Respiration in Humans

Q.

Explain the mechanism of breathing in human beings.

Q.

Where is the respiratory membrane located?

Q. What is pulmonary respiration?

Q.

How do alveoli adapt to their function?

Q. Why do our heart rate increases when we run

Q.

Question 11
On an average, an adult human being at rest breathes 15–18 times per minute. The breathing rate, however, may differ under different conditions. Arrange the following activities given in the box in order of increasing breathing rates and give reason for your answer.

sleeping, cycling, brisk walk, watching TV

Q. Choose the correct match regarding organisms and their respiratory organ.

1. Frog: Skin
2. Earthworm: Skin
3. Rose plant: Stomata
4. Birds: Feathers

Q.

The structure which prevents the entry of food into respiratory tract is:

1. Pharynx

2. Glottis

3. Epiglottis

4. Larynx

Q.

The diagram given below is a microscopic structure of intestinal villi. Identify A, B and C.

1. A. Lacteal, B. Artery and C. Capillaries

2. A. Capillaries, B. Lacteal and C. Artery

3. A. Artery, B. Lacteal and C. Capillaries

4. A. Capillaries, B. Artery and C. Lacteal

Q.

What happens during inhalation and exhalation

Q.

Name the muscular sheet which separates the abdomen from the chest cavity. What is its function? [2 MARKS]

Q.

How do respiration takes place in humans?

Q.

When you exercise vigorously a rate of breathing increases, why?

Option 1 : the supply more oxygen to cells to release more energy

Option 2 : to remove the lactic acid formed

Option 3 : to increase the heartbeat

Option 4: to expand and contract the lungs

Q.

When the breakdown of glucose occurs without the use of oxygen, it is called __________ (aerobic/anaerobic)

Q.

What is the function of lungs?

1. Exchange of oxygen and carbon dioxide between air and the body

2. Exchange of water between body and air.

3. Absorption of Nutrients from food

4. None of the above

Q.

Which part of the root is involved in the exchange of respiratory gases?

Q.

Does the process of glycolysis occur in humans?

Q.

Epiglottis guards the opening of:

1. Internal nares

2. Oesophagus

3. Eustachian tubes

4. Larynx

Q.

Why do we sneeze when we inhale a lot of dust-laden air? [3 MARKS]

Q.

1) how do you think you would be affected if the surface area of your lungs was reduced?

Q. The process of breathing out of air rich in carbon dioxide is called as .

1. exhalation
2. inhalation
3. inspiration

Q.

Define the following:
Breathing

Q.

The diaphragm is characteristic of

1. Mammals

2. Reptiles

3. Birds

4. All vertebrate

Q.

The narrowest and most numberous tubes of lungs are termed as

1. Bronchioles

2. Alveoli

3. None of these

4. Bronchus

Q.

What are the blood vessels that connect arteries to veins called?

Q.

During the process of photosynthesis oxygen gas released comes out

1. from ${\mathrm{CO}}_2$

2. by splitting water

3. from glucose

4. from atmospheric air

Q. Explain transport and excretion?

Q.

What do you mean by being alive?

Q.

What happens to the air breathed in, once it reaches the lungs?

Q.

Which energy is consumed while breathing?

1. Mechanical

2. Physical

3. Chemical

4. Bioelectrical