Advertisements
Advertisements
Question
Use your brain power!
How is the air that we inhale purified in our body?
Solution
There are tiny, fine hair-like outgrowths called cilia inside the nose from where the air passes inside. Larger dust particles get caught in these hairs. The air going inside the trachea thus gets filtered. There is also a layer of a sticky substance called mucous. The dust and smoke particles stick to the mucous. Thus, the air that we inhale gets purified before it reaches the lungs.
RELATED QUESTIONS
Give reason for the following:
Atrial wall is less muscular than the ventricular wall.
What is haemoglobin? State the consequences of deficiency of haemoglobin in our bodies.
Explain with reasons.
Human blood is red coloured.
Multiple choice questions. Tick ( ✓ ) the correct choice:
The four blood groups in humans are
Complete the following sentence with appropriate word:
The foundations of physiology were laid by the physician __________.
Complete the following sentence with appropriate word:
The chamber of heart which pumps blood into aorta is __________.
Why do we call saliva a digestive juice?
Label the diagram given below to show the four main parts of the urinary system and answer the following questions.
- Which organ removes extra salts and water from the blood?
- Where is the urine stored?
- What is the tube through which urine is excreted out of the body?
- What are the tubes that transfer urine from the kidneys to the urinary bladder called?
Assertion (A): RBCs help in the transport of respiratory gases.
Reason (R): The cytoplasm of RBCs contains the respiratory pigment Haemoglobin.
