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Human Circulatory System


www.pendidikanbekam.com - human circulatory system is called a closed circulation because blood flows in the veins. Circulatory system in humans also called duplicate because the blood circulation through the heart 2 times.

Circulation in humans split second:
- The circulation of the blood: the heart (left atrium) - the left ventricle - arteries - whole body - veins - right atrium
- Blood circulation is small: the right atrium - right chamber - pulmonary arteries - lungs - left atrium

Circulatory system in humans include: heart, blood vessels, and blood.
A. HEART
The heart is composed of:
a. the right atrium
b. Right cubicle
c. left atrium
d. the left ventricle
Note:
- Left ventricle bigger as the hardest working, which pumps blood around the body.
- The right side of the heart (right atrium and right chamber) containing gross blood (CO2), while the left heart (left atrium and left ventricle) contains a lot of clean blood (O2).

B. BLOOD VESSEL
Blood vessels are divided 2.
1. Blood vessels leaving the heart: arteries / artery
2. The blood vessels to the heart: veins / vein.

Differences arteries and veins:
- It was located in the arteries, veins near the skin surface that
- Arteries thick, strong and elastic, if the veins are thin and inelastic
- Arterial pulse feels, when veins are not
- If the injured arterial venous blood that dripped memenacar.

C. BLOOD CIRCULATION 


D. DEVELOPMENT OF BLOOD COMPONENTS
Components of the blood consists of blood plasma (fluid) and the cells making up the blood.
1. Blood plasma
95% of blood plasma consists of water. In blood plasma contained a blood clotting factor, ie protombin and fibrinogen. Blood plasma without fibrinogen is called serum.

2. Erythrocytes (red blood cells)

- Flattened round, concave (bikonkaf)
- Do not have a cell nucleus
- Contain hemoglobin which makes blood red
- Are produced in the bone marrow flat and pipe
- Overhauled erythrocytes in the spleen

3. Leukocytes (white blood cells)
- Shape change
- Has a core
- No color
- Produced in the red bone marrow, lymph nodes, and spleen
- Serves to protect the body from germs and bacteria by eating produce antibodies

4. Platelets (platelets)
platelets play a role in blood clotting.

E. FREEZING PROCESS OF BLOOD

Wound, platelets rupture -> trombokinase -> protombin (with the help of calcium and vitamin K) -> thrombin -> fibrinogen -> fibrin threads. 

F. DISEASE-DISEASE
1. Anemia: lack of red blood cells (erythrocytes).
2. Hemophilia: a hereditary disease with symptoms of difficult blood clot
3. Atherosclerosis: blockage of blood vessels by fat
4. Arteriosclerosis: blockage of blood vessels by calcium
5. Thalassemia: erythrocyte shape flawed / incomplete resulting in lower oxygen binding ability
6. Hemorrhoids (piles): dilation of the veins around the anus
7. Leukemia: leukocyte production superfluous

Source: The Sporting From Various Sources
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