News Update :

Human Circulatory System - 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.
The heart is composed of:
a. the right atrium
b. Right cubicle
c. left atrium
d. the left ventricle
- 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).

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.


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.


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

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
Share this Article on :

0 komentar:

Posting Komentar


© Copyright Hijamah Education 2010 -2011 | Design by Bekam Center | Published by Bekam Tangerang | Powered by