Life Processes- Transportation Blog 1

LIFE PROCESSES   (CLASS 10)
Lesson 9

Welcome back students!   😊😊

In our today’s session we will be studying about Transportation.

 Important Instructions:
1. Text written in red need to be copied in your biology note book.
2. Diagrams need to be drawn and need to be labelled.
At the end of this topic, the learner will be able to :

- write component of blood circulatory system.
- explain composition of blood.
- state the functions of different component of blood.
- explain the structure of heart.
- explain the working of heart.


Blood consists of a fluid medium called plasma in which the cells are suspended. Plasma transports food, carbon dioxide and nitrogenous wastes in dissolved form. Oxygen is carried by the red blood cells. Many other substances like salts are also transported by the blood. 

 The human transportation system consists of blood, capillaries and heart.



  1. BLOOD

  i)   Blood is a fluid connective tissue.
ii)   It has a fluid matrix called plasma.
iii)   Blood cells are suspended in plasma.



iv) The main components of Blood are plasma, RBC, WBC, PLATELETS.

    (COPY THE POINTS FROM THE THREE PICTURES BELOW)

 I. PLASMA- The liquid part of blood is called plasma. It is a colourless liquid which consists mainly of water with many substances dissolved in it. It contains about 90% water. It also contains dissolved substances such as protein, digested food, salts, waste products and hormones.

 II. Red Blood Cells- RBC's do not have nuclei, this is one reason for the short life of red blood cells. The average life span of RBC's is 120 days.
III. White Blood Cells- These are called as soldiers cells as they fight against germs and bacteria which causes diseases. They are either spherical or irregular in shape. All WBC's have a nucleus but are less in numbers as compared to RBC's.

IV. Platelets- Platelets are the tiny fragments of special cells formed in the bone marrow. They help in the coagulation of blood or clotting of blood.


 FUNCTIONS OF BLOOD—PLEASE COPY THE POINTS

https://youtu.be/j9Hdl9w-K0M

(watch the video through the link)  👆

 2. BLOOD VESSELS and CAPILLARIES (Copy the points)
C. HUMAN HEART

 Structure of Human Heart: 
HUMAN HEART 
(draw fig 6.10 page 106 ncert)

 Structure of Heart
1. The heart is a muscular organs which is as big as our fist.
2. Our heart is 4 chambered. As both oxygen and carbon dioxide have to be transported by the blood, the heart has to prevent the mixing with blood. 
3. The carbon dioxide rich blood has to reach the lungs for the carbon dioxide to be removed, and the oxygenated blood form the lungs has to be brought back to the heart. 
4. The oxygen rich blood is then pumped to the rest of the body.

Working of Heart
(draw diagram 6.11 page 106 ncert)
1. When the muscles of all four chambers of heart are relaxed, the pulmonary vein brings the oxygenated blood from the lungs into the left atrium of the heart.

2. when the left atrium contract, the oxygenated blood is pushed into the left ventricle.

3. when the left ventricle contracts, the oxygenated blood is forced into the main artery called aorta. This main artery then branched into smaller arteries which go into different body organs except lungs.

4. The mail artery carries blood to all the organs of the body like head, chest. arms, stomach, intestines, legs except lungs. when the oxygenated blood passes through the capillaries of the body organ then it gives oxygen to the body cells. Also, the carbon dioxide produced enters the blood.

5. When the right atrium contracts, deoxygenated blood is pushed into the right ventricles.

6. When the right ventricles contracts, the deoxygenated  blood is pumped into the lungs through the pulmonary artery. In the lungs, deoxygenated blood releases its carbon dioxide  and absorb fresh oxygen from the air.



7. Valves present in the both the chamber ensure that the blood does not flow backwards when the atria or ventricles contract.

HUMANS HAVE A DOUBLE CIRCULATORY SYSTEM? WHAT DO YOU MEAN BY THIS?   PLEASE POST, IF YOU REMEMBER….
AND WHY IS IT NECESSARY?

Q- What is double circulatory system? Why it is important for human beings?



DON’T FORGET TO WRITE THIS IN YOUR NOTES

NOW YOU WILL BE ABLE TO ANSWER …


STAY SAFE !!   😊

Comments

  1. AnonymousApril 7, 2020 at 11:14 AM

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    ReplyDelete
  2. Adavya DhirApril 7, 2020 at 11:14 AM

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    Adavya Dhir

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  3. UnknownApril 7, 2020 at 11:15 AM

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    -OJAS GIROTRA

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  18. AnonymousApril 7, 2020 at 11:33 AM

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  19. Eugene SamuelApril 7, 2020 at 11:37 AM

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