Transportation in Animals and Plants 1.pptx

THE POWER POINT PRESENTATION IS ABOUT CLASS7 Science Subject lesson7.The lesson name is the transportation of substances in plants and animals.

1. E-CONTENT PREPARATION CLASS – VII SCIENCE CHAPTER-11 TANSPORTATION IN ANIMALS AND PLANTS

2. CIRCULATORY SYSTEM The organ system that transports various essential items like food, oxygen , carbon dioxide etc. inside our body is called circulatory system COMPONENTS OF CIRCULATORY SYSTEM

3. BLOOD The red coloured fluid that flows or circulates inside our body is called as blood. *It acts as means of transport for food, oxygen & carbon dioxide in our body.

4. RED BLOOD CELLS (RBC) They are also called as erythrocytes . They are red coloured spherical & biconcave cells. They contain a protein called haemoglobin which gives red colour to them. Haemoglobin is the carrier of oxygen as it combines with oxygen and carries it to all cells of the body.

5. WHITE BLOOD CELLS (WBC) They are also called as leucocytes. They are the cells of the immune system. They are also called as body guards as they fight with the disease causing germs & foreign invaders and kills them. WHITE BLOOD CELLS FIGHTING WITH GERMS

6. PLATELETS They are also called as thrombocytes . They are small colourless cell fragments in our blood. They form clots and stop or prevents bleeding from cut or wounds.

7. BLOOD VESSELS There are three main types of blood vessels- ARTERIES , they always carry oxygen rich (oxygenated) blood except pulmonary artery , away from the heart to all the body parts. They have thick walls. VEINS , these are blood vessels that take carbon dioxide rich (deoxygenated) blood except pulmonary vein , back to the heart from body parts. They have thin walls. They have valves inside them which allow blood to flow only towards the heart. CAPPILARIES , these are the small blood vessels that connect the arteries and the veins .Their thin walls allow oxygen, nutrients, carbon dioxide, and other waste to pass to and from the cells.

8. The heart is the key organ in the circulatory system which beats continuously to act as a pump for the transport of blood which carries other substances with it. The heart is located just to the left of the centre of chest cavity with its lower tip slightly tilted towards the left. It is of the size of our clenched fist.

9. INTERNAL STRUCTURE OF HUMAN HEART Internally it is four chambered. The upper two are atria & two lower are ventricles

10. SCHEMATIC DIAGRAM OF CIRCULATION OF BLOOD

11. Heart Beat The walls of the heart are made up of cardiac muscles which contracts and relax rhythmically . This rhythmic contraction followed by its relaxation constitute a heart beat. It is recorded by an instrument called as stethoscope Its normal value is 70-80 per minute.

12. PULSE & PULSE RATE The jerks felt in the wrist arteries due to heart beat is called as pulse. The number of pulse per minute is called as pulse rate. Each heart beat generates one pulse in the arteries and the pulse rate per minute indicates the rate of heart beat i.e , 70 -80 per minute

13. EXCRETORY SYSTEM IN HUMANS It comprises of a pair of kidneys, two ureters, a muscular bladder ,urethra and urinary opening. When the blood comes to the kidneys, useful substances are absorbed back ,and the wastes dissolved in water are removed as urine. An adult human passes about 1-1.8 L of urine in 24 hours. The urine consists of 95% water, 2.5% of urea and 2.5% other waste products

14. EXCRETORY WASTE PRODUCTS OF SOME ANIMALS ANIMAL EXCRETORY PRODUCT AQUATIC ANIMALS LIKE FISHES AMMONIA LAND ANIMALS LIKE BIRDS,SNALES & LIZARDS URIC ACID HUMANS UREA DIALYSIS The process of artificial filtration of blood by means of machines due to the failure of kidneys, is called dialysis. TRANSPIRATION The process of loss of water from the surface of leaves through stomata (small pores) , is called transpiration.

15. TRANSPORT OF WATER , MINERALS AND FOOD IN THE PLANTS Transportation in plants takes place by means of pipe like structures formed by a special conducting tissue called as vascular tissue . It is of two types named as xylem & phloem. Xylem transports water along with dissolved minerals while Phloem transports food prepared by leaves. Suction pull developed due transpiration, pulls water from roots to the top of the plant.

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