Page
  1. 1
    1
  2. 2
    2

Blood structure and function in the body.

Do not show me this again

Are you in the right place?

Jump to Biology and see how teachers think you should prepare in:

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

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

    4 star(s)

    and the formation of a 1,4-glycosidic bond. Depending on the monosaccharides used, this can be an ?-1,4-glycosidic bond or a ß-1,4-glycosidic bond. The reaction involves the formation of a molecule of water (H2O). This diagram shows two molecules of ?

  2. The Structure of Alveoli and their role in Gas Exchange including the role and ...

    The resulting sheet of cells is thin and delicate, often less than 2.0 µm (micrometres) thick. It is found within the alveoli because it needs to act as a readily permeable protective covering for molecules and ions in solution. This lays between the capillary network that is in very close proximity to the alveoli.

  1. Effects of exercise on cardiovascular system

    Nerve receptors in blood vessels and muscles signal the central nervous system consisting of brain and spinal cord to release hormones such as adrenaline and noradrenalin into the blood stream which increases the heart pressure. As blood pressure increases this speed up the time in which blood is transported round the body.

  2. heart essay

    When the heart is systolic (relaxed) all four valves are closed and blood is drawn into the atria's. When the atria's reach a certain pressure the two valves between the atria's and ventricles are pushed open and they let blood flow through into the ventricles.

  1. Marked by a teacher

    The Effect Of Temperature On The Permeability Of The Cell Membrane

    3 star(s)

    This is used to place the beetroots on in order to cut them in the accurate length .I will be using a while tile to place my beetroot onto, Why? The reason why I am using a white tile instead of black or any other is because using a white is easier to see.] * Colour Emitter- [What?

  2. Marked by a teacher

    Human Reproductive System

    4 star(s)

    It is attached to the suspensory ligament of the penis. Scrotum The scrotum is a loose pouch-like sac of skin that hangs behind the penis. It contains the testicles as well as many nerves and blood vessels. It protects and acts as a climate control system for the testes.

  1. Marked by a teacher

    What is Type 1 diabetes

    3 star(s)

    But learning about how the body functions, giving insulin injections, controlling diet and measuring the blood glucose levels, will help to restore family life and the child's life, back to normal. The healthcare teams at the children's wards can teach you about these areas.

  2. The Endocrine System

    The pineal gland is an extremely small gland found in the roof of the forebrain. 2. The endocrine system is the body's control system composed of glands that maintain a stable internal environment by producing chemical regulatory substances called hormones.

  • Over 180,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work

Marked by a teacher

This essay has been marked by one of our great teachers. You can read the full teachers notes when you download the essay.

Peer reviewed

This essay has been reviewed by one of our specialist student essay reviewing squad. Read the full review on the essay page.

Peer reviewed

This essay has been reviewed by one of our specialist student essay reviewing squad. Read the full review under the essay preview on this page.

Do not show me this again

Are you in the right place?

Jump to Biology and see how teachers think you should prepare in: