Tag: the mechanism of breathing

Questions Related to the mechanism of breathing

Which component from the inhaled air is used by the body?

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Carbon dioxide

  2. Nitrogen

  3. Oxygen

  4. Hydrogen

Show answer
Correct Option: C
Explanation:
Inhalation (breath in) and exhalation (breath out) is a part of respiration. During inhalation oxygen is inhaled with air as major component which plays key role in metabolism.
So the correct answer is 'Oxygen'.

Which of the following is considered to be a breath

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. 2 inhalation + 2 exhalation

  2. 1 inhalation + 2 exhalation

  3. 2 inhalation + 1 exhalation

  4. 1 inhalation + 1 exhalation

Show answer
Correct Option: D
Explanation:
The number of times a person breath is called breathing rate. A breath consists of one exhalation and one inhalation. Inhalation involves the breath in the air while exhalation involves the breath out the air.
So the correct answer is '1 inhalation + 1 exhalation'.

The breathing rate of an adult at exercise and rest respectively will be 

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. 25 and 18 times per minute

  2. 18 and 25 times per minute

  3. 35 and 28 times per minute

  4. 28 and 35 times per minute

Show answer
Correct Option: A
Explanation:
Respiratory rate or breathing rate of a person increases with increasing physical activity. The normal breathing rate of an adult is 12-20 breathes per minute. But it is counted to be more than 20 breathes during exercise and less than 20 breathes at rest of the body.
So the correct answer is '25 and 18 times per minute'.

The size of the chest cavity increases during inhalation.

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. True

  2. False

Show answer
Correct Option: A
Explanation:
  • When you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. This increases the space in your chest cavity, into which your lungs expand. The intercostal muscles between your ribs also help enlarge the chest cavity. They contract to pull your rib cage both upward and outward when you inhale.
  • Hence the size of the chest cavity increases during inhalation is a true statement.
  • So, the correct answer is 'True'.

During heavy exercise the breathing rate of a person slows down.

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

During exercise, the muscle cells need more oxygen to sustain their work This results in an increase in breathing and heart rate because both the lungs and the heart work extra to keep up with the ever growing need of oxygen.

Fermentation takes place in the muscle cells during exercise which results in an increase in the amount of lactic acid, hydrogen ion. This stimulates the respiratory system more and it results in an increase in the heart rate so that the heart pumps more blood. The blood pressure increase which leads to more blood flow in the alveoli.
The lungs absorb more oxygen and the muscle cells receive more blood and thus the oxygen demand is satisfied.
Therefore this statement is false.

Normal range of breathing rate per minute in an average adult person at rest is.

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. $9-12$

  2. $15-18$

  3. $21-24$

  4. $30-33$

Show answer
Correct Option: B
Explanation:
  • Breathing (or ventilation) is the process of moving air into and out of the lungs to facilitate gas exchange with the internal environment, mostly by bringing in oxygen and flushing out carbon dioxide.
  • The Normal range of breathing rate per minute in an average adult person at rest is 15-18.
  • So, the correct answer is '15-18'.

During running or cycling ,Which of the following organs have to increase their activity

biology respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Heart

  2. Lungs

  3. Both (1) and (2)

  4. Kidneys

Show answer
Correct Option: C
Explanation:

During any physical exercise such as running or cycling the two vital organs of our body heart and lungs come into action since lung try to bring oxygen into the body to provide energy and side by side removing carbon dioxide formed by strenuous physical activity. While the heart pumps oxygen-rich blood to skeletal muscle undergoing physical exercise to meet their metabolic requirements.

Thus, the correct answer is  'Both (1)-Heart and (2)-Lungs'.

When there is a decrease in the concentration of oxygen in the blood, the rate of breathing

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Does not change

  2. Increases

  3. Decreases

  4. Increases or decreases depending on the density of blood

Show answer
Correct Option: B
Explanation:

Blood that is low in oxygen concentration and high in carbon dioxide. The rate of diffusion of a gas is proportional to its partial pressure within the total gas mixture. The lungs are never completely empty: There is always some air left in the lungs . At high altitudes, Patm decreases but concentration does not change. So, the correct option is "B" (Increases).

When $CO _{2}$ concentration in blood increases, breathing becomes.

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. There is no effect on breathing

  2. Slow and deep

  3. Faster

  4. Shallower and slow

Show answer
Correct Option: B

Microscopic pores in plants through which they expire air are called

biology respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Stigma

  2. Thalamus

  3. Gills

  4. Stomata

Show answer
Correct Option: D
Explanation:
A.Stigma - the terminal part of the gynoecium is called stigma.
B.Thalamus - The upper exapanded structure present at the tip of the pedicle.
C.Gills - the paired respiratory organ of fish and some amphibians, by which oxygen in extracted from water flowing over surfaces within or attached to the walls of the pharynx.
 D.stomata - minute pores present on the epidermis of aerial organs meant for transpiration
So, the correct option is 'stomata'.