The blood system
- Created by: lavithedemon
- Created on: 13-04-16 08:49
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- Blood system
- arteries convey blood at high pressure from the ventricles to the tissue of the body
- elastic tissue that contains elastin fibres
- smooth muscles that contract
- Arteries have muscle and elastin fibres in their walls
- tunica externa - connective tissue
- tunica media - smooth muscle and elastic fibres
- tunica intima - lining of the artery
- The muscle and elastic fibres assist in maintaining blood pressure between pump cycles
- systolic pressure
- peak pressure
- vasoconstriction - increases blood pressure
- systolic pressure
- blood flows through tissues in capillaries with permeable walls that allow exchange of materials between cells in the tissue and the blood in the capillary
- veins collect blood at low pressure from the tissues of the body and return it to the atria of the heart
- Valves in veins and the heart ensure circulation of blood by preventing backflow
- pocket valves
- there is a separate circulation for the lungs
- pulmonary circulation
- systemic circulation
- the heartbeat is initiated by a group of specialised muscle cells in the right atrium called the sinoatrial node
- myogenic contraction
- sinoatrial node - group of cells
- arteries convey blood at high pressure from the ventricles to the tissue of the body
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