Tag: transport of respiratory gases

Questions Related to transport of respiratory gases

The respiratory centre of the brain is located in 

bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

  1. Medulla oblongata

  2. Pons

  3. Cerebellum

  4. Cerebrum

Show answer
Correct Option: A,B
Explanation:

Respiratory centres generate rhythmic pattern of breathing and are present in brain stem. The medullary respiratory centres constitute the primary respiratory centre and include two aggregates of neuronal cell bodies namely dorsal respiratory group and ventral respiratory group. They serve to provide output to respiratory muscles. Pontine respiratory centres are present in higher in brain stem in pons and are namely pneumotaxic centre and apneustic centre. Pontine respiratory centres modify the output from medullary centres.

Cerebellum serves to coordinate the voluntary movements of skeletal muscles as well as posture, balance and equilibrium. Cerebrum is the largest and uppermost division of brain.
It is the centre for higher thought processes required for learning, memory, language and speech. 
Therefore, the correct answer is option A and B.

A condition of over breathing is called as

bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

  1. Hyperventilation

  2. Hypoventilation

  3. Hypoxia

  4. None of the above

Show answer
Correct Option: A
Explanation:
Hyperventilation is a process of quick and deep breathing in which there is more exhalation than inhalation. This leads to reduced concentration of carbon dioxide dissolved in the blood also called hypocapnia.
So, the correct answer is 'Hyperventilation'.

Which of the following is the peripheral chemoreceptor?

bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

  1. Aoritic body

  2. Carotid body

  3. Both A and B

  4. Spinal nerve

Show answer
Correct Option: C
Explanation:
Peripheral chemoreceptors are made up of aortic and carotid bodies. Aortic body control the changes in blood oxygen and carbon dioxide. But carotid body detects changes in pH along with O$ _2$ and CO$ _2$.
So the correct answer is 'Both A and B'.

Steps of respiration are controlled by

bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

  1. Substrates

  2. Enzymes

  3. Hormone

  4. Bile juice

Show answer
Correct Option: B
Explanation:

  •  Cellular respiration is the process by which cells convert glucose into carbon dioxide and water. 
  • Cellular respiration takes place in three steps: glycolysis, the citric acid cycle and oxidative phosphorylation.
  • The main role of enzymes during the respiration reaction is to assist in transferring electrons from one molecule to another. e.g. In glycolysis, the enzyme dehydrogenase is used. Hence, the steps of respiration are controlled by enzymes.
So, the correct answer is  'enzymes'.

Breathing is controlled by

bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

  1. Lungs

  2. Trachea

  3. Medulla oblongata

  4. Hypothalamus

Show answer
Correct Option: C
Explanation:

The medulla oblongata is the lower half of the brainstem, which is continuous with the spinal cord, the upper half being the pons. The medulla contains the cardiac, respiratory, vomiting and vasomotor centres and therefore deals with the autonomic (involuntary) functions of breathing, heart rate, and blood pressure.

Pneumotaxic centre occurs in.

bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

  1. Cerebellum

  2. Cerebrum

  3. Medulla oblongata

  4. Pons varolii

Show answer
Correct Option: D

The pneumotoxic and respiratory rhythm centres are respectively present in.

bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

  1. Pons and medulla oblongata

  2. Corpus callosum and pons

  3. Medulla oblongata and hypothalamus

  4. Diencephalon and pons

Show answer
Correct Option: A

Each $100$ml of human arterial blood carries 'P' ml of $O _2$ and 'Q' ml of $CO _2$ whereas each $100$ml of venous blood carries 'R' ml of $O _2$ and 'S' ml of $CO _2$. Choose the correct values of P, Q, R and S.

bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

  1. P-$48$ml, Q-$19$ to $20$ml, R-$52$ml, S-$14$ to $15$ml

  2. P-$19$ to $20$ml, Q-$48$ml, R-$14$ to $15$ml, S-$52$ml

  3. P-$14$ to $15$ml, Q-$52$ml, R-$19$ml to $20$ml, S-$48$ml

  4. P-$52$ml, Q-$14$ to $15$ml, R-$48$ml, S-$19$ to $20$ml

Show answer
Correct Option: B

What is $pO _2$ and $pCO _2$ in synthematic arteries?

bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

  1. $pO _2$ $40$mm Hg, $pCO _2$ $45$mm Hg

  2. $pO _2$ $95$mm Hg, $pCO _2$ $104$mm Hg

  3. $pO _2$ $95$mm Hg, $pCO _2$ $40$mm Hg

  4. $pO _2$ $45$mm Hg, $pCO _2$ $40$mm Hg

  5. $pO _2$ $104$mm Hg, $pCO _2$ $159$mm Hg

Show answer
Correct Option: C

Assertion :

Inspiration occurs due to muscular relaxation.



Reason : During

inspiration, ihe diaphragm and external iniercostal muscle contract

simultaneously






bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true

Show answer
Correct Option: E
Explanation:

(e) Inspiration is the result of muscular contraction. The diaphragm and external intercostal muscle contracts simultaneously. The lateral thoracic wall moves outward and upward.