Life Processes- Respiration Blog 2



LIFE PROCESSES   (CLASS 10)



Welcome back students!   😊😊

I HOPE EACH ONE OF YOU IS SPENDING TIME FRUITFULLY.
I ALSO HOPE YOU HAVE READ THE CHAPTER LIFE PROCESSES TILL THE PORTION DONE WITH YOU IN THE PREVIOUS CLASS.   👀
  
  By the end of today’s class, the learners will be able to

1)    List the characteristics of a respiratory surface.
2)    Trace the path of oxygen into the respiratory tract.
3)    State the importance of haemoglobin.
4)    Justify that respiration is an essential process.
5)    Study respiration in plants.

PLEASE COPY EVERYTHING IN YOUR BIOLOGY NOTEBOOK THAT IS WRITTEN IN RED. KEEP YOUR NCERT WITH YOU FOR ANY REFERENCE.

       https://youtu.be/zS2rea65hw4     WATCH THE VIDEO FOR     

           RESPIRATION IN PLANTS👆

The plant s exchanges gases through stomata, and the large inter-cellular spaces ensure that all cells are in contact with air. Carbon dioxide and oxygen are exchanged by diffusion. They can go into cells or away from them and out into the air. 

 The direction of diffusion depends upon (i) Environmental conditions (ii) Requirements of the plants.
During night, when there is no photosynthesis occurring, CO2 elimination is the major exchange activity going on. During the day, CO2 generated during respiration is used up for photosynthesis, hence there is no CO2 release. In this case Oxygen is the major event at this event.


WATCH THE VIDEO  👆


                                    RESPIRATION IN ANIMALS

Different animals evolved different organs for the uptake of oxygen the environment and for getting rid of the carbon dioxide produced. Terrestrial animals can breathe the oxygen in the atmosphere but animals like fish and prawn need to use oxygen dissolved in water.

 Q- Why does the breathing rate of aquatic animals is faster than the terrestrial animals?
A- The amount of dissolved oxygen is fairly low compared to the amount of oxygen in the air, the rate of breathing in aquatic organism is much faster than that seen in terrestrial organisms. Fishes take in water through their mouths and force it past the gills where the dissolved oxygen is taken up by blood.

YOU WILL NOW BE ABLE TO ANSWER WHY RATE OF BREATHING IN AQUATIC ORGANISMS IS FASTER THAN THAT SEEN IN TERRESTRIAL ORGANISMS? 

                                              RESPIRATION IN HIGHER ANIMALS
 We have discussed about respiration in human in the previous blog now let us all see some important points in this blog.

 1. Residual Volume of Air: During the breathing cycle, when air is taken in and let our, the lungs always contain a residual volume of air so that there is sufficient time for oxygen to be absorbed and for the carbon dioxide to be absorbed and for the carbon dioxide to be released.

 2. Respiratory Pigment: When the body size of animals is large, the diffusion pressure alone cannot taken take of oxygen delivery to all parts of the body. Instead, respiratory pigment take up oxygen for the air in the lungs and carry it to tissues which are deficient in oxygen before releasing it. 

 In human beings, the respiratory pigment is haemoglobin which has a very high affinity for oxygen. This pigment is present in the RBC's. Carbon dioxide is more soluble in water than oxygen is and hence is mostly transported in the dissolved form in our blood.

CHARACTERISTICS OF ALL RESPIRATORY SURFACES    (COPY THE FOUR POINTS LISTED BELOW)

              https://youtu.be/TxoB6A8d4-8     👈This video explains respiratory system and how                 oxygen is carried in our body

           https://youtu.be/GjfD55C9v38    👈MECHANISM OF RESPIRATION
              
     AFTER WATCHING THE TWO VIDEOS, I HOPE YOU WILL BE ABLE TO      ANSWER THE FOLLOWING QUESTIONS:

 If you have any doubt, just feel free to write in the comment box

ASSIGNMENT

Q1) How is oxygen and carbon dioxide transported in human beings?

Q2) How are the lungs designed in humans to maximize the area for exchange of gases?

Q3)Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans?

Q4) What is residual volume of air?

Q5) Why is the nasal passage lined with mucus and fine hair?

Q6) Why is trachea made of rings of cartilage?

Read pages 102, 103 and 104 NCERT.

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