Circulatory System
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What does blood transport around your body?
oxygen, carbon dioxide, nutrients, waste products and hormones
Name the 4 components which make up your blood
red blood cells white blood cells platelets plasma
what is the function of the red blood cell
contains haemoglobin- transport oxygen no nucleus- allows more room to carry oxygen biconcave disc shape-increases surface area
what is the function of the white blood cell
defends the body against disease shape means it can fir through the capillary walls
what is the function of platelets
fragments of cells- involved in blood clotting
what is the function of plasma
carries hormones, carbon dioxide, soluble nutrients and urea distributes heat around our body
where is oxygen and glucose supplied to the heart from?
the coronary arteries
rank the four components of blood from highest to lowest of their percentages in our body
• plasma • red blood cells • white blood cells and platelets (>1%)
which side of the heart keeps oxygenated blood?
left hand side
which side of the blood keeps deoxygenated blood
right hand side
the heart is an organ made from ….
cardiac muscle
the heart —— to pump blood around the body
contracts
what does a double circulatory system mean?
the blood flows through the heart twice before completing a full circuit of the body
In the right hand side of the heart, is there tricuspid or bicuspid valves?
Tricuspid Valves
In the left hand side of the heart, is there tricuspid or bicuspid valves?
Bicuspid Valves
name the steps for the QER question of ‘ describe the route of the blood as it flows through the heart
• Firstly, deoxygenated blood from the organs enters the heart through the vena cava. • Then, the blood fills the right atrium which then contracts , forcing the blood down to the right ventricle • A tricuspid valve will prevent back flow and keeps the flow flowing in one direction. • Then the right ventricle contracts which forces the blood out of the heart and along the pulmonary artery, to the lungs. • A semi lunar valve will prevent back flow into the heart. • Blood then become oxygenated in the lungs before travelling back to the heart via the pulmonary vein. • The oxygenated blood then fills the left atrium. • Contractions will then force the blood down into the left ventricle and a bicuspid valve prevents back flow • The left ventricle then contracts and pushes the blood out under high pressure through the aorta, which supplies the whole body with oxygenated blood and the semi lunar valves will prevent back flow into the heart.
why are the walls of the left ventricle thicker than the walls of the right ventricle
because it needs to contract with greater force so the blood will reach the whole body instead of just the lungs
arteries carry blood…
away from the heat
veins carry blood….
to the heart
where are capillaries found?
within tissues and organs
name 3 risk factors for cardiovascular disease
• lack of exercise • smoking • high blood pressure
describe the vena cava
carries deoxygenated blood from the body to heart
describe the semilunar valves
flaps that prevent backflow of blood
describe the left atrium
receives oxygenated blood from the lungs