Tag: respiratory cycle

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Multiple choice zoology respiratory system of human mechanism of respiration respiratory cycle breathing and exchange of gas

During inspiration.

  1. Diaphragm and external intercostal muscles relax

  2. Diaphragm and internal intercostal muscles relax

  3. Diaphragm and external intercostal muscles contract

  4. Diaphragm and internal intercostal muscles contract
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Inspiration is an active process involving the contraction of the diaphragm (moving downward) and the external intercostal muscles (lifting the ribs).

Multiple choice zoology respiratory system of human mechanism of respiration respiratory cycle breathing and exchange of gas

Which is correct?

  1. During inspiration, external intercostal muscles and diaphragm contract

  2. Cyanosis means collapse of alveoli

  3. Eupnoea is slow breathing

  4. Coryza is caused by human corona virus
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Option A correctly describes the active phase of breathing. The other options are incorrect: cyanosis is a bluish discoloration due to low oxygen, eupnoea is normal breathing, and coryza is typically caused by rhinoviruses.

Multiple choice zoology respiratory system of human mechanism of respiration respiratory cycle breathing and exchange of gas

Read the following statements regarding mechanism of respiration and choose the correct option.
$1$. Inspiration occurs only when there is negative pressure in the lungs with respect to atmosphere
$2$. Expiration takes place only when intrapulmonary pressure is lower than atmospheric pressure
$3$. Pressure gradients are generated with the help of diaphragm and intercostal muscles
$4$. Inspiration is initiated by relaxation of diaphragm
$5$. Contraction of diaphragm reduces pulmonary volume and increases intrapulmonary pressure causing expiration.

  1. $1, 2$ and $5$ correct
  2. $2$ only correct
  3. $2, 5$ correct
  4. $1, 3$ correct
  5. $1, 4$ correct
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Statement 1 is correct (negative pressure is required). Statement 3 is correct (muscles create the pressure gradient). Statements 2, 4, and 5 are incorrect because expiration is passive (relaxation) and contraction of the diaphragm increases volume, not reduces it.

Multiple choice zoology respiratory system of human mechanism of respiration respiratory cycle breathing and exchange of gas

With conscious efforts one can.

  1. Breathe out air totally without oxygen

  2. Breathe in and out by moving diaphragm alone without moving ribs at all

  3. Breathe out air through eustachian tube by closing both nose and mouth

  4. Empty the lungs completely by breathing out all air out of them
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The diaphragm and intercostal muscles are skeletal muscles, allowing for some conscious control. One can choose to breathe using only the diaphragm (abdominal breathing) or only the ribs (thoracic breathing).

Multiple choice zoology respiratory system of human mechanism of respiration respiratory cycle breathing and exchange of gas

Which of the following is the most appropriate in normal circumstances?

  1. During inspiration the intrapulmonary pressure is less than the atmospheric pressure

  2. During expiration the intrapulmonary pressure is less than the atmospheric pressure

  3. During inspiration the intrapulmonary pressure is more than the atmospheric pressure

  4. During expiration the intrapulmonary pressure is equal to atmospheric pressure
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

For air to flow into the lungs during inspiration, the intrapulmonary pressure must be lower than the atmospheric pressure, creating a pressure gradient.