Biology SL chapter 6.2 (The transport system)

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The chambers and vessels of the heart
Pulmonary artery, vena cava, aorta, pulmonary vein, left atrium, left ventricle, right ventricle, right atrium
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Role of arteries
The heart is a muscle which pumps blood around the body. Coronary arteries supply the muscles and tissues with oxygen and nutrients. these are necessary to create energy through aerobic respiration
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Explain the action of the heart pt1 (reoxygenation)
Blood returning from body enters right atrium via vena cava, this blood is deoxygenated. from there, it goes through the right ventricle, to the pulmonary vein to the lungs to be reoxygenated.
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Explain the action of the heart pt2 (movement of blood)
The blood returns to the left atrium via the pulmonary vein and passes through the left ventricle to the aorta, where it is pumped around the body
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How one-way flood of blood is maintained
When the atria contract,atrioventricular(AV)valves open,Blood flows from the atria into the ventricles.When the ventricles contract,AV valves close and semilunar valves open.This forces blood out of the ventricles and into the arteries.
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Control of heart beat pt1
The contraction of the heart tissue is myogenic, meaning it arises from within the muscle itself.In the walls of the atrium, there is the sinoatrial node (SAN), which acts as a pacemaker, as it initiates cardiac muscle contractions
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Control of heartbeat pt2
It stimulates atria to contract and stimulates the atrioventricular node (AVN), which sends signals which cause ventricular contaction. This sequence causes the delay between atrial and ventricular contractions
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Structure of arteries
Arteries carry high blood pressure, have a narrow lumen with a two-layer wall. First layer is muscular and can contract and stretch, while outer layer contains collagen to prevent rupturing from high pressure.
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Structure of veins
Veins carry low blood pressure, wide lumen with thin surrounding tissues, they also have valves to prevent backflow
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Structure of capillaries
Capillaries are involved in material and gas exchange with surrounding body tissue. Walls are a single cell thick for easy diffusion and they contain pores to aid in transport of materials.
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The four main components of blood
Plasma: fluid medium of blood, Erythrocytes: red blood cells, Leukocytes: white blood cells such as phagocytes, Platelets: responsible for blood clotting
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State the 7 things transported by blood
Nutrients, Antibodies, Carbon dioxide, Hormones, Oxygen, Urea, Heat
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Other cards in this set

Card 2

Front

Role of arteries

Back

The heart is a muscle which pumps blood around the body. Coronary arteries supply the muscles and tissues with oxygen and nutrients. these are necessary to create energy through aerobic respiration

Card 3

Front

Explain the action of the heart pt1 (reoxygenation)

Back

Preview of the front of card 3

Card 4

Front

Explain the action of the heart pt2 (movement of blood)

Back

Preview of the front of card 4

Card 5

Front

How one-way flood of blood is maintained

Back

Preview of the front of card 5
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