which allows oxygen in the alveoli to diffuse down the concentration gradient and into the blood. When we eat food, it is broken down by enzymes, such as amylase, in the digestive system. Glucose is formed by the breakdown of carbohydrates in the small intestine. Glucose is then absorbed into the blood from the small intestine via the villi by active transport. Glucose and oxygen travel in the bloodstream and are taken up into cells. Respiration takes place in the mitochondria, producing energy.

Answered by Anna P. Biology tutor


See similar Biology GCSE tutors
Illustration of a video tutorial

Need help with Biology?

One to one online tuition can be a great way to brush up on your Biology knowledge.

Have a Free Meeting with one of our hand picked tutors from the UK’s top universities

Find a tutor

Related Biology GCSE answers

All answers ▸

What are the main differences between Eukaryotic and Prokaryotic cells?

What is the function of the mitochondria in cells?

Homeostasis is the maintenance of a constant internal environment i) Explain how shivering helps to regulate body temperate. ii) Explain how sweating helps to regulate body temperature (4 marks)

Describe 2 ways the body prevents the entry of microorganisms.

We're here to help

+44 (0) 203 773 us
Facebook logoTwitter logoGooglePlus logoLinkedIn logo

© MyTutorWeb Ltd 2013–2021

Terms & Conditions|Privacy Policy