MYTUTOR SUBJECT ANSWERS

759 views

What is the difference between an artery and a vein?

Arteries and veins both carry blood around the body, and they each have three main layers of tissue (a ring of endothelial tissue at the centre of the blood vessel surrounded by a layer of muscle and elastic fibres, which is surrounded by a layer of connective tissue).

However, there are several differences between them:

1. Arteries carry blood from the heart to the rest of the body, whereas veins carry blood from the rest of the body back to the heart.

2. Almost all arteries carry oxygenated blood and almost all veins carry deoxygenated blood. The only exceptions are the pulmonary artery, which carries deoxygenated blood from the heart to the lungs, and the pulmonary vein, which carries oxygenated blood from the lungs to the heart.

3. Arteries have a thick elastic muscle layer, whereas the muscle layer for veins is much thinner. This is because the heart pumps blood into the arteries at high pressures, so the walls of the arteries must be able to cope with the changes in pressure during a heartbeat. Veins carry blood at much lower pressures so do not need such a thick wall.

4. Arteries have a much narrower lumen (the hole at the centre that the blood flows through) than veins. This helps keep higher blood pressures in the arteries, which is needed to keep blood flowing quickly to body tissues. 

5. Veins have valves and arteries do not. In arteries, blood flows in the right direction because of the heart pumping it forwards at high pressures. The lower blood pressure in veins means that valves are needed to stop blood flowing backwards (for example, in veins in the legs, blood needs to flow upwards against the pull of gravity).

Emily W. GCSE Biology tutor, GCSE Chemistry tutor, A Level Maths tuto...

1 year ago

Answered by Emily, who has applied to tutor GCSE Biology with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

235 SUBJECT SPECIALISTS

£18 /hr

Sajidah H.

Degree: Mathematics (Bachelors) - Birmingham University

Subjects offered: Biology, Maths+ 2 more

Biology
Maths
Further Mathematics
-Personal Statements-

“I am a Mathematics student at the University of Birmingham. I have a genuine love for Maths and eventually want to go on to teach it to young people. I am friendly and very patient, and if you’re struggling, we’ll work together to fin...”

MyTutor guarantee

£20 /hr

Anna Liisa J.

Degree: Biomedical Science (Bachelors) - Kings, London University

Subjects offered: Biology, Economics+ 1 more

Biology
Economics
Chemistry

“My name is Anna Liisa Jalakas and I am a biomedical sciences student. I completed my IB diploma in June of 2016 where I achieved a total of 40 points with a 7 in Biology and Economics, and a 6 in Chemistry. I also have IGCSE qualifica...”

£20 /hr

Katja H.

Degree: MA Geography and Politics (Bachelors) - Glasgow University

Subjects offered: Biology, Maths+ 3 more

Biology
Maths
Geography
French
English

“I'm a student of Geography and Politics at Glasgow Univeristy. I have always loved Geography and believe that studying it is like studying for a degree in interesting conversations :)My experience tutoring also includes Biology, Fren...”

About the author

£18 /hr

Emily W.

Degree: Medicine (Bachelors) - Cambridge University

Subjects offered: Biology, Maths+ 1 more

Biology
Maths
Chemistry

“Top tutor from the renowned Russell university group, ready to help you improve your grades.”

MyTutor guarantee

You may also like...

Posts by Emily

What is the difference between an artery and a vein?

Why is chlorine more reactive than bromine?

Other GCSE Biology questions

Describe the reflex arc.

What is the cardiac cycle?

(Biology GCSE) How does the body control blood glucose concentration?

What is the difference between Aerobic and Anaerobic respiration?

View GCSE Biology tutors

Cookies:

We use cookies to improve our service. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok