The inner cells of leaves are called

The swelling of tubular walls and narrowing of tubes is

In animals and human beings, the lungs and the air passageway are two important parts of

Which of the following is the human breathing rate at rest?

Which of the following is the respiratory surface in human beings?

The destruction of walls of the alveoli is

The epiglottis, a flap of tissues covers the

The pair of ribs in the chest wall are

Amount of oxygen in inspired air is 21 % and in expired air is

The fine ends of the bronchioles are known as

The infection of lungs is called

How many types of bronchitis are?

The process through which animals take oxygen (O₂) from the air and release carbon dioxide (CO₂) into the air is called

The smaller tubes within the chest cavity having cartilaginous plates called

Intercostal muscles are present in

Respiration involves the mechanical and

The larynx a box is made up of

The process through which organisms get oxygen for their cells from their surrounding environment is classified as

In the air passageway, the incoming air passes from the pharynx to the

In the chest wall, the rib muscles are considered as

A muscular passage that is common to both food and air is called

In nostrils, the substance which moistens and keep the incoming air warm is classified as

During inspiration the diaphragm is

The main cause of lung cancer is

The most common cause of cancer-related deaths is

The cluster of pouches opened from alveolar ducts is called

Human breathing rate during hard physical work is

The right lung is bigger than the left lung with

The bronchi divide into the lungs and make fine tubes that are known as

The respiratory disorder in which cells division takes place without any control and causes tumors is called