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Transportation in human beings

Introduction

     Transportation whether in plants or animals is the key to the efficient assimilation of the nutrients that the organisms synthesise, get from their environment or digest.

Components of Blood

     Haemoglobin is composed of an iron containing pigment called haeme and a protein called globin.

Components of Circulatory System in Human

     The damaged platelets release a substance called thromboplastin. This sets in action, a series of reactions that result in the formation of clots.

Human heart

     The human heart is a muscular, cone-shaped, hollow organ about the size of a fist (about 12cm in length and 9cm in breadth).

The Heart Beat

     The heart beat results in electropotential differences spreading over the heart muscles. These follow a specific pattern. Any change in the pattern indicates an abnormality.

Characteristics of Blood Pressure

     The pressure created during the ventricular systole is called the systolic pressure and is equal to that exerted by 120 mm column of Hg (mercury).

Processes Involved in Transport

     It is a physical process that involves the movement of solute particles from the region of their higher concentration to the region of their lower concentration.

Physiology of Transpiration

     Transpiration is the loss of water from the aerial parts of the plant in the form of water vapour.

Summary

     # Vascular system in plants relies mainly on physical processes whereas transport in animals utilises muscular energy.


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Multiple Choice Questions

     



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