• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Blood structure and function in the body.

Extracts from this document...

Introduction

Blood Blood can be defined as: the circulating fluid (plasma) and suspended formed elements, such as red blood cells, white blood cells and platelets in the vascular system of humans and other vertebrates. This essay will mention about structure of the blood and the functions of the blood. Structure of blood has four major parts these are: plasma, red blood cells, white blood cells, and platelets. Plasma is mainly made up from water; nearly %90-%92 is water. This is a straw coloured fluid. ...read more.

Middle

They only exist for 120 days in body and there are approximately 4.5 - 5.8 million erythrocytes per micro-litre of healthy blood. This quantity depends on gender and age. White blood cells also named as leucocytes. There are different types of leucocytes. These can be defined as; granular and agranural. Depending on their types, they sometimes exist for few hours to few days but sometimes they can exist for many years. Platelets also called as trombocytes. These are granular and disk-shaped cell fragments. ...read more.

Conclusion

Blood also carries nutrients for our body cells. There are too many reactions happen in our body with the help of enzymes and these enzymes need optimum conditions to work well. One of these optimum conditions is: pH and pH is controlled by blood. Toxins are harmful for our body when the blood takes waste products from our cells than it goes to kidney. Kidney filters the blood and the toxins that filtrated from the blood are removed from the body in the form of urine. Blood plays a very important role in our body. It has very important functions and specialized structure to do them. Blood have a vital job in our body, without blood we could not exist. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Exchange, Transport & Reproduction section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Here's what a teacher thought of this essay


None

Marked by teacher kerry jackson 19/02/2012

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Exchange, Transport & Reproduction essays

  1. Marked by a teacher

    Investigate the water potential of celeriac.

    5 star(s)

    This shows that celeriac must have a less negative water potential than the carrot and potato. I think this because it has much less solutes dissolved in its cells. After the reducing sugars test, I placed the test tubes into a colorimeter.

  2. Marked by a teacher

    Describe the molecular structure of starch (amylase), glycogen and cellulose, and relate these structures ...

    4 star(s)

    This diagram shows two molecules of ? glucose forming a disaccharide: This shows two glucose molecules joining together to form the disaccharide maltose. Because this bond is between carbon 1 of one molecule and carbon 4 of the other molecule it is called a 1-4 glycosidic bond.

  1. Marked by a teacher

    The Effect Of Temperature On The Permeability Of The Cell Membrane

    3 star(s)

    The control in this particular experiment will be the calibration of the colorimeter. This is due to the fact that the colorimeter reads the light absorbance. Therefore according to this the distilled water will be used to make sure that temperature is the only variable that will affect the final results.

  2. heart essay

    When the heart is diastolic (contracting) it squeezes blood out through valves into the arteries. Blood travels around the circulatory system via vessels. There are three main types of vessels; arteries, veins and capillaries. Arteries and arterioles (smaller arteries) carry blood away from the heart, for example the pulmonary artery

  1. Osmosis in Potato cells

    Method of drying the potato. If some potatoes were dried a lot and some were not then the mass would differ as it would include the excess water, again making the results inaccurate. A method of drying the potato chips was agreed and all chips were dried in exactly the same way.

  2. Effects of exercise on cardiovascular system

    The average resting rate per minute can be calculated as following: Average resting heart rate = resting heart rate in all recordings � number of times repeated Therefore: Subject A: (80 + 80 + 76) � 3 = 79 Subject B: (76 + 80 + 72)

  1. Kidney Function.

    * The renal pyramids project into a central space called the pelvis Urine passes out into the pelvis before it passes down the ureter. The nephron is the functional unit of the kidney. At one end of the nephron is the cup-shaped Bowman's capsule.

  2. Describe the structure and purpose of the lymphatic system .

    These lymph nodes produce lymphocytes that actively help in the defence system of the body by filtering microorganisms and keep foreign substances out the body. Lymph nodes are a bean shaped that are enclosed by fibrous capsules. These lymph nodes are on the lymph ducts.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work