Grade 11 Process of respiration

Respiration is the process of .......................of simple foods within living cells.

Respiration in a human is a complex process and it occurs in three stages. They are,

• Gas exchange between external environment and lungs

• Gas exchange in alveoli

• Inspiration

• Cellular respiration

What is the process demonstrated by the model?

• Inspiration

• Expiration

Main parts of respiratory system are nasal cavity, pharynx, larynx, ..........................., bronchi, bronchioles and alveoli

Internal surface of nasal cavity is covered with. ..................

The bacteria, dust and other wastes found in inhaled air stick onto this.

There are numerous .....................present on the lining of the nasal cavity. By rhythmic movement of them the waste materials are sent out.

The changes that take place when inhaled air passes through the nasal cavity are

• Moisturizing

• Gas exchange into the lungs

• Warming up of inhaled air up to body temperature

• Removal of foreign matter from inhaled air

Lungs are present in thoracic cavity. Thorasic cavity is protected by ............

During inspiration, air enters into lungs. For that, the volume of the lungs should increase. To increase the volume of the lungs, volume of the thoracic cavity should be increased. This occurs due to following changes. Inter-costal muscles contract, therefore ribs move up and sternum moves forward. At the same time the ..............................................contracts and reduce its curvature. Due to above activities the volume of the thoracic cavity increases and with that volume of lungs increase. So air enter into lungs through the nose

The respiratory surface of human is the ............................

• Wall of alveoli

• Lungs

• Pharynx

• Larynx