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delivers oxygenated blood, rich in nutrients and at high pressure. Can be narrowed or widened to control blood flow (eg. during exercise).
shape of an artery: o ||
shape of a vein: 0 | | |
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carries away deoxygenated blood, low in nutrients and at low pressure. Contains a high concentration of waste products.
shape of an artery: o ||
shape of a vein: 0 | |
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Definition
| very fine blood vessels one cell thick that cover a very large surface area. |
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| transport oxygen around the body |
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| remove microorganisms that cause infections by engulfing it. |
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| produce antibodies (proteins that help in the defence against disease) |
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| are cell fragments involved in blood clotting. They release blood clotting enzymes |
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| Why do animals need a circulatory system? |
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Definition
| To supply the body with oxygen and glucose as well as other substances to keep bodily functions running. |
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| the regulation of water between blood and tissues |
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| a scientist who specialises in the study of blood |
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| an inability to transport enough oxygen and can be detected by noting a lower than normal number of red blood cells. |
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| What organ is the renal artery & vein related to? |
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Definition
| The kidneys. renal artery carries oxygenated blood with high concentrations of urea to the kidneys. Renal vein carries blood with reduced urea concentrations back through the circulation. |
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| What organ is the hepatic artery & vein related to? |
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Definition
| The liver. The hepatic vein returns with a regulated, optimum concentration of food substances to the circulation. |
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| Where does the feromal artery & vein carry blood to & from? |
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Definition
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| True or False: The pulmonary artery carries blood to the brain. |
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Definition
| False; the pulmonary artery and vein carries blood to the lungs and back. |
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| How do dissolved substances move between the blood and tissues? |
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Definition
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| True or False: The ventricle receives blood at low pressure from the veins (coming from the lungs or tissues). |
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Definition
| False; the atrium receives blood at low pressure from the veins (coming from the lungs or tissues). |
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| What is the function of the pacemaker? |
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Definition
| To keep the electrical signals going from the heart. |
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Definition
| when the ventricles contract. |
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| when the heart walls are relaxed as blood returns into the atria. |
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| How is a person's blood pressure found? |
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Definition
| Systolic pressure divided by diastolic pressure. expressed as a fraction. |
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| Why can a pulse be felt at certain locations? |
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Definition
| Because the pulse can be felt where an artery can be pressed against a solid surface, such as a bone. |
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| What controls the distribution of blood? |
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Definition
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| What is Coronary heart disease (CHD) and how is it caused? |
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Definition
| CHD is where the coronary arteries (the artery that supplies the heart with blood) get blocked. If the artery gets blocked there is a chance for a heart attack, which happens from the result of the heart muscle not contracting. |
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| What do the semilunar valves prevent? |
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Definition
| Prevent blood from running back into the ventricles when pressure falls during relaxation. |
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| The three flaps of tricuspid valve prevent... |
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Definition
| blood from flowing back from ventricle to atrium during contraction. |
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| Where is blood pressure the highest in circulation? |
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Definition
| the aorta, the main artery of the body. |
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| True or False: the wall of the left ventricle has the thickest and most muscular wall since it needs to send blood to all tissues of the body. |
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Definition
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| True or False: The pacemaker is found in the wall of the left atrium. |
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Definition
| False; the wall of the RIGHT atrium. |
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