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Lesson 07.02 Respiratory and Circulatory

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Dalenska Cetoute

on 2 December 2014

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Transcript of Lesson 07.02 Respiratory and Circulatory

Red Blood Cell or Erythrocytes start as immature cells in the bone marrow and after approximately seven days of maturation are released into the bloodstream. Unlike many other cells, red blood cells have no nucleus and can easily change shape, helping them fit through the various blood vessels in your body. There are three other components which are "Plasma, White Blood Cells and Platelets"
Red blood cells perform the most important blood duty. A single drop of blood contains millions of red blood cells which are constantly traveling through your body delivering oxygen and removing waste. If they weren't, your body would slowly die. They are also important in determining human blood type . Blood type is determined by the presence or absence of certain identifiers on the surface of red blood cells. These identifiers, also called antigens, help the body's immune system to recognize it's own red blood cell type.
In the heart
The most important function of red blood cells is the transport of oxygen. The haemoglobin absorbs oxygen in the lungs, travels through blood vessels and brings oxygen to all other cells via the heart.Oxygen and carbon dioxide are transported through the body via the cardiovascular system . As the heart circulates blood, oxygen depleted blood returning to the heart is pumped to the lungs. In the lungs, pulmonary arteries form smaller blood vessels called arterioles.
The human respiratory system is a series of organs responsible for taking in oxygen and expelling carbon dioxide. The primary organs of the respiratory system are lungs, which carry out this exchange of gases as we breathe.

Red blood cells collect the oxygen from the lungs and carry it to the parts of the body where it is needed. During the process, the red blood cells collect the carbon dioxide and transport it back to the lungs, where it leaves the body when we exhale.
When the Red Blood Cell come back from the lungs, it went through the Pulmonary Vein then into the Left Ventricle [One of four chambers of the heart. It is located in the bottom left portion of the heart below the Left Atrium, separated by the Mitral Valve] it went into the main Aorta. Then have to make the decision of going to the lower part of the body or the higher which is where the brain is located.
-There are 150 Billion red blood cells in one ounce of blood
-There are 2.4 Trillion red blood cells in one pint of blood.

-The human body manufactures 17 million red blood cells per second. If stress precipitates a need the body can produce up to 7 times that amount. (That’s up to 119 million red blood cells per second.)

-A red blood cell is around 7 microns in size. (A micron is one millionth of a meter).

-It only takes 20 to 60 seconds for a drop of blood to travel from the heart, through your body, and back to the heart again.
Once the Red Blood Cell get back from the heart it moves through the venules, veins, and on to the vena cava [Transport blood rich in carbon dioxide from the lower half of the body to the right atrium] in a deoxygenated state, and returns to the heart, only to begin its repetitive journey once again. This whole process has taken approximately 20 seconds!
Lesson 07.02 Respiratory and Circulatory
What is the systemic circulation?
Answer: The part of the cardiovascular system which carries oxygenated blood away from the heart to the body, and returns deoxygenated blood back to the heart.

What do the arteries, capillaries and veins do?

Answer: Arteries take blood away from the heart to the body organs and tissues. The artery wall is thick and muscular so it can withstand the high pressure of the blood being pumped directly from the heart.
Capillaries are tiny, thin-walled vessels which form a network to take blood through the organsand tissues.
Veins collect blood from the capillaries in the body and return the blood to the heart. The wall of the veins are thin, the blood is at a much lower pressure. To prevent the backflow of this lower pressure blood the veins contain valves

What factors affect blood pressure?

Answer: Peripheral resistance
• Vessel elasticity
• Blood volume
• Cardiac output
Concepts that need to be addressed
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