The Blood System
- Created by: NWILKA1
- Created on: 27-05-14 11:21
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- The Blood System
- Circulatory system
- Transports substances around the body.
- Two separate sirculatory systems
- One for the lungs
- One for all other organs in the body.
- Heart
- Organ
- Pumps blood around the body.
- Wall of the heart is made from muscle tissue.
- 4 main chambers
- Left and right atria
- Left and right ventricle
- Blood enters the atria of the heart.
- The atria contract and force blood into the ventricals.
- The ventricals force blood out of the heart.
- Valves in the heard ensure blood is flowing in the right direction.
- Blood flows from the heart to organs throw arteries and return throught veins.
- Valves in the heard ensure blood is flowing in the right direction.
- The ventricals force blood out of the heart.
- The atria contract and force blood into the ventricals.
- Arteries
- Thick walls containing muscle and elastic fibre.
- If arteries begin to narrow and restrict blood flow stents are used to keep them open.
- Veins
- Thinner walls than arteries
- Have valves to prevent back-flow.
- Capillaries
- Have very narrow, thin walls.
- Substances needed by the body pass out of the blood,
- Substances produced by cells pass into the blood
- Have very narrow, thin walls.
- Circulatory system
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