heart assignment

Essay by poop9000Junior High, 8th gradeB+, June 2014

download word file, 4 pages 0.0

The Heart

In an average human body there is about 5 litres of blood. In an average human day, the average human heart pumps about 100,000 times and that average human heart pumps about 7,000 litres of blood around that humans body every day… Average? I think not.

Blood contains Plasma, red blood cells, white blood cells and platelets.

Plasma- Contains serum, fibrinogen. Plasma makes up 55% of blood. Plasma is mostly water (93%).

Serum- Is the blood plasma without the fibrinogen.

Fibrinogen- Is a soluble glycoprotein (protein that contains glycan) and is made by the liver.

Red Blood Cells- Contain Haemoglobins (an iron-containing protein, which transports oxygen). Red Blood Cells make up 45% of your blood. Red Blood Cells live for about 120 days. You have 700 Red Blood Cells for every White Blood Cell.

White Blood Cells- are cells that have the job of defending the body against both infectious diseases and foreign materials.

White Blood Cells live for a week. White Blood Cells and Platelets make up less than 1% of your blood.

Platelets- Are responsible for clotting the blood when the skin is damaged. They change fibrinogen into fibrin. This fibrin creates a sticky barricade which red blood cells are caught and gathered, which then stops more blood from leaving the damaged area and also helps to prevent bacteria from entering the damaged area.


1. When first giving blood you need to fill out a health-based questionnaire, but you have to be 16 years or over to donate. You also get free drinks while you wait!

2. You next get a blood sample taken to see if you have a high enough haemoglobin level. If healthy, you get to begin the process of giving blood.

3. You get to sit...