Bring oxygen rich blood from heart to all body cells, thick walls, highly elastic and high pressure to pump round the body
Circulatory System is also known as:
Cardiovascular System
Function of Circulatory System
Allows the blood to circulate and transport nutrients, oxygen, carbon dioxide, hormones and blood cells around the body.
Pulmonary Circuit
Carries blood to lungs to be oxygenated, goes back to heart where oxygen is taken by red blood cells
Systemic Circuit
Carries oxygenated blood around body to deliver it, the returns to heart. This circuit also carries nutrients and waste
Pulmonary artery
transfers deoxygenated blood away from heart to lungs
Pulmonary Vein
transfers oxygenated blood from lungs to heart
lymphocytes
release antibodies and activate t-cells to kill infected cells and stimulate immune response
Erythrocytes
No nucleus to enable to carry oxygen which attaches to haemaglobin ( protein) transported to target organs/ tissues
plasma
carries substances like nutrients, sugar, salts and transports blood cells to target organs/ tissues
Right Atrium
First chamber to receive deoxygenated blood returning from body
Tricuspid Valve
Prevent back flow of blood from right atrium into right ventricle
Right Ventricle
Deoxygenated Blood flows into right atrium and passes through tricuspid valve and into right ventricle which pumps blood up through pulmonary valve and through pulmonary valve and through pulmonary artery to the lungs
Bicuspid Valve
Permits blood to flow one way only, from left atrium into left ventricle
Aorta Distributes oxygen rich blood to all parts of body
Pulmonary Vein
Responsible for carrying oxygenated from lungs back to left atrium of heart
Left Atrium
Holding chamber for blood returning to the lungs and act as a pump to transport blood to other areas of heart
Left Ventricle
Thickest part of heart chambers
Responsible for pumping oxygenated blood to tissues all over body
Capillaries
Allow exchange of material la between blood and body cells via tissue fluid
Capillaries have thin endothelium cells of one cell thick
Decreases distance materials have to travel to be exchanged.
1 blood cell thick
Capillaries become venules
Erythrocytes function
Has no nucleus which enables the cell to carry oxygen
Attached to haemoglobin to target organs/tissues
Leukocytes function
Fights diseases/ infection to support the immune system
Ingests/ destroys pathogens
Platelets/ Thrombocytes
clumps together to form a blood clot
Act in association with thrombin and oxygen
Plasma function
Carries substances nutrients/ sugars/ salts
Transports blood cells to target organs / tissues
Veins
Carry deoxygenated blood towards the heart
Have valves to prevent backflow - structure not really functional