Tag: evs

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Questions Related to evs

Multiple choice evs respiration in organism respiration in humans mechanism of respiration in animals human lungs

Which of the following is true for $CO _2$ concentration ?

  1. More in alveolar air than in expired air

  2. More in expired air than in alveolar air

  3. More in inspired air than in alveolar air

  4. More in inspired air than in expired air
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The concentration of expired air is more in the alveolar air than in expired air due to the partial pressure of carbon dioxide in alveoli is more than the atmosphere.

So the correct option is 'More in alveolar air than in expired air'

Multiple choice evs respiration in organism respiration in humans mechanism of respiration in animals human lungs

Hiccough (hiccup) is due to activity of

  1. Intercostal muscle

  2. Food in air tract

  3. Diaphragm

  4. Inadequate oxygen in environment
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • Hiccup is also called as a hiccough. It is an involuntary activity of the diaphragm. During hiccups, the diaphragm muscle shows several involuntary contractions. 
  • When the diaphragm muscle contracts, the opening between the vocal cords snaps shut to check the inflow of air. 
  • This results in the hic or hiccup sound. This results due to irritation of the nerves. 

Thus, the correct answer is 'Diaphragm.'

Multiple choice evs respiration in organism respiration in humans mechanism of respiration in animals human lungs

The diaphragm contracts, resulting in inhalation as the volume of thoracic cavity

  1. Decreases in anteroposterior axis

  2. Decreases in dorsoventral axis

  3. Increases in dorsoventral axis

  4. Increases in anteroposterior axis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During inhalation, the contraction of the diaphragm and external intercostal muscles increases the volume of the thoracic chamber. Specifically, the contraction of the dome-shaped diaphragm increases the volume along the anteroposterior axis, while rib elevation increases the dorsoventral axis.

Multiple choice evs respiration in organism respiration in humans mechanism of respiration in animals human lungs respiration in human beings respiratory organs in humans

Which of the following changes occur in diaphragm and intercoastal muscles when expiration of air takes place?

  1. External intercostal muscles relax and diaphragm contracts

  2. External intercostal muscles contracts and diaphragm relaxes

  3. External intercostal muscles and diaphragm relaxes

  4. External intercostal muscles and diaphragm contracts
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice evs respiration in organism respiration in humans mechanism of respiration in animals human lungs respiration in human beings respiratory organs in humans

The respiratory centre leading to faster breathing is on account of ________________.

  1. Venous blood entering the respiratory centre

  2. Arterial blood entering respiratory

  3. Venous blood leaving the respiratory centre

  4. Arterial blood leaving the respiratory centre
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The medulla oblongata is the primary respiratory control centre. Its main function is to send signals to the muscles that control respiration to cause breathing to occur. The respiratory control centre increase respiratory rate on the account of decrease in blood pH, as the oxygenated blood through veins enter the system, decrease in $CO _2$ levels, increased respiratory rate.

Multiple choice evs solar energy fuels and fossil fuels solar energy and its applications electric energy generation and environment

Coke is more valuable when used:

  1. as a fuel for industrial boilers

  2. as an oxidising agent

  3. as a reducing agent

  4. as a fuel in domestic ovens
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Coke is majorly used in the extraction of the metals from their ores. It is used as a reducing agent. Hence, coke is more valuable in metal extraction industry, when used as a reducing agent.