Logged out
Access All our Essays in an Instant
Swap your work for FREE access, or pay £4.99 for instant access
Discuss how the heart and circulatory system maintain a continuous unidirectional flow of blood and how this flow is regulated according to the body's needs.
Member rating: No Rating | Words: | Submitted: Sat Jan 29 2005
Page Preview
On the left is an image preview of every page of this document, and below are the first 150 words with formatting removed:
Discuss how the heart and circulatory system maintain a continuous unidirectional flow of blood and how this flow is regulated according to the body's needs. Production of regular pulse - impulse transmission in heart The regular heart beat and pulse is produced by contractions of the heart muscle during the cardiac cycle. These contractions are caused by an electrical stimulus called the cardiac impulse. This natural pacemaker of the heart, called the Sinoatrial node, is located in the Right Atrium. The electrical impulse leaves the Sinoatrial node and travels to the right and left Atria, causing them to contract together. After contraction, there is a period of insensitivity to stimulation which allows the Ventricles to fill with blood. The impulse now at the Atrioventricular node moves to the Bundle of His then divides into the Right and Left Bundle Branches where it spreads, using Purkinje Fibers, to the muscles of the Right...
Get instant access
- Instant, unlimited access to our documents in full
- Swap your work for free access, or pay £4.99
- To see the full version of this document and 146,168 others
Receive email updates for this category
- Simply tell us your email address and receive a weekly Study Help Email for FREE
- Receive 3 FREE essay views with each email
- Get all the latest essays from Coursework.Info & discussion from TheStudentRoom.co.uk
