Tag: regulation of respiration

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Questions Related to regulation of respiration

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

Forced deep breathing for a few minutes by a person sitting at rest may be
followed by a temporary cessation of breathing. This is due to

  1. Too much $O _2$ in the blood
  2. Too much $CO _2$ in the blood
  3. Very little $CO _2$ in the blood
  4. Both too much $O _2$ and very little $CO _2$ in the blood
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Deep breathing rises the $O _2$ level of the blood. By excess formation of oxyhaemoglobin the acidity of blood increases. To control it, more of free $CO _2$ changes into bicarbonates and the free $CO _2$ level in the blood decreases. So due to lack of stimulant for inspiratory centre cessation of breathing takes place, after some time $O _2$ is consumed by the tissues and rise in $CO _2$ stimulates breathing again. So, the correct answer is 'Both too much O$ _2$ and very little CO$ _2$ in the blood'.

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

When carbon dioxide concentration in blood increases, breathing becomes ............ and ...........

  1. Shallower and slow

  2. Slow and deep

  3. Faster and deeper

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When the concentration of carbon dioxide increases in blood that results in decreasing the affinity of hemoglobin towards oxygen or amount of oxygen is less in blood. To compensate the oxygen amount breathing goes faster and deeper and is known as hyperventilation which is controlled by the medullary respiratory center.

So the correct option is 'Faster and deeper'.

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

Pneumotaxis and inhibitory centers are associated with _______________.

  1. breathing

  2. respiration

  3. digestion

  4. sleeping
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • Regulation of Respiration is done by the nervous mechanism.
  • A specialised centre present in the medulla region of the brain called the respiratory rhythm centre is primarily responsible for this regulation.
  • Another centre is present in the Pons region in the brain called pneumotaxis centre can moderate the function of Respiratory Rhythm Centre.
Hence, the correct answer is 'Breathing'

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

Respiratory rhythm centre is present:-

  1. Cerebrum

  2. Cerebellum

  3. Medulla

  4. Pons
Reveal answer Fill a bubble to check yourself
C,D Correct answer
Explanation
  • The respiratory center is located in the medulla oblongata and pons, in the brainstem.
  • The respiratory center is made up of three major respiratory groups of neurons, two in the medulla and one in the pons. It is responsible for generating and maintaining the rhythm of respiration.
  • Hence Respiratory rhythm center is present Medulla and pons.
  • So, the correct answer is 'Medulla and Pons.
Multiple choice bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

The respiratory centre of the brain is located in 

  1. Medulla oblongata

  2. Pons

  3. Cerebellum

  4. Cerebrum
Reveal answer Fill a bubble to check yourself
A,B Correct answer
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.

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

A condition of over breathing is called as

  1. Hyperventilation

  2. Hypoventilation

  3. Hypoxia

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

Which of the following is the peripheral chemoreceptor?

  1. Aoritic body

  2. Carotid body

  3. Both A and B

  4. Spinal nerve
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.
Multiple choice bio-chemistry cell membrane regulation of respiration transport of respiratory gases buffer and its role

Steps of respiration are controlled by

  1. Substrates

  2. Enzymes

  3. Hormone

  4. Bile juice
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

Breathing is controlled by

  1. Lungs

  2. Trachea

  3. Medulla oblongata

  4. Hypothalamus
Reveal answer Fill a bubble to check yourself
C Correct answer
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.