Advertisements
Advertisements
प्रश्न
How are the alveoli designed to maximise the exchange of gases?
Advertisements
उत्तर
The terminal of the bronchioles contains the alveoli. These are structures that resemble balloons and are densely packed with blood arteries. Their thin membranes enhance the surface area available for gas exchange.
APPEARS IN
संबंधित प्रश्न
Carbon dioxide enters into the leaves through tiny pores present on the surface of the leaf called _________.
(a) chlorophyll
(b) chloroplast
(c) stomata
(d) epidermis
Why do fishes die when taken out of water?
Draw a labelled diagram of the human respiratory system.
Which of the following statements are true about respiration?
(i) during inhalation, ribs move inward and diaphragm is raised.
(ii) the gaseous exchange takes place in the alveoli.
(iii) haemoglobin has greater affinity for carbon dioxide than oxygen.
(iv) alveoli increase surface area of the exchange of gases
One of the following animals does not use tracheae as the respiratory organs. This animal is:
Out of xylem and phloem, which one carries materials only upwards?
A student has set up "CO2 is released during respiration”. After about 1 hour he observes no change in the water level in the delivery tube. Write two possible resons for the failure of the experiment.
Name the body structure concerned with the given functional activity:
Provides actual diffusion of respiratory gases in the lungs.
Given below is an example of certain structure and its special functional activity:
"Kidney and excretion".
Fill in the blanks on a similar pattern.
Epiglottis and _____________.
Given below is an example of certain structure and its special functional activity:
"Kidney and excretion".
Fill in the blanks on a similar pattern.
Diaphragm and _____________.
Answer the following question.
In the experimental set up to show that "CO2 is given out during respiration", name the substance taken in the small test tube kept in the conical flask. State its function and the consequence of its use.
Draw a diagram of the human respiratory system and label - pharynx, trachea, lungs, diaphragm and alveolar sac on it.
Complete the analogy.
Transport of CO2 by plasma : 7% :: Transport of CO2 by bicarbonate ions: ____________.
____________ is the maximum amount of air that the lungs can hold after a maximum forceful inspiration.
With which of the following haemoglobin combines to form carboxyhaemoglobin?
Which of the following equations is the summary of photosynthesis?
Explain the three pathways of breakdown in living organisms.
Breathing is a process that
- provides O2 to the body.
- breaks down food to release energy.
- helps the body to get rid of CO2.
- produces water in the cells.
Which of the following gives the correct combination of functions of breathing?
Exchange of gases in the leaves takes place with the help of ______.
